Friday, 30 December 2022

MODEL TEST PAPER -4 (CHEMISTRY)

₀ ₁ ₂ ₃ ₄ ₅ ₆ ₇ ₈ ₉

Time: 1 Hour 30 Mins.          F.M-40 

Attempt all questions from Section A and any three questions from Section B 


                  SECTION A 

            (Attempt all questions) 

Question 1.                                   (10

Write the correct option only 

i) Carbon reduction is not used for the extraction of--- 

A) Fe B) Na C) Zn D) Pb 

ii) Roasting is a process of a heating--- 

A) In presence of air B) In absence of air C) In presence of a water D) In absence of water 

iii) Froth floatation is used the concentration of--- 

A) oxide ore B) carbonate ore C) Sulphide ores D) chloride ore 

iv) Nichrome is made up of -- 

A) Cu + Zn+ Al B) Ni + Fe+ CR C) Pb+ Sn+ SB D) Na+ Hg + Cu 

v) The aim of the Fountain experiment is -- 

A) HCl is denser than air B) HCl turns blue litmus red C) HCl is highly soluble water D) HCl fumes in moisture air 

vi) The chemical used in the brown ring test is -- 

A) CuSO₄ B) ZnSO₄ C) Fe₂(SO₄)₃ D) FeSO₄ 

vii) Carbon to Carbon double bond is found in-- 

A) Acetaldehyde B) Acetic Acid C) Ethyl alcohol D) 2-butylene

vii) The gas evolved when dilute sulphuric acid reacts with iron sulphide --- 

A) Sulphur Dioxide B) Nitrogen dioxide C) carbon dioxide D) hydrogen Sulphide 

ix) Which one of the following has maximum boiling point--- 

A) Ethane B) Propane C) Butane D) Pentane 

x) IUPAC name of the following compound is-- 

                CH₃ 

                  | 

     CH₃--- CH --- CH₂--- OH is 

A) 2 methyle propane -3 -ol  

B) 2 - 2 dimethyl butanol 

C) 2 methyl propane - 1 - ol 

D) 3 methyle propane -1 - ol 


              SECTION - B 

(attempt any three question from this section)

Question 2.

i) Write cathode and anode reaction for extraction of aluminium in Hall- Heroults process.                       (2)

ii) Select the correct answer from the brackets to complete the following statements.                (2)

a) Zinc blend is converted to oxide by ___(roasting/calcination) process.

b) The catalyst used in the oxidation of ammonia is ____(zinc/ Platinum).

iii) A substance 'A' was heated with slaked lume, a gas B obtained with a pungent smell. Name the substance A and B and write the balanced equation.                   (3)

iv) What is a Aqua regia ? Write the reaction how it give soluble chloride ?                                                   (3)

 Question 3.

i) Define pulverization and calcination.                                 (2)

ii) Name the compound formed when :

   a) When Ammonia and hydrochloric gas react.

  b) Ethane react with hydrogen in presence of platinum catalyst.

iii) Write the chemical equation for the preparation of NH₃ in laboratory ? Why H₂SO₄ is not used as a drying agent for NH₃.                               (3)

iv) Name the following organic compound.                                    (3)

a) The first homologous whose  general formula is CₙH₂ₙ.

b) The compound formed by complete chlorination of ethyne.

c) When 1-2 dibromoethane is boiled with alcoholic KOH which product is formed.


Question 4.

i) Write two ores of Almunium.   (2)

ii) Name one alloy that contains Almunium.

iii) Identify the terms for the following:.                                     (3)

 a) The electrodes where oxidation takes place.

 b) The process by which crude metal is purified.

 c) A method used to collect HCl gas.

iv) Complete the table given below: (3)

Name-process  reactant     product

a) ____.        oleum+H₂O         H₂SO₄ 

b) ___   Nitrogen+ H₂             ____

              Tem-450°

             pressure -200atms

           Catalyst Fe & Mo 

Question 4

i) a) Which product is formed when HCL and NH₃ react together?

 b) What is the change of CuO takes place when NH₃ gas is passed through over heated CuO?          (2)

ii) Write the IUPAC nomenculture of the following compounds 

a)     CH₃--CH--CH₂--CH--CH₂--CH₃

                    |                | 

                   Br             Cl 

  

        

             O

             ||                 

b) CH--C--CH₂--CH₂--- CH₃.            (2) 

iii) Write the formula of the product: (3)

 a) C₂H₅Br + KOH(aq)---> 

 b)  C₂ = C₂ + HBr --->   

 c) CH₂ = CH₂  (alkaline)(KMnO₄)-->  

iv) Name the hydrocarbon which is:

a) tetrahedral molecule.

b) A planer molecule.

c) a linear molecule.                    (3)

Question 6.

i) Write two isomers of the compound with molecular formula C₂H₆O.                                            (2)

ii) What is the general formula of alkene and write the name of smallest alkalane ?                      (2)

iii) Write the balanced equation for the following conversions:

 a) When Ammonium Nitrate is heated ?

 b) When hydrogen Sulphide react with sulphuric acid ?

 c) methanol is heated with con.H₂SO₄ at 170°C                      (3)

iv) Compound A is bubbled through bromine dissolved in carbon tetrachloride and the product is CH₂Br ---CH₂Br 

      Br₂CCl₄

 A -----------> CH₂--Br--CH₂--Br 

 a) Draw the structural formula of A ?

  b) What type of reacts has A undergone ? 

 c) What will you observe ?         (3)

Monday, 19 December 2022

QUICK REVISION CHEMISTRY

FILL IN THE BLANKS

1) The serial number of an element in the Periodic table is also its____ (atomic number/ mass number)

2) The metallic character___ in a Group as one moves from top to bottom.( increases/ decreases)

3) The metallic character___ in a period as one moves from left right.(increases/decreases)

4) ____is the most active non metal.(chlorine/iodine)

5) ___ is the most active metal (magnesium/Sodium)

6) An increase in nuclear charge ___ the tendency of an atom to accept electrons. (increases/ decreases)

7) The atomic size ___as one moves from left to right across a period (increase/ decreases)

8) The elements in a Group VIIA which is a liquid at room temperature is ___(F/Cl/Br)

9) Nuclear charge of an atom is the ____Negative/positive) charge on the nucleus of an atom equivalent to the atomic__ (number/mass)of an atom.

10) Atomic size of neon is___ than the atomic size of chlorine. (more/ less)

11) With increase to nuclear change the nuclear attraction for outer electron ____(increases/ decreases). Hence Ionisation potential.(increases/ decreases)

12) If an element has one electron in its outermost shell, then it is likely to be___(non metallic/ metallic)

13) The properties of elements are periodic functions of their___ (atomic numbers/mass numbers)

14) The elements below the sodium in the same Group would be expected to have a ___(lower/ higher) electronegativity than Sodium and the element above chlorine would be the expected to have a___(lower/higher) Ionisation potential than chlorine.

15) On moving from left to right in a given Period, the number of shells__(remains the same/increases/decreases)

16) On moving down a Group, the number of valence electros____ (remains the same/increases/decreases)

17) Two chlorine atoms combine to form a molecule. The bond between them is ___(ionic/ covalent)

18) In forming oxygen molecule,_ electrons are shared by each atom of Oxygen. (Two/three)

19) The number of single covalent bonds in a C₂H₂ molecules are___ (2/1)

20) Jn forming N₂ molecule, ____ electrons are shared by each atoms of Nitrogen. (3/2)

21) Two atoms of the same element combine to form a molecule. The bond between them is known as ___(ionic/covalent)

22) Methane is a ___compound. (covalent/ionic)

23) CCl₄ is a ___compound. (covalent/ ionic)

24) Halogens have a tendency to ___ electron readily. (lose/gain)

25) ___ is a process by which electrons are apparently removed from an atom or an ion. (Oxidation/reduction)

26) An oxidizing agent is___ of electrons (an accepter/a donor)

27) ____ compounds undergo ionic reactions. (Electrovalent/ covalent)

28) A ____bond is a pair of electrons shared by two atoms. (Ionic/covalent)

29) The bond in the hydrogen molecule is called a___ bond. (single/double)

30) A covalent bond that is shared equally between two bonded atoms is called a ___ covalent bond(polar/nonpolar).

31) The ability of an atom to attract shared electrons is called its ___.(electropositivity/ electronegativity)

32) A reaction between a base and an acid in their solutions to produce salts and water only is called ___reaction. (double decomposition/neutralisation)

33) All nitrates of metals are___. (soluble/insoluble)

34) Sodium chloride is __salt. (a hydrated/an anhydrous)

35) Chemical name of washing soda is ____.(sodium carbonate/ Sodium Sulphate)

36) sodium potassium sulphate is a _____.(Complex salt/mixed salt)

37) The number of replaceable Hydroxide ions formed by one molecule of a base in water is known as ____.(acidity/basicity)

38) An acid used to remove ink stains is ___.(citric acid/oxalic acid)

39) ammonium chloride is a soluble salt prepared by ___. (precipitation/neutralization)

40) The formula Sodium plumbate is______.

41) The colour of hydrated zinc sulphate is ____.(blue/white)

42. On adding aqueous solution of Ammonium hydroxide to ferric chloride. a ____colour precipitate of ferric chloride is formed. (reddish brown/sky blue)

43. The valency of Copper in copper sulphate is ___.(1/2)

44. zinc chloride solution reacts with caustic soda solution to give 8___ colored participate. (Red/white)
45. The salt of lead, soluble in hot water and in cold water is____. (Lead sulphate/lead chooride)

46. Powdered sodium chloride (common salt) does not conduct electric current. but it does so when dissolved in____.(alcohol/ water)

47. During electrolysis, ___ions move towards the cathode. (positive/negative)

48) In an electrolytic cell__ energy is consumed. (mechanical/ Electrical)

49) NaCl is a poor conductor of electricity in ____state. (molten/ solid)

50) Conducting nature of______ compound is due to free ions. (ionic/covalent)

51) Substances which conduct electricity in the solid state are generally___. (Metals/non metals)

52) The electron releasing tendency of zinc is ___thsn that of copper. (less/more)

53) The conductivity of an electrolyte ____with rise in temperature. (decreases/ increases)

54) During electrolysis of copper chloride___ is deposited at the cathode. (copper/chlorine)

55) cations are ___charged ions. (negatively/positively)

56) According to ionic theory the number of Ions___ with dilution in weak electrolytes (increases/ decreases)

57) _____ is a weak electrolyte as well as weak acid. (CH₃COOH/NH₄OH).

58) Fe + CuCl₂ ---> Cu+ ___.(FeC₃/FeCl₂

59) Pure water consists almost entirely of___ (Ions/ molecules)

60) We can expect that Pure water ___normally conduct electricity. (Will/will not (

61) As we descend the electrochemical series containing cations to get ___ at the cathode increases. (Oxidised/reduced)

62) The ___ the concentration of an ion in a solution, the greater is the probability of its being discharged at its appropriate electrode. (Higher/lower)

63) The metal plate through which an electric current enters into an electrolyte is called___. it has ___ of electrons.

64) A base as an electrovalent compound which when dissolved in water, dissociates into a positively charged____ ion and negatively charged___ Ion.

65) the ions which discharge on the negative electrode during electrolysis ___electrons and are called____.

66) In electrorefining of copper___ is deposited at the cathode and___ at the anode.

67) A salt is an electrolytic made up of a positive Ion other than___ Ion and a negative ions other than___ion.

68) With platinum electrodes hydrogen is liberated at the ___ and oxygen at the___ during the electrolysis of acidified water.

69) electrolysis is the passage of ___ through a liquid or a solution accompanied by a change __ change.

70) An____ is a homogeneous mixture of two or more metels or a metal and a ____.

71) The properties of an alloy are not necessarily____ between those of its ____. The melting point of an alloy is always less than that of its constitution_____.

72) An alloy in which ____ is present as one of the Constituents is called a____ alloy.

73) Alloy are made to develop certain____ properties not___ by elements.

74) The ore from which Aluminium is extracted must first be treated with ___so that pure aluminium oxide can be obtained

75) Pure Aluminium oxide is dissolved in ___to make a conducting solution.

76) When lead nitrate is heated. The Residue of ___is left. The gases founder are____ and ___.

77) The properties of an aqueous solution of nitric acid are due to the presence of hydrogen ___.

78) The property of Sulphuric Acid which is used in the laboratory preparation of Nitric acid is its ____nature.

79) The nitric acid prepared in laboratory is___ in colour but the pure concentrated acid is a___ liquid.

80) Compounds having the same molecular formula but having different structural formula are called ____(homologous/isomers)

81) Organic compounds are___ compounds. (ionic/covalent)

82) The organic compounds containing carbon and ___atoms only are called hydrocarbons.(oxygen/hydrogen)

83) Organic compounds are generally insoluble in____.(organic solvents/water)

84) C=C bond is ___than C-C bond. (Longer/ sorter)

85) An alkyl group is formed by removing a ___atom from the parent alkaline. (carbon/ hydrogen)

86) Ethanol containing some methanol added to it is called___ alcohol.(ethylated/methylated)

87) The next higher homologous of methanal is ___( propanal/ ethanal)

88) The conversion of Ethanol to ethene is an example of___ (dehydration/dehydrogenation)

89) converting ethanol to ethene requires the use of ___ (concentrated hydrochloric acid/ concentrated nitric acid/ concentrated sulphuric acid)

90) The conversion of Ethene to Ethane is an example of ____.(hydration/hydrogenation)

91) The catalyst used in the conversion of Ethene to Ethane is commonly ___(iron/Cobalt/Nickel)




Thursday, 15 December 2022

MODEL TEST PAPER -2 (Life Science) W. B

Time: 3 hours 15 minutes
Full Marks:90

               Group -A
(Answer to all questions)

1. Write the answer in complete sentence by choosing the correct answer for each question will respectively serial number:   1x15

1.1) The gland which according to you is known as master gland is:
A) pituitary B) adrenal C) pancreas  D) thyroid

1.2) which of the following breaks dormancy and causes germination of seed--
A) Auxin B) Gibberellin C) Cytokinin D) Ethylene

1.3. Select from the following the number of cranial nerves present in human beings--
A)10 pairs B) 12 pairs C) 24 pairs D) 31 pairs

1.4. The name of the sugar present in DNA is--
A) Ribose B) Pentose C) Deoxyribose D) glucose

1.5. The type of asexual reproduction found in planeria is
A) Fragmentation B) Spore production C) regeneration D) budding

1.6. A person is passing through the period between childhood and maturity. Choose the time period he is passing through--
A) 10-19 years B) 15-25 years C) 13-19 years  D) 25-35 years
1.7. He performed experiments on heredity and is known as father of genetics. He is
A) Lamarck B) Darwin C) Mendel D)  Johanson

1.8. Deduce the type of gametes that could be formed from YyRr--
A) 3 types B) 4 types C) 5 types D) 2 types

1.9. A boy can roll his tongue while another boy can not. They are each others--
A) variations B) locus C) characters D) genotype

1.10. Identify the oldest fossil of horse from the following--
A) Pliohippus B) Merychippus C) Mesohippus D) Eohippus

1.11. The present in fish that helps to maintain buoyancy is--
A) gill B) swim bladder C) tailfin D) thoracic fin

1.12. the theory "Struggle for existence" was proposed by
A) Lamarck B) Hugo-De-Vris C) Weismann D) Darwin

1.13. the nitrogen fixing bacteria which is present symbiotically in roor or leguminous plant is-
A) Azotobacter B) Clostridium C) rhizobium D) nitrobactor

1.14. you have visited a hotspot in india where you find one-horned rhino. you have visited
A) sundaland B) western ghats and lanka C) Indo-Burma D) Eastern Himalayas

1.15. The chemical used in Cryporeservation is
A) liquid oxygen B) liquid nitrogen C) liquid carbondioxide E) liquid methane

            Group - B

2. Answer any 21 questions of 26 questions given below as instructed.                  1x 21= 21
Fill in the blanks with proper words in the following sentences (any five):.                   1x5= 5

2.1. the three layers covering of human brain is called___

2.2. the unit of asexual reproduction is____

2.3. The importance of ____ chromosome is maximum to determine the sex of human being.

2.4. The theory of origin of new organ to meet the demand is the opinion put forward by____

2.5. ___ is a disease you will find in an area suffering from water pollution.

2.6. The Asian lion can be found in the ____sanctuary of Gujarat.

Decide whether the following statements are true or false (any five).                      1x5= 5

2.7. Insufficient release of STH can make a child dwarf.

2.8. In cross pollination there is no need of carrier.

2.9. when a pure tall and a pure dwarf plant are crossed then the offspring produced is a hybrid.

2.10. Cactus could survive without water at a stretch in the hot desert conditions.

2.11 Chewing of tobacco can lead to asthma.

2.12. A high intensed sound can cause damage to our digestive tract.

Match the words and rewrite the correct pair mentioning the serial number of both the columns.  (Only five):.              5x1= 5

Column A
2.13. Amoeba
2.14. DNA
2.15. Incomplete dominance
2.16. Bee dance
2.17. greenhouse gas
2.18. Meiotic cell division

Column B
a) carbon dioxide
b) Pseudopodia
c) evening glory
d) crossing over
e) communication
f) Singlila
g) Double stranded

Answer in a single word or in a single sentences (any 6):.   1x6=6

2.19 choose the odd one and write it:
Oxytocin, Prolactin, Follicle Stimulating Hormone, Luteinising hormone.

2.20. A plant hormone acts as chemical messenger. "explain the statement.

2.21. A pair of related terms is given below. On the basis of the relationship in the first pair write the suitable word in the gap of the second pair.
Planaria: regeneration:: Yeast: __

2.22. In guineapig, black fur is dominant over white fur, Suggest what would be the probable genotype of a white guineapig.

2.23. Deduce what happens when male gametes(22A + X) fuses with female gamete.

2.24. Name the organs whose origin are same but they function differently.

2.25. There is a industry near a locality sending out smoke. Write the name of a disease that can spread in the locality because of it.

2.26. An alkaloid obtained from a particular plant is used to reduce the high blood pressure. Recollect the name of that plant and write it.

                     Group-C

3. Answer any 12 questions in 2- 3 sentences out of 17 questions given below.             2x12= 24

3.1. you are concentrating upon your studies when suddenly an intense torch light flashes upon your eyes. Explain your reaction and the mechanism behind it.

3.2. Discuss about the pituitary gland on the basis of following points--
   • location
   • Two major divisions

3.3. A bird is flying in sky. Explain how its feathers, the remiges and the rectices are helping in its action.

3.4. Why does a plant acquire bushy appearance well its terminal end is nipped off regularly? explain this with the role of plant hormone.

3.5. Differentiate between sexual and asexual reproduction on the basis of the following points--
   • number of parental organisms required.
  • nature of offsprings produced.

3.6. justify what may happen if the cell cycle does not take place properly.

3.7. why is alteration of generation important in ferns.

3.8. you are given a tall pea plant bearing violet flowers. Deduce the probable genotype of the pea plant.

3.9. with the help of a cross calculate the percentage of normal children produced from a colour blind carrier mother and a normal father.

3.10. Recall and write the phenotype and genotype ratio of F² generation of a cross between a pure yellow round seeded pea plant with a pure green-wrinkled seeded pea plant.

3.11. Discuss the role of air sac in the adaptation of pigeon.

3.12. Recall the names of the gases used in Miller and Urey's experiment and write down the ratio in which they were used.

3.13. Justify with two reasons how modern horse has gradually evolved from its forerunners.

3.14. why is Ammonification considered to be an important stage in nitrogen cycle ?

3.15. Why is sundarban called biosphere reserve ?

3.16. write two problems due to population explosion in your city.

3.17. write two difference between in-situ and ex-situ conversation on the basis of
• place of conservation
• access of public

            Group- D
Write the six questions on their alternatives given below. The mark allotted for each question is 5(the division of marks is either 3 + 2, 2 + 3 or 5)

4. Answer 6 questions or there alternatives given below: 5x6= 30

4.1. Draw this structural and functional unit nervous system and label.                       3+2= 5
A) Dendron B) node of Ranvier C) Schwann cells D) Axon Hillock
OR
Draw the Anaphase stage of animal cell division and label the following parts --
A) centrosome B) chromosomal spindle fibres C) continuous spindle fibre D) Chromatid.

4.2. A baby is born a few days ago. Discuss the phases of growth taking place in its body. Mention which part of a flower develop into a fruit which part in to seed after fertilization takes place.                                3+2= 5
OR
You have brought a rose twig from your friend's house and planted it in your garden. Discuss the method you have adopted and why?
How will you differentiate between the cell division of a somatic cell and a reproductive mother cell on the basis of --
• nature of chromosome division
• number of daughter cells produced.

4.3 With the help of checker board and showing cross upto F² generation examplify how Mendel deduced his first law. State the law.                 3+2= 5
OR
Differentiate between Thalassemia and and beyond haemophilia on the basis of the following points--
• type of chromosomes affected.
• symptom
Discuss what should be done to prevent birth of more children suffering from genetic diseases and how can you do it ?    2+3=5

4.4. How does camel dehydration in the desert condition ? discuss the psychological adaptation of sundari in the salt water condition.               3+2= 5
OR
Discuss how wings of bat and birds indicate convergent evolution. there is a garbage dumping station at a place. Discuss what types of struggle for existence you may find there.

4.5. what is the need of conservation in in today's world ? you have recently visited a sanctuary Write two characteristic features you find typical to it.             3+2= 5
OR
you live near the airport area. Deduce what pollution you face every day and what are its effect on your body.

4.6. what criteria should you take in to account to declare a place a hotspot ? you have been invited to deliver a speech in an awareness programme on Lung cancer. Discuss what you must include in your speech.     3+2= 5
OR
list up the reasons behind the reduction in number of tigers in a forest. what steps should you take to overcome this?

Tuesday, 29 November 2022

BIOLOGY (SHORT QUESTIONS)





Odd one out

1) adrenal, liver, thyroid, pituitary

2) coughing, sneezing, eating, blinking

3) corpus luteum, corpus callosum, pons, Cerebellum

4) sulphur dioxide, carbon monoxide, oxygen, Nitrogen dioxide 

5) thyroid gland, adrenal gland, pituitary gland, prostate gland.

6) cretinism, myxedema, goitre, scurvy.

7) insulin, glucagon, diabetes insipidus., diabetes mellitus 

8) calyx, corolla, style., androcium

9) insulin, blood sugar., adrenaline, thyroxin 

10) oestrogen, Progesterone, testosterone, prolactin.

11) Cerebrum, cranium., Cerebellum, pons

12) cell wall, plastids, large vacuole, centrosome.

13) cortex, pelvis, retina., medulla

14) ovary, fallopian tube, ureter., uterus

15) Myopia, hypermetropia, xerophthamia., astigmatism

16) thyroid gland, adrenal gland, pituitary gland, prostate gland.

17) cretinism, myxedema, goitre, scurvy.

18) insulin, glucagon, diabetes insipidus., diabetes mellitus.

19) pons, Cerebellum, medulla oblongota, Cerebrum.

Match the column of the following:

1)
Column A
A) liver
B) ova
C) cochlea
D) vein
E) neuron
F) stomata
G) grana

Column B
a) basic unit of the brain
b) stimulated by light
c) deoxygenated blood
d) part of the sclera
e) haploid cell
f) blind sacs
g) found in the kidney
h) audio receptors
i) diffusion of gases
j) breakdown of proteins
k) diploid cell


2) Column A
A) chromosomes become arranged in a horizontal plane at the equator
B) daughter chromosomes move to opposite poles of the spindle
C) chromosomes become visible as fine, long threads
D) chromosomes lose their distinctiveness and gradually become transformed into chromatin network.
Column B
a) Anaphase
b) Prophase
c) Telephase
d) Metaphase

3) Given below a set of  biological terms. Of these paired into  matching pairs.

Cell wall, Deoxy ribonucleic acid, neurotransmitter, spinal cord, cellulose, chromosome, adenosine triphosphate, neuron, energy molecule, acetylcholine, kidney, 

4) column A
A) birth rate
B) demography
C) population density
D) tubectomy
E) death rate
F) population explosion
G) immigration
H) growth rate

Column B
a) the addition of new individuals of the population from other localities
b) natality
c) the high rate of growth of human population
d) the excess of births over deaths in a year per thousand population
e) mortality
f) population dynamics
g) cutting and ligaturing the oviduct of both sides
h) the size of a population in relation to per unit area at a given time.


5) column A
A) The blind spot
B) the yellow spot
C) the stroma
D) the grana
E) cretinism
F) myxoedema
G) afferent neuron
H) mortality

Column B
a) carries impulses away from the brain and spinal cord
b) carries impulses towards the brain and spinal cord
c) is the place for aerobic respiration
d) is the place for dark reaction of photosynthesis
e) is the place through which transpiration takes place
f) is the place for light reaction of photosynthesis
g) is the number of deaths in a specified period of time
h) is the number of live births in a specified period of time
i) is free of rod cells
j) is the exact centre of the posterior portion of the retina
k) is a condition due to undersecretion of thyroxin in an adult
l) is a condition due to lack of thyroxin in a child.


Difference between:

1) artery/vein
2) serum/vaccine
3) photosynthesis/respiration
4) yellow spot/blind spot
5) blood plasma/serum
6) catabolism/anabolism
7) sperm/Ovum
8) hormone/enzyme
9) nervous system/hormonal system
10) vasectomy/tubectomy
11) castration/ovariectomy
12) emigration/immigration
13) homozygous/heterozygous
14) dominant/recessive genes
15) phenotype/genotype
16) heredity/genetics 
17) sensory/motor neurone (function)
18) blood/lymph (composition)
19) ureter/urethra (function)
20) osmosis/diffusion (flow of solvent molecules)

21) myopia/hypermetropia (cause of the defect)

22) Glycolysis/Kreb's cycle (reaction site of the process in a cell)

23) artery/vein (direction of blood flow)

24) Cerebrum/Cerebellum

25) red blood corpuscle/white blood corpuscle

Fill in the blanks:

1) insulin is produced in ___
Islets of Langerhans of pancreas (Beta cells)

2) lack of iodine in diet causes ___
Goitre

3) ___ is produced by inner medullary part of adrenal gland.
Adrenaline

4) in adult deficiency in secretion of thyroid produces a disease called ___
Myxedema

5) insulin makes the liver turn blood sugar into ___
Glycog6

6) the gland which secrets thyroxin is called ___
Thyroid gland

7) the endocrine parts of the pancreas is___
Islets of Langerhans

8) nervous system and ___ are very close related.
Endocrine system.

9) The sign of family planning and family welfare in India ___
Inverted red triangle

10) The surgical removal of testes is known ____
Castration

11) The population of whole of Asia beyond 2001 AD is expected to be ____
13 billion

12) total population in India in 1999 was____
100 millions

13) world population in 1994 was____
 5. 6 billion
14) prevention of fertilization is done by using______
Contraceptive

15) number of deaths per 1000 of population in one year is called ___
Death rate

16) The study of population in a statistical method is known as ___
Demography 

17) fill the blanks with following words (Osmosis, Ciliary muscles, aorta, stapes, alveoli, WHO, malleus, diffusion, dorsal aorta, bronchioles, iris, red cross
 a) The part of the eye responsible for change in the size of the pupil is the____
Ciliary muscles
b) The process by which molecules distribute themselves evenly within the space they occupy is termed ___
Diffusion
c) The blood vessel leaving the left ventricle of the mammalian heart is the ____
Dorsal aorta
d) The ear ossicles in contact with the oval window of the inner ear is the ____
Malleus 

18) The gaseous pollutant which causes acid rain is ___(carbon monoxide, carbon dioxide, nitrogen dioxide).

19) The valve present between the left atrium and the left ventricle is the ____(Tricuspid valve, biscuspid valve, semilunar valve)

20) The blood vessel supplying blood to the kidney ___(renal vein, renal artery, dorsal aorta)



Choose the correct answer to the following:
1) Cerebellum is the part of the brain which is responsible for:
A) Interpreting sensations
B) conducting reflexes in the body
C) maintaining posture and equilibrium.
D) controlling thinking, memory and reasoning

2) The mineral elements essential for the clotting of blood is:
A) iron B) calcium. C) iodine D) sulphur

3) A plant is kept in a dark cupboard for about 48 hours before conducting any experiment on photosynthesis to:
A) remove chlorophyll from the leaves
B) remove starch from the plant
C) ensure that no photosynthesis occurs.
D) ensure that the leaves are free from starch.

4) The part of the human ear concerned with hearing are:
A) cochlea, ear ossicles and tympanum.
B) semicircular canals, utricules and saccules
C) eustachian tube, tympanum and utricules
D) perilymph, ear ossicles and semicircular canals 

5) Marine fish when thrown under tap water bursts because of:
A) endosmosis. B) Exosmosis C) diffusion D) plasmolysis 

6) Duplicated chromosomes are joined at a point termed
A) centrosome B) centromere. C) centriole D) Chromatid

7) Osmosis involves diffusion of:
A) suspended particles from lower to higher concentration
B) suspended particles from higher to lower concentration
C) water from the more concentrated solution to the less concentrated solution
D) water from the less concentrated solution to the more concentrated solution.

8) Transpiration pull will be maximum under which of the following conditions:
A) open stomata, dry atmosphere and moist soil
B) open stomata, high humid atmosphere and well irrigated soil
C) open stomata, high humid atmosphere and dry soil
D) closed stomata, dry atmosphere and dry soil.

9) Which one of these reactions occur during photosynthesis:
A) carbon dioxide is reduced and water is Oxidised
B) water is reduced and carbon dioxide is Oxidised.
C) carbon dioxide and water are both Oxidised
D) carbon dioxide and water are reduced 

10) excretion commonly involves:
A) removal of all by products during catabolism
B) removal of all by products during anabolism
C) removal of nitrogenous waste.
D) all of the above 

11) In mammals, the corpus callosum connects:
A) the two optic lobes
B) the two cerebral hemispheres.
C) the Cerebrum of the Cerebellum
D) the pons to the medulla oblongota 

12) Which one of the following is the route that a sperm follows when it leaves the testis of a mammal:
A) vas deferns--> epididymis --> urethra
B) urethra --> epididymis --> vas deferns-->
C) epididymis --> urethra--> vas deferns
D) epididymis --> vas deferns--> urethra.

13) The space between the cell wall and plasma membrane in a plasmolysed cell is filled with:
A) isotonic solution
B) hypotonic solution
C) hypertonic solution.
D) water

14) which of the following glands has both endocrine and exocrine functions:
A) pituitary gland
B) thyroid gland
C) pancreas gland.
D) adrenal gland 

15) The specific function of light energy in the process of photosynthesis is to:
A) reduce carbon dioxide
B) synthesize glucose
C) activate chlorophyll
D) split water

16) Agranulocytes are:
A) lymphocytes, monocytes
B) lymphocytes, basophils
C) eosinophils, basophils
D eosinophils, monocytes

17) column A
A( Bowman's capsule
B) dendrons
C) acrosome
D) iris
E) ovulation
F) pacemaker
G) pleura
H) nephron

Column B
a) spermatozoa
b) kidney tubules
c) S. A. Node
d) A. V. Node
e) glomerular filtration
f) lungs
g) nerve impulse
h) testis
I) colour of eye
j) oxytocin
k) luteinising hormone
l) Progesterone

Give the technical terms:

1) loss of water in the form of water droplets from the margin of leaves.

2) A statistical study of the human population of a region.

3) movement of WBC 's out of capillary walls at the site of the injury.

4) the period of intrauterine development of the embryo.

5) a colourless plastid in the cytoplasm of plant cells around which starch collects.

6) Protein produced in the blood to fight and destroy harmful microbes

7) the phase of contradiction of the chamber of the heart 

8) The onset of reproductive phase in a young female.

9) rupture of follicle and release of ovum from the ovary.

10) monthly discharge of blood and disintegrated tissue in human female.

11) process of fusion of ovum and sperm.

12) fixing of developing zygote (blastocyst) on the uterine wall.

13) gland which produces hormones.

14) The number of person per square kilometre at any one given time.

15) A membrane that surrounds the foetus and secrets a protective fluid.

16) protective coverings of the brain and spinal cord

17) A statistical study of human population.

18) The inward movement of solvent molecules through the plasma membrane of a cell

19) loss of water in the form of droplets from the margin of a leaf.

20) Adjustment of the eye in order to obtain a clear vision of objects at different distances.

21) The inset of reproductive phase in a young female.

22) Rupture of follicle and release of ovum from the ovary.

23) monthly discharge of blood and disintegrated tissue in human female.

24) process of fusion of ovum and sperm.

25) fixing of developing zygote on the uterine wall.


True/false

1) pregnancy in women can be prevented by the method of vasectomy

2) cones are the receptor cells in the retina of the eye sensitive to dim light.

3) The unit of light absorbed by the chlorophyll during photosynthesis is the proton.

4) the part of the ear associated with balance is the cochlea.

5) Deafness is caused due to the rupturing of the pinna

6) cells that have lost their water contents are said to be Deplasmolysed. 

7) photosynthesis results in loss of the dry weight of the plant.

8) Xylem is the water conducting tissue in plants



Name the following:

1) A substance that initiates an immune response.

2) The structure in which the testes are present in a man.

3) The valves present in between the Chambers of the right side of the human heart.

4) Condition of a cell placed in a hypotonic solution.

5) A pollutant largely responsible for Acid Rain.

6) The part of the human brain that controls body temperature.

7) The genetic constitution of an organism.

8) the part of the eye responsible for its shapes.

9) the part of the chloroplast where the dark reaction of photosynthesis takes place.

10) Structure which is responsible for the production of ovum.

11) The fusion of male and female gametes.

12) The place where embryo develops.

13) The male reproductive cells of a mammals.

14) A pollutant which reduces the oxygen carrying capacity of blood.

15) The elements required for clotting blood in man

16) The tube that leads from the ovary to the uterus.

17) Opening found on the undersurface of dorsoventral leaves

18) Tissue concerned with upward conduction of water in plants.

19) Condition of cell which the cell contents are shrunken.

20) The duct which transports urine from the kidney to the urinary bladder.

21) The endocrine gland which produces emergency hormone.

22) The fluid that is present inside and outside the brain.

23) The opening through which light enters the eyes.

24) Opening on the stem through which transpiration occurs.

25) The organ in man concerned with maintaining water balance in the body.

26) The photosensitive pigment present in the 'rod' cells in the retina.

27) The soluble protein present in blood plasma responsible for clotting.

28) The part of the female reproductive system where fertilization- takes place.

29) The process by which leucocytes engulf and destroy bacteria.

30) Respiratory opening found on stems of woody plants.

31) The process by which plants lose water in the form of droplets.

32) plants that prepare their own food from basic raw materials.

33) The organ which produces urea.

34) The iron containing pigment in Erythrocytes.

35) The junction between two nerve cells.

36) An apparatus to compare the rate of transpiration in cut shoots.

37) The pressure exerted by cell contents on a plant cell wall.

38) The fluid surrounding the developing embryo.

39) The outer part of the kidney containing the Bowman's capsules.

40) The plastid found in the cells of yellow petals.

41) The scientific study of human population.

42) The hormone secreted by beta cells of islets of Langerhans.

43) The energy currency of a cell.

44) The part of the brain which is concerned with memory.

45) A cell organelle is found only in animal cell but absent in plant cell.

46) Shrinkage of protoplasm of a living cell when it is kept in a strong solution.

47) The permanent surgical method of family planning in male.

48) The hormone secreted by pituitary gland which controls the urine formation.

49) The structure where fertilization takes place in female reproductive organs

50) The cells surrounding the stomata.

51) The plasma part from where fibrinogen is removed.

52) The process by which water comes out as water drops along the margin of the leaf.

53) The process by which exchange of genetical material takes place between homologous chromosomes.

54) The unit of nervous action in human body.

55) The pigments present in the rods of retina.

56) The part of the brain which is responsible for the balancing the body.

57) The apparatus by which blood pressure is measured.

58) The substance present inside the vitreous chamber of the eye.

59) medical termination of pregnancy.

60) The gland which is present at the base of eyelash.

61) The conditions caused due to the undersecretion of thyroxin in the adult.

62) The chemical used to reduce the rate of transpiration.

63) The layer of atmosphere which protects us from ultraviolet rays.

64) The duration between the fertilization and child birt.

65) The cells in the testis which produce male sex hormones.

66) The part of the plant cell where food material is reserved.

67) The plants which prepare their own food from the basic raw material.

68) The vein in the human body which carries oxygenated blood.

69) Increase in global temperature due to raise in Carbon dioxide concentration in the atmosphere.

70) A complex nucleic acid molecule found in the chromosome of all organisms which act as a primary genetical material.

71) The tube that carries the egg to the uterus.

72) The type of nuclear division by which two daughter cells are produced from one parent cell with no change in chromosome number.

73) The phase of the cardiac cycle in which auricles contract.

74) The junction between the two nerve cells.

75) The duration between fertilization and the child birth.

76) The splitting of water molecule into two component ions by light.

77) The structure which equalizers the pressure on both sides of the ear drum.

77) The structure which holds the flaps of valve in position and prevents their over turning into auricles of hearts.

79) The part of the nervous system which responds to the reflex action.

80) The organ which produces urea.

81) The photoreceptor found in the retina

82) One organ which has got both endocrine and exocrine gland.

83) Number of sex chromosomes in human being.

84) Chemical composition of genes.

85) Gaseous pollutant which causes acid rain.

Continue....




Monday, 28 November 2022

CHEMISTRY (VIII) Weekly Test


Week -1   
               CHEMISTRY
(Language of Chemistry, Chemical Reaction)
-----------------------------------------------------


Question 1. (Any Three).       1x3= 3

Classify the following reactions
i) Zn(s) + H₂SO₄(aq)-->ZnSO₄+ H₂ (g)
ii) BaCl₂(aq)+ Na₂SO₄(aq) --> BaSO₄(s) + 2NaCl(aq)
iii) 2CO(g) + O₂(g) ---> 2CO₂(g)
Iv) 2KNO₃(s) ---> 2KNO₂(l)+ O₂(g)

Question 2 (Any Three)        2x3 = 6
Define:
i) Chemical double decomposition
ii) Catalyst
iii) Oxidising agent
iv) Inflammable substance 

Question 3.                                    (2)
CuO(s)+ H₂(g)--------Cu(s)+ H₂O(l).
In the above reaction, by giving reasons, explain which substance is:
i) Oxidised
ii) Reduced
iii) Oxidising agent
iv) Reducing agent

OR
Write the formula of the following:
i) Ammonium sulphate
ii) Zinc carbonate
iii) Lead hydroxide
iv) Barium chooride

Question 4.                                 (3x1)
State the valency and formula of the following:
i) Ammonia
ii) calcium
iii) Ferric

Question 5.                            1x3 = 3
Write the formula and then balance the following equations:
i) Ammonium chloride --> Ammonia+ Hydrogen chloride
ii) Red lead oxide --> lead monoxide+ Oxygen
iii) Sodium nitrate --> sodium nitrite+ Oxygen.

Question 6.                                     (1)
XCl₂ is the chloride of metal X. Write down the formula of sulphate and hydroxide.         

Question 7.                                    (2)
What is the difference between Exothermic and Endothermic reaction.    


BIOLOGY (IX) weekly Test

Week -1
                    BIOLOGY.             


Question 1(Any three) 1x3= 3

i) Sweat glands are present in __
ii) Dermis is made up of ___tissue.
iii) Inability to see in dimlight, due to deficiency of ______

Question 2.                          1x3= 3

Name the following:
i) Lump or mass of food that has been chewed and mixed with saliva.
ii) Cells of cornified layer are dead and made of a horny protein is called.
iii) The pigment which imparts skin its colour.

Question 3. (Any three) 2x3= 6

Define:
i) Balanced diet
ii) Peristalsis
iii) Melanin
iv) skin

Question 4.                             1x2=2
Write full form of:
i) BMR
ii) PEM

Question 5 (any two). 2x2= 4

i) Write two functions of skin
ii) Name the main classes of food
iii) Write two functions of Digestive system 

Question 6(Any One).         2x1= 2

i) Write 3 characteristics of enzymes
ii) Name 3 regions of Epidermis layer of skin.

Tuesday, 22 November 2022

ICSE MODEL TEST PAPER (PHYSICS) 22/23

Model test paper 1


              SECTION - A
(All questions are compulsory)

Question 1
a) i) what is meant by the term energy? Name the two forms of mechanical energy. (2)

ii) Define critical angle. (1)

iii) Define erg. (1)


b) i) A water pump raises 373kg of water through a height of 10m in 10 seconds. Calculate the power at which the pump wirks. (Assume g= 10m/s). (2)

ii) What is dispersion of light. (2)


c) i) What is the commonly used for electrical energy consumed? Define it. (2)
ii) What is resonance? Give an example of resonance. (2)

d)i) Distinction between real and virtual image. (2)
 
ii) Show, using a ray diagram, how a converging lens can be used to form the virtual image. (2)

e) i) what is the difference between forced and natural vibrations? (2)

ii) with the help of a simple diagram, Show that mechanical advantages of a single fixed pulley is 1 and that of a single movable Pulley is 2. (2)

f) i) give one advantage and one disadvantage of connecting electric cell in a parallel. (2)

ii) state two uses of electromagnets. (2)


g) i) How much does it cost to run one heater of 1000W and two electric bulbs of 40 W each for 8 hours if 1 unit of electricity cost ₹2. (2)

ii) why is it dangerous to use wet hands to put off a switch? what purpose does a fuse serve in a circuit ? (2)

h) i) What is the relation between the joule and calorie; the joule and kilocalorie? (2)

ii) What is meant by the refractive index of a medium with respect to air ? (2)

i) i) What is meant by colour coding of electrical wires ? (2)

ii) What do you understand by the specific latent heat of vaporisation of a substance? (2)

j) i) A pair of pliers and scissors belong to the same class of levers.
A) which one has mechanical advantage less than one?
B) State the usefulness of such a machine? (2)

ii) State the conditions for echoes . (2)


                SECTION - B
(Answer any four questions)

Question 2
a) The diagram (MP1D1) shows a pulley arrangement.
i) In this diagram mark the tensions in the different parts of the string.
ii) What is the velocity ratio ?
iii) If the efficiency is 80%, what is the mechanical advantage?
iv) State two factors that reduce the efficiency. (4)

b) i) What is meant by the internal resistance of a cell? What is its unit ? (4)
ii) The terminal voltage of a cell of e.m.f. 2V is 1.5V. Find the current in the circuit and the internal resistance of the cell if the external resistance is 6 ohms. 

c) Define right hand thumb rule. (2)



Question 3

a) Differentiate between the following:
i) noise and a musical note.
ii) frequency and wavelength of sound. (4)

b) The human ear can detect continuous sounds in the frequency range from 20 Hz to 20000 Hz. Assuming the speed of the sound in air is 330 m/s for all frequencies, calculate the wavelength and corresponding to given extreme to frequencies of the range. (2)

c) Give reasons for the following:
i) the same musical note when played on a piano and when played on a flute sounds different.
ii) soldiers often March 'out of step' while crossing bridges. (4)

Question 4

a) i) The figure shows a smooth cardboard arranged in a horizontal plane with a very small hole in its centre. A vertical wire passes through the hole and is connected to a battery and a key, Redraw the diagram and show the directions of the magnetic field and the current.
ii) Define Potential difference. (4)

b) Define the terms
i) load
ii) effort
iii) mechanical advantage
iv) velocity ratio. (4)

c) A man stands at a distance of 25m from a high wall. He hears the echo off the high wall, produced by a clap of his hands. If the velocity of sound in air is 330 m/s, what would be the time interval between his original clap and hearing of the echo? (2)


Question 5

a)i) Calculate the resistance between the points A and B in the network shown (MP1D3). (2)

ii) What is a simple machine ? Write the relation between load, effort and efficiency. (3)

b) which would be worse, the burn you get holding your hand in a jet of steam or that got from boiling water, both at 100° ? Give a reason for your answer. (2)

c) In an experiment to measure the specific heat capacity of brass, 0.2 kg of hot water, at a temperature 65°C, was poured into a heavy brass container of mass 1.5 kg, initially at 15°C. After steering, the final temperature reached was 45°C. Assume that the specific heat capacity of water is 4200 J/kg/°C.
i) Calculate the heat energy released by the hot water in cooling from 65°C to 45°C.
ii) Assume that the heat energy calculated in part (i) is gained by the brass container in raising its temperature from 15°C to the final common temperature of 45°C. Calculate the heat energy absorbed by the brass container per °C rise in temperature.
iii) using the result obtained in part (iii), Calculate the specific heat capacity of brass. (3)


Question 6
After a robbery, if a window has been broken, there will be tiny particle of glass. Some of these will be found at the scene of the crime and some may be caught in the thief's clothing. If the police can prove that these particles are identical, they have a strong case.
     A method of doing this to suspand the particles of glass in a special liquid. Light of a single colour is shown through the liquid and the particles viewed through a microscope. The temperature of the liquid is then slowly altered. This alters the speed of light through the liquid (i.e., it alters the refractive index). At one particular temperature the particles of glass disappear. if this happens at the same temperature for both sets of glass particles, they probably came from the same broken pane of glass.
a) Complete a copy of the diagram (MP1D4) to show how light bends when it travels from the liquid to the glass and back to the liquid, 
i) If the light slows down the glass.
ii) if the light speeds up in the glass. (4)
b) why is the light used in the police work a single colour ? (2)
c) Under what two circumstances can light moving from a liquid to glass pass straight on without bending ? (2
d) when do the particles of glass disappear in the police method ? (2)


Question 7
The mission of an Alpha particle or emission of Beta particle is nearly always accompanied by what is known as Gamma radiation.
i) How does the ionising power of gamma radiation compare with that of alpha and beta particles ?
ii) Is Gamma radiation more or less penetrating thsn alpha and beta particles?
iii) Is it possible to deflect gamma radiation in the ways that alpha and Beta particles can be deflected, using electric or magnetic fields ?
iv) What is Gamma radiation thought to be ? (4)

b) Radium-226 (²²⁶R⁸⁸) is Radioactive and emits alpha particles.
i) By how much does the atomic number of a radium nucleus (²²⁶Ra⁸⁸) change when an alpha particles is emitted ?
ii) By how much does the mass number of the radium nucleus in part (i) change ?
iii) The new nucleus formed, When a nucleus of ²²⁶Ra⁸⁸ emits an Alpha particle is identified as a nucleus of another element fairly close to radium in the periodic table. identify this element from the data: polonium (Po⁸⁴), (Astatine (At⁸⁵), Radon(Rn⁸⁶) and Francium(Fr⁸⁷). (3)
c) state three major uses of X-rays. (3)

Thursday, 17 November 2022

MODEL TEST PAPER -1 (Life Science) Madhyamik

MODEL TEST PAPER -1

Full Marks-90

               Group A 

Question 1
(Answer all questions).    1x15=15

i) Select from the following the term that describes the movement in the leaves of sundew.
A) photonastic  B) Thermonastic C) Chemonastic C) Seismonastic

ii) Find the hormone that is found in juice of tomato--
A) Auxin B) Gibberellin C) Cytokinin D) Florigen

iii) Identity the hormone popularly called the Maternity hormone.
A) Oestrogen B) Progesterone C) Prolactin D) Testosterone 

iv) Choose that of mitosis during which the chromosomes are arranged on the equator of the cell-
A) Prophase B) Metaphase C) Anaphase D) Telephase

v) Identify the part from which fruit is formed after fertilization--
A) stigma B) ovary C) ovule D) Ovum

vi) The age from 11 to 19 years in human is called--
A) teenage B) adulthood C) adolescence C) Senescence

vii) Laws of heredity has been proposed by--
A) Lamarck B) Darwin C) Mandal D) Miller 

viii) Calculate how many types of gametes are formed from Guinea pig having genotype Bbrr--
A) 1  B) 2 C) 4  D) 3 

ix) Identify the nature of haemophilia--
A) sex linked dominant.
B) Autosomal dominant 
C) Sex linked recessive
D) Autosomal recessive

x) select the propounder of the theory of "inheritance of acquired characters" from the following:
A) Lamarck B) Darwin C) Mendel D) Weisman

xi) Recollect from your memory the oldest Fossil of horse.
A) Pliohippus B) Merychippus C) Mesohippus D) Eohippis

xii) Determine the following the one which according to you is not a vestigal organ is 
A) fingers of hand 
B) Vermiform Appendix
C) Wings of ostrich
D) Coccyx

xiii) Identify the bacterium which you think convert nitrogenous wastes or dead bodies in to Ammonia.
A) nitrosomonas
B) Bacillus mycoides
C) nitrobactor D) Thiobcillus

xiv) Select out of the following the one which is not a chronic disease of lung.
A) Bronchitis B) Asthma C) Fever D) Lung Cancer 

xv) Select from the following the one that is not in-situ conversation
A) national park B) Sanctuary C) Zoo D) Biosphere Reserve


                Group B 

Question 2 
Answer 21 questions out of 26 questions given as below instructed.                         1x21= 21

Fill in the blanks with proper words in the following sentences from (any five):                            1x5= 5

i) ___ is secreted from islets of Langerhans of pancreas.

ii) According to you___ synthesis protein of the cell during cell division.

iii) Haemophilia father's daughter is always___of Haemophilia.

iv) Crocodile is considered to be advanced in evolution over the reptiles as it as a___ chamberd heart.

v) If you visit a place with the maximum biodiversity, you will be able to consider it to be___

vi) Due to requirement of resperine for treatment of high blood pressure, the___ plant is becoming extinct due to overuse.

Decide whether the following statements are true or false (any five):.                                     1x5=5

vii) If a person cannot see nearby objects in needs to use concave lens.

viii) In a base pairing Adenine bands to Thymine.

ix) Autosomes are responsible for sex determination in human being.

x) Darwin wrote the book "Origin of Species By Means of Natural Selection"

xi) Azotobacter is a denitrifying bacteria.

xii) Auxin helps in tropic Movement in plants.

Match the words in Column A to Column B
Column A
xiii) Ciliary locomotion
xiv) fragmentation
xv) Tt
xvi) wings of birds and butterflies
xvii) Singlila National Park
xviii) pollinating agent
Column B
a) honey bee
b) hybrid tall plants
c) analogous organ
d) Paramecium
e) Red panda
f) spirogyra
g) homlogous organ

Answer in a single word or in a single sentence (any 6):   1x6= 6

xix) Choose the odd one and write it:
STH, ACTH, ADH, GTH

xx) write one function of ganglion.

xxi) A pair of related terms is given below on the basis of the relationship in the first pair white the suitable word in the gap of 2nd pair
DNA: Thymine:: RNA: ____

xxii) what is the ratio of plants in F¹ generation when hybrid tall pea plant is crossed with pure dwarf one ?

xxiii) Determine the type of gametes that can be obtained from a female human being.

xxiv) How many air sacks are present in pigeon?

xxv) Among the following four terms one includes the other three. Find out the one term and write it-- Nitrogen cycle, Nitrification, Ammonifications.

Question 3
Answer any 12 question in 2-3 sentences out of 17 questions given below :                               2x12= 24 

i) How does cytokinin affect plant growth ?

ii) On the basis of the following points distinguish between axon and dendron:
a)  structure
b) function 

iii) State two purposes of locomotion.

iv) Explain how flexion and extension are opposite in action.

v) Name an animal and plant where reproduction occurs by budding.

vi) What do you mean by fertilization in plants?

vii) Explain how cross pollination is different from self pollination regarding use of pollinating agents and character of offspring produced 

viii) "Male is considered as heterogametic sex" - justify the statement.

ix) If husband is normal and wife is carier of thalassemia, what may happen to their four children ?

x) Write down the law that Mendel  inferred by performing the experiment on pure tall and pure Dwarf pea plant.

xi) Mention two significances of fossils in evolution.

xii) State the importance of airsacks of birds.

xiii) Why do you consider the following structure are important:
a) swim bladder in rohu fish
b) salt gland in Sundari plant.

xiv) Assess why SPM is harmful to human health.

xv) Name the biodiversity hotspots which lie in India.

xvi) Explain why Cryporeservation is so important for conserving endangered species.

xvii) JFM is helpful to protect, conserve and flourish our Forest Reserve - explain how.


               Group D
(Long Answer Type questions) 

Write the 6 questions or their alternatives given below. The mark allotted for each questions is 5.
 ( the division of make is 3+2, 2+3  or 5)

i) Draw a neat diagram of neutron and label the following parts:
a) Dendrite b) Axon c) Schwann cell d) Node of Ranvier.              2+3=5
OR
Draw a neat diagram of Anaphase of animal cell division and label the following parts--
a) Chromatid b) Centrosome c) Continuous fibre d) chromosomal fibre

ii) Write chemical composition of chromosome. "Amitosis is known as direct cell division" Explain with the help of an example.       2+3=5
OR
What do you understand by alternation of a generation ? Explain the phases of growth in living things.

iii) Why Mendel select pea plant for his experiment ? Explain incomplete dominance with a checker board.
 OR.                                    2+3= 5
 A patient has come with certain symptoms. How will you identify that he suffering from Haemophilia ? Write the name of organs affected in a thalassemic patient.

iv) Illustrate with diagram how the hearts of vertebrates explain the evolution theory.                 2+3= 5
 OR
 what are the advantages of oval RBC in camel to live in dry desert condition ? How are analogous organs and homologous organs different from each other?

v) What is biomagnification ? Explain with suitable example how does it happen, in and aquatic food chain.                                 3+2= 5
 OR
Analyse three major environmental problems of the Sundarbans with their impacts on biodiversity. Compare between Wildlife Sanctuary and Biosphere Reserve.

vi) Though Sundarban has been recognised as a Biosphere reserve it is gradually decreasing in size and facing some severe environmental problems. Elaborate upon this topic with suitable examples.                                       5
 OR 
Explain the following terms:
a) Acid rain 
b) Global warming
c) Deafness
d) Endemic species
e) Poaching


Wednesday, 16 November 2022

ICSE MODEL TEST PAPER -1 (Biology)


SECTION I (40 Marks)
(Compulsory: To be attempted by all questions)

Question 1
a) Name the following:
i) The gland which secrets insulin.
ii) The part of the brain which is concerned with memory.
iii) The biggest source of air pollution.
iv) An artery which carries deoxygenated blood.
v) Part of the human eye which controls the amount of light entering it.                  (5)

b) Fill in the blanks to represent relationship between structure and their special functional activity.
i) _______ and ultrafiltration (in kidney).
ii) Myelin sheath and ______
iii) spinal cord and ______
iv) Seminiferous tubules and ____
v) _____in the ear are concerned with controlling dynamic balance. (5)

c) Select one suitable word from the alternatives given to fill in the blanks :
i) The foetus draws its oxygen from the ___(amniotic fluid, placenta, umbilical cord)
ii) The condition of a cell when it cannot accommodate any more water is___(turgor pressure, turgid, flaccid)
iii) The blood vessel Which carries oxygenated blood to the heart is ____(aorta, pulmonary vein, pulmonary artery)
iv) The respiratory centre is located in the ____(cerebrum, hypothalamus, medulla oblongota)
v) Myopia can be corrected by ____'_(convex lens, concave lens, surgery).                            (5)

d) Study the diagram( BMT.1 Q-1) answer the questions that follow:
i) Will the level in the thistle funnel rise or fall?
ii) Give the reason to explain your answer.
iii) Name one place where this process occurs in the human body.
iv) What would happen if the above membrane was freely permeable. (5)

e) State one difference in each of the following pairs on the basis of what is indicated in brackets after each.
i) Cerebrum and cerebellum (function)
ii) corpus callosum and corpus luteum (location)
iii) Exosmosis and endosmosis (movement)
iv) Deplasmolysis and plasmolysis (function).         
v) Artery and vein (system).      (5)

f) Mention whether the following statements are true or false:
a) Presbyopia is generally an age related eye defect.
b) Root hair are the extensions of the outer epidermal cell of the root.
c) Deafness is caused due to the rapturing of the pinna.
d) oversecretion of thyroxin causes simple goitre.
e) A dicot leaf is isobilateral.     (5)

g) State one main function of the following:
a) Ear ossicles
b) Iris
c) pituitary gland
d) platelets
e) Nasal chambers.             (5)

h) Write the odd one out and give a reason for your answer.
a) Glycolysis, photosynthesis, photolysis, Carbon dioxide fixation.
b) spleen, thymus, pancreas, tonsil
c) cretinism, gignatism, goitre, beri-beri.
d) uterus, ureter, ovary, fallopian tube
e) myopia, hypermetropia, xeropthalmic, astigmatism. (5)

       Section II (40 Marks)
(Answer any four questions)

Question 2
a) The following represents (BMT 1 Q-2) an experiment performed to demonstrate a particular aspect of photosynthesis. Study the diagram and answer the questions that follows:
i) what is the object of this experiment
ii) what is the chemical marked
iii) what will you observe when you text leaf Y with iodine solution
iv) name the process which is the reverse of photosynthesis in terms of the end products. (5)

b) Define the following:
i) Antibiotic.
ii) pollutant
c) plasmolysis
d) gestation
e) transpiration. (5)

Question 3
a) The figure (BM T 1Q3) represent the vertical section of a leaf.
i) Name the parts labelled 1 to 5
ii) what do the two arrows(dotted and solid) indicate in the day time and at night.
iii) how many leaf veins have been shown in this section (5)

b) i) mention any two harmful effects of noise pollution.
ii) What is the emblem (sign) of Family Planning and Family Welfare in India?
iii) Define demography. (5)

Question 4

a) Differentiate between the following pairs:
i) blood plasma/ serum
ii) neuron/nephron
iii) transpiration/guttation
iv) night blindness/colour blindness
v) photosynthesis/respiration. (5)

b) Given diagram (BMT1 Q4) of the external features of the heart:
i) Name the parts 1 to 7
ii) what happens if the coronary artery gets an internal clot
iii) mantion one structural difference between 5 and 4 (5)


Question 5

a) The diagram (BMT1 Q5) is intended to represent an experimental setup for demonstrating certain aspects of the air breathed out. The two valves C and D help to regulate the direction of the flow of air as represented by the arrows. 
Answer the following questions:
i) There are serious mistakes at two places in the diagram. Redrew the diagram correctly to eliminate these mistakes
ii) what is the aim of the experiment 
iii) name the liquid contained in the test tube A and liquid in test tube B.
iv) what would be the observations after performing the experiment. (5)

b) i) draw a diagram of the human excretory system and label the following:
Renal cortex, renal medulla, renal pelvis, ureter, urinary bladder and urethra.
ii) list the main constituents of normal human urine.
iii) name the blood vessels which enter and leave the kidney. (5)

Question 6

a) Diagram (BMT 1Q6) are different stages in the fertilisation of an egg.
i) Arrange the stage in the correct order as they would have taken place.
ii) in the female reproductive system where does this process takes place
iii) differentiate between identical and fraternal twins
iv) what is meant by colostrum? State its function. (5)

b) Give appropriate terms for the following:
i) providing readymade antibodies from outside for treating certain infectious diseases.
ii) The number of persons per square kilometre(km²) at any one given time.
iv) The onset of mensuration in a young girl at about the age of 13 years.
v) combination of smoke and fog. (5)

Question 7

Explain briefly the following statements:
a) Abnormally large numbers of WBC in the blood is usually an indication of some infection in our body. (2)
b) human blood circulation is called double circulatory system. (2)
c) veins have valves at intervals in their inner lining whereas the arteries do not have valves. (2)
d) most often only one embryo is formed at a time, although there are two ovaries in women. (2)
e) Insulin is injected into the body of a highly diabetic patients and not given orally. (2)







Monday, 7 November 2022

MODEL TEST PAPER Physical science (Madhymik) 22/23

 MODEL TEST PAPER -2

Time: 3 hours 15 minutes.  
 Full Marks: 90
--------------------------------------------------------
                 Group A


Question 1
MCQ type question: (All questions are compulsory).               1x 15= 15
Each of the following questions has four alternatives. Write the correct one
1.1. Which is not the source of non conventional energy ?
A) solar energy B) wind energy C) coal D) tidal energy

1.2. Charles'law V-t graph Shows the temperature
A) 100C B) -273C C) 0C D) 273C

1.3. The vapour density of an alkyne is 20. The number of H atom in that alkaline is 
A) 3 B) 4 C) 2 D) 0 

1.4. Which one is the unit of Coefficient of volume expansion
A) m³ B) °F⁻¹ C) °C D) m⁻³

1.5. The linear magnification of lens becomes unity, when
A) u= 2v  B) u= 0 C) 2u= v D) u= v 

1.6. An object is placed in front of a concave mirror, produces a real and magnified image. If the focal length of the mirror is 20cm, the position of the object is
A) 40cm B) 30cm D) 10cm D) 50cm

1.7. The equivalent resistance of 20 ohm each connected in parallel is
A) 10ohm B) 100ohm C) 1ohm D) 20ohm

1.8.  The current passing through an electric iron has been doubled. The heat produced will be 
A) half B) double C) one-fourth D)  four times

1.9. Number of neutrons present in Alpha particle is
A) 2 B) 4 C) 1 D) 0 

1.10. Mendeleev's periodic table is based on 
A) atomic radius B) atomic volume C) atomic number D) atomic weight

1.11. In formation of which of the following compounds octet rule is not obeyed?
A) NaCl B) LiH C) KCl D) MgO

1.12. H₂S is a
A) weak, dibasic acid
B) weak, monobasic acid
C) strong, monobasic acid
D) strong, diabetic Acid

1.13. which one of the following is Sulphide Ore
A) bauxite B) zinc blend C) rock salt D) hematite 

1.14. Which is produced at cathode during electrolysis of dilute aqueous solution of NaCl
A) Na B) H₂ C) Cl₂ D) O₂

1.15. If the general formula of alkene is CₙH₂ₙ , then the lowest value of n will be
A) 1 B) 2 C) 3 D) 0 


                 Group B

Question 2 .         (1x17)+4= 21
Answer the following question ( alternatives are to be noted):

2.1.  Which atom emerged from chlorofluorocarbon under the influence of UV rays does dissociate ozone gas into oxygen.
OR
In which layer the density of atmosphere is maximum

2.2. Mention one harmful effect of global warming.

2.3. A gas has vapor density 32. What will be the mass of 5.6 L. of the gas ?

2.4. Write the conditions a real gas behaves in an ideal fashion.

2.5. The S.I unit of thermal resistivity is........ 
OR
Which type of mirror is used as 'shaving mirror'

2.6. What type of image is always made by a concave lens ?

2.7. What is the relation between focal length and radius of curvature of a spherical mirror?

2.8. For series combination of resistors, which physical quantity remains same for each of the resistors?

2.9. Tick the right answer :-
An AC generator works on the principle of (magnetic effect of current/electromagnetic induction)

2.10. Define mass defect ?
OR
How many neutrons are released in each fission reaction ?
2.11. Match the Column:
Column A.                      Column B
a) Extracted by reduction     Cs
b) present in duralumin.       Zn
c) extracted from hematite  Fe
d) highly electropositive       Mg

2.12. What will be the formula of the compound produced from X and Y ? (X= 13, Y= 70)

2.13. Name the electrolyte used in gold plating of article through electrolysis ?
OR
Give an example of weak electrolyte

2.14. Which of the following are non electrolytes ?
common salt solution, sugar solution, HCl acid & alcohol.

2.15.  what will be the product when H₂S is passed through aqueous of Silver nitrate ?
OR
 Name the chemical used in the laboratory preparation of Nitrogen gas .

2.16. What will be that colour of the precipitate formed when aqueous solution of ammonia reacts with aqueous solution of Ferric chloride.

2.17. Give the structural formula of propan-1-al.

2.18. Name the monomer of Teflon.

                   Group C

Question 3. Answer the following questions (Alternatives are to be noted).                          2x 9= 18

3.1. What are CBM and methane hydrate?

3.2. Calculate the density of 4 mol hydrogen gas at 8 atm pressure and 300 K temperature. (R= 0.082 lit. atm mol⁻¹K⁻¹)
OR
Calculate the final volume of a gas if pressure orginerally at STP is doubled and it's temperature is made three times.

3.3 What type of lens should be used to correct myopia.                (2)
OR
Draw a ray diagram to show the formation of virtual and erect image by a converging lens. Is the magnification positive or negative ?                        3/2+ 1/2 

3.4. a) EMF of a cell is 1.5 volt- Explain.
b) what is the SI unit of Resistivity ?
OR 
Draw the I-V graph of Ohm's Law.                                      1+1

3.5 A nucleus of an element X has the symbol ²⁰²X₈₄. It emits an Alpha particle then two Beta particles and the final nucleus becomes ᵃY꜀. Give the value of a and c.

3.6. Differentiate between covalent and ionic compounds.

3.7. Give the reducing property of NH₃ with a reaction.

3.8. Write the reaction of cathode and anode in the electrolysis of copper sulphate solution using copper electrodes.
OR
Give one use of each of Zinc and Iron.

3.9. What is the denatured spirit ?  Give an use of it.
OR
 How can you convert Ethanol or Ethylene ?

                 Group D

Question 4.                          3x22= 36
Answer the following questions. (Alternatives are to be noted): 

4.1. What Boyle's law. What is the common constant of Boyle's and Charles law?

4.2. How much amount of Ferrous sulphide reacts with dilute H₂SO₄ to get 1.12L H₂S at NTP ? (Fe= 56, S= 32, O= 16)
OR
How much quantity of Ammonium Nitrite is required to be heated to obtain 8.4 gram of Nitrogen ? (N= 14, H =1)

4.3. a) In a bimetallic strip, brass expands more than Iron, what does it prove ?
b) The coefficient of superficial expansion of metal is 3.6 x 10⁻⁵/°C. Find its coefficient of cubic expansion.
c) How does the Coefficient of thermal conductivity depend on the thickness of the conductor ?  1+1+1
OR
a) Prove that the real expansion of a liquid is always greater than the apparent expansion.
b) Change the CGS unit of thermal conductivity to its SI unit.     2+1

4.4. A ray of light passes through a Prism. By giving a suitable diagram show that < D + < A = < i + < e, where D is angle of deviation, A is angle of prism, i is the angle of incidence and e is the angle of emergence.

4.5. a) state the laws of refraction.
b) why do we say Refractive index of water is 1.33 ?              2+1
OR
a) Write one use of concave mirror.
b) which ray has the highest frequency ?
c) 'Red light suffers less scattering' Why?                         1+1+1

4.6. a) what is Flemming's left hand rule ?
b) Name two safety measures commonly used in electrical circuit and appliances.                1+2

4.7. a) Write one difference between electromotive force and potential difference.
b) 3 resistances 3, 3, 3 ohm arranged in parallel and joined a 2 ohm in series
calculate the equivalent resistance.
c) Two resistors of 2ohm and 3ohm are first connected in series and then in parallel combination. In which combination the equivalent resistance will be smaller than the value of each resistors.    1+1+1
OR
a) how much joule of energy is equivalent to one BOT ?
b) calculate the current through a 200V-60W lamp.
c) Write one advantages of AC over DC.              1+1+1

4.8. Ionising power of Alpha ray is more than Gamma ray. Why ?
b) Why do we use Boron rods in a nuclear reactor ?
c) What are the daughter elements ?          1+1+1

4.9.  Arrange the following elements (Al, Mg, Si, Na) in increasing order of their:
a) atomic size 
b) electronegativity 
c) Ionisation energy.               1+1+1
OR
Give any two points in favour of hydrogen to be placed with the alkali metals. How many elements are present in the second period of periodic table ?                  2+1

4.10. During electrolysis of water--
a) which gases are liberated at cathode and anode ?
b) give the reaction at cathode ?
c) Why acidulated water is used ?    1+1+1

4.11. give the reactions of the manufacture of nitric acid by Ostwald's process.              3

4.12. How can you convert Ethylene to Ethane ?  What is the type of reaction called ?          2+1
OR
a) complete the following reactions
i) CH₃COOH + NaOH -->
ii) CH₃COOH + C₂H₃OH --- (Conc. sulphuric acid 70°- 80°C)
b) Give an example of natural polymer.

  
 MODEL TEST PAPER -1


                 Group A  
1) Multiple choice questions. Four alternative answers are given for each of the following questions.  write the correct one.        1x15=15

1.1) Which of the following is the SI unit of pressure?
A) N-m² B) N-m⁻² C) N-m D) N

1.2) vapour density of a gas is 32. Which of the following is its molecular weight?
A) 8 B) 16 C) 32 D) 64

1.3) On which of the  following does the thermal conductivity of a metal depend ?
A) temperature  B) length C) nature material D) area of the cross section 

1.5) what is the relation between the radius of curvature and the focal length of a mirror ?
A) f= 2r B) f= r/2 C) f= r/3 D) f= 3r/2

1.6) which of the following Colours deviates most when white light is refracted by a prism ?
A) red B) yellow C) violet D) green

1.7) which of the following physical quantities represents ampere?
A) coulomb-second B) volt-ohm⁻¹ C) vt-ohm D) volt⁻¹-ohm

1.8) Resistivity of which of the following decreases with increase in temperature ?
A) conductor B) semiconductor C) superconductor D) insulator 

1.9) Which of the following is the correct order of ionising power for α, β, and γ rays ?
A) α> β> γ  B) α> γ> β C) γ> β>α D) β> α> γ

1.10) Which of the following has the highest atomic radius ?
A) K B) H C) Li D) Na

1.11) In which following a covalent bond is present ?
A) hydrogen chloride B) sodium chloride C) lithium hydride D) calcium oxide 

1.12) Which of the following is a weak electrolyte in aqueous solution?
A) CH₃COOH B) NaOH C) H₂SO₄ D) NaCl

1.13) Which of the following is used to dry moist ammonia ?
A) H₂SO₄ B) P₂O₅ C) CaO D) CaCl₂

1.14) Which of the following is an ore of aluminium?
A) bauxite B) hematite C) malachite D) chalcopyrite d

1.15) which of the following is the functional group of aldehydes ?
A) -OH B) -CHO C) > C= O D) -COOH

               GROUP - B
2) Answer the following questions ( Alternatives are to be notes):
2.1) fill in the blanks:
 in troposphere temperature___ with increase in altitude.                     (1)
OR
 Mention one harmful effect of global warming.

2.2) Which atom, released from a chlorofluoro carbon under the influence of UV rays, decomposes Ozone into oxygen ?                  (1)

2.3) Write whether the following statement is true or false :
under the same condition of temperature and pressure equal volumes of CO₂ and N₂ gas contain different number of molecules.  (1)

2.4) write down the relation between the pressure and volume of a given mass of a gas according to Boyle's law when temperature remain constant.                    (1)

2.5) Between the apparent and real expansion of co-efficients of a liquid, which one is its own characteristic ?                           (1)
OR
What is the SI unit of thermal conductivity ?

2.6) Give a natural example of dispersion of light.                   (1)

2.7)  which type of lens can rectify myopic vision?                            (1)

2.8) What will be the change in the motion of a Barlow's wheel if the direction of the current is the reversed?                                      (1)

2.9) How much work has to be done when a one column of charge is taken against a potential difference of 1 volt ?                   (1)

2.10) From which part of a radioactive atom is Beta- particles emitted?                                      (1)
OR
 what is the atomic number of the daughter element produced if an particle is emitted from ²³⁸₉₂U ?

2.11) Match the column A to B: 
Column A
1. A transition element
2. A transuranium element.
3. Reduces Fe₂O₃ at high temperature in the thermit process.
4. present in the alloy bell metal.
Column B
A) aluminium 
B) Nickel 
C) Tin
D) plutonium                             1x 4

2.12) Draw Lewis dot diagram of F₂ molecule. (F = 9).                     (1)

2.13) Why the electrical conductivity of the solution produced by adding little sulphuric acid into pure water is more than the electrical conductivity of pure water ?
OR
what are the carriers of electricity in the solution during the electrolysis of an aqueous solution of an electrolyte ?                              (1)

2.14) Which ion migrates towards the cathode during the electrolysis of aqueous solution of CuSO₄ using Cu-electrodes.                             (1)

2.15) write down the formula of the black precipitate formed when H₂S gas is passed through an aqueous solution of lead nitrate?
OR
What change of colour is observed when H₂S gas is passed through an acidified aqueous solution of potassium dichromate ?            (1)

2.16) Two substances are used in the production of Urea. One is ammonia, what is the other ?    (1)

2.17) Mention one use of poly (vinyl chloride).                                    (1)

2.18) write down the IUPAC name of CH₃CH₂CH₂OH.                       (1)
OR
Write down the constitutional formula of an isomer of CH₃CH₂OH

                     Group - C

3) Answer the following questions (Alternatives are noted):.     2x 9

3.1) what is the mean by calorific value of a fuel? Between coal and diesel which has greater calorific value?        

3.2) If the volume of a given mass of a gas at STP is 52 m³, what will be its volume at the pressure of 104 cmHg temperature remaining constant ?

3.3) How does the refractive index of a medium depend on the velocity of light ?
OR
What kind of mirror is used in the headlight of a car and why ?

3.4) Mention two advantages of using CFL lamp over an incandescent lamp.

3.5) An aqueous solution of sugar cannot conduct electricity, but an aqueous solution of sodium chloride can. why ?
OR
why is it appropriate to use the term formula weight instead of molecular weight in case sodium chloride ?

3.6) compare the following two properties of naphthalene and sodium chloride: melting point and solubility in water.

3.7) Name a gas which can be prepared in Kipo's apparatus. write the balanced chemical equation of the reaction for the preparation of the gas.

3.8) How is metallic zinc obtained from the zinc oxide ? Write the reaction with balanced chemical equation.
OR
 what happens when a piece of zinc is added to an aqueous solution of CuSO₄ ? Show with the help of electronic theory that this is an oxidation-reduction reaction.

3.9) Show with the help of structural formula ethylene that is an unsaturated hydrocarbon.
OR
 what is denatured spirit ?

                  Group - D

4) Answer the following questions (Alternatives are to be noted):

4.1) State Charles' law related to gases and represent it graphically (V vs t).                                          (3)

4.2) How many gram of ammonium Sulphate will be required to prepare 6.8g of ammonia by heating Ammonium Sulphate with caustic soda solution ?
OR
 CaCl₂ , CO₂ and  H₂O are produced by the reaction of dilute HCl with CaCO₂, How many gram of HCl will be required to prepare 55.5g of  CaCl₂, 22.0g of CO₂ and 9.0 of H₂O from 50.0g of CaCO₃ ? What is the number of mole of HCl required? (,H= 2, Cl= 35.5).                  2+1

4.3 What is the volume expansion coefficient of a gas at fixed pressure? What is its value?     2+1
OR
Mention two similarities between heat conduction and electrical conduction, Mention a nonmetal having high thermal conductivity.
 
4.4) State the two law of refraction of light. Write also the mathematical form of the second law.                      (2+1)

4.5) In case of concave mirror find the relationship between focal length and the radius of curvature.
OR 
A ray of light passes through a prism. Show that the angle of  deviation
δ= i₁ + i₂ - A. (Symbols have usual meaning).                                (3) 
4.6) Write Faraday's law of electromagnetic induction. What is meant by alternating current ?    2+1

4.7) An electric bulb resistance 440 ohm is connected to 220 volt mains for 10 hours. Find the amount of electrical energy consumed in BOT unit.   (3)
Oar
A metal wire resistance 6 ohm is stretched to so that its length becomes double of its original length. What would be the final resistance ?               (3)

4.8) What is mean by mass defect ? what is the source of energy released in nuclear fusion ?  2+1

4.9) write with an example what is mean by periodic property of elements ? Mention a property which is not periodic.           2+1
OR
What is the meant by electronegativity of an element ? How does electronegativity of Group 1 elements of the long periodic table change from top to bottom ?

4.10) which energy responsible for the chemical reaction to occur during electrolysis ? what reaction do occurr at the cathode and the anode during electrolysis of acidulated water ?         1+2

4.11) Write balance chemical equation with conditions for the industrial manufacture of SO₃ from SO₂ by the contact process. How is H₂SO₄ prepared from the SO₃ produced ?           2+1

4.12) Write balanced chemical equation of the addition reaction of hydrogen with acetylene mentioning the conditions of reaction. Mention one use of LPG.
OR
 how do you convert ?
CH₃CH₂OHCH₂ = CH₂
How is biopolymer protein biodegradaed in nature ?           2+1