Current Electricity
R-1
1) Charge of an electrons is:
a) - 3.2x 10⁻¹⁹C
b) - 1.6 x 10⁻¹⁹C
c) 1.6 x 10⁻¹⁹C
d) 3.2x 10⁻¹⁹C
2) if the resistance(R) of the conductor and time of flow of current in the conductor(t) remain unchanged , the relation between the heat produced(H) in the conductor and flow of current(I) is
a) H ∞ I b) H ∞ 1/I² c) H ∞ I² d) H ∞ 1/I.
3) If 12C of charge flows through a conductor for 2 minutes, the electric current is
a) 6 ampere b) 0.1ampere c) 24 ampere d) 10 amperes
4) Coulomb's law related to electric charges is applicable when of the two charges
a) one is point, one is Spherical
b) both the spherical
c) one is point, one is extended
d) both are points
5) The characteristics of a fuse wire are
a) high resistance, high melting point
b) low resistance, low melting point
c) low resistance, high melting point
d) high resistance, Low melting point
6) Temperature remaining unchanged, if the potential difference between the two ends of a conductor is V and the current through the conductor is I, which of the following is true ?
a) V ∞ I b) V ∞ I² c) V ∞ I⁻¹ d) V ∞ I⁻²
7) The relation among the electromotive force(V), work (W) and charge(Q) is
a) Q= WV b) Q= V/W c) Q= V/W² d) Q= W/V
8) Which of the units given below is the SI unit of resistance ?
a) volt b) ampere c) coulumb d) ohm
9) In domestic electric circuit the fuse wire is connected to which is the following ?
a) earth line b) live line c) neutral line d) both live and neutral lines.
10) Which of the following physical quantity represent ampere ?
a) coulumb second
b) volt. ohm⁻¹ c) volt. ohm d) volt⁻¹ ohm
11) Resistivity of which of the following decreases with increase in temperature ?
a) conductor
b) semiconductor
c) superconductor
d) insulator
12) With increase in temperature, the resistivity of a metallic conductor -
a) does not increase
b) increases
c) does not increase
d) decreases.
13) Which principle is abided by Lenz's law ?
a) conservation of energy
b) conservation of mass
c) conservation of momentum
d) conservation of charge.
14) A potential difference of 20 volts applied across the ends of a conductor enables 20 coulumbs charge flow through it in 5 seconds . What is the resistance of the conductor.
a) 3 ohms b) 4ohms c) 5ohms d) 6 ohms
15) The emf of a sample voltage cell is
a) 1.08 b) 2.36 c) 3.46 d) 7.78
16) Commercial unit of electrical energy is
a) BOT b) volt c) coulumb d) ampere
17) The core of an electromagnet is made of
a) alnicu b) steel c) soft iron d) none
18) Material of a fuse wire is
a) Copper b) an alloy c) semiconductor d) an insulator
19) In electric motor electric energy is converted to____ energy.
a) mechanical b) sound c) heat d) chemical
20) The SI unit of potential is
a) ampere b) volt c) gauss d) siemens
21) The product of the total number of tuns in a solenoid aystrength of current in ampere is called
a) reverse ampere
b) ampere turn
c) pole strength d) none
22) Chemical energy Converts to___ energy into a voltaic cell.
a) sound b) electrical c) heat d) nuclear
23) The unit of potential difference is
a) joule b) volt c) ampere d) coulumb.
24) Same current flows through conductor. If the resistance of one is 4 times than that of the other, then the ratio of potential difference established in the two is
a) 4:1 b) 1:4 c) 8:1 d) 1:16
25) What magnitude of the current flow through a conductor of resistance 8 Ohm's when it is connected to a battery of emf 2 volts ?
a) 16 ampere
b) 0.25 ampere
c) 5 ampere
d) 10 ampere
26) What is the effective resistance of the resistance 2 Ω,4Ω and 5 Ω connected in parallel
a) 11 Ω b) 2Ω c) 4 Ω d) 1.05Ω
27) in a Circuit, 2 Ω and 3Ω resistors are connected in series to the parallel arrangement of 2 Ω and 3Ω resistors. What is the resistance in the circuit ?
a) 10Ω b) 6.2Ω c) 6.2 Ω d) 15Ω
28) The colour of the earthing wire is
a) black or green
b) green or yellow
c) yellow or blue
d) green or black
29) Which quantity expresses the work done by an electrical instrument ?
a) I²R b) I²Rt c) I²Rt/J d) VI
30) 1 volt is equals to
a) 1C/1J b) 1J/1C c) 1A/1J d) 1J/1A
31) With increase in temperature, the resistance of a semiconductor
a) increases b) decreases c) remains the same d) becomes half of its value
32) I₁, I₂, I₃ are amounts of current flowing through three resistance R₁, R₂ and R₃ (R₁ > R₂ > R₃) connected in parallel. The relation among I₁, I₂ and I₃ is
a) I₁= I₂> I₃
b) I₁> I₂> I₃
c) I₁< I₂< I₃
d) I₁> I₂< I₃
33) The filament in an electric lamp has____ resistance.
a) high
b) medium
c) low
d) none
34) 1Hp is
a) 476W b) 746W c) 764 W d) 647 W
35) 1 BOT is
a) 1W-h b) 1kW-h c) 1MW-h d) 1mW-h
36) Equivalent resistance of two resistances 3 Ω and 6Ω connected in parallel will be
a) 3Ω b) 6Ω c) 4.5Ω d) 2Ω
37) Electric power is expressed by
a) VI b) V²I c) VI² d) VIT
38) The unit of current is
a) joule b) volt c) ampere d) coulumb
39) Unit of charge in SI system is
a) coulumb
b) ampere
c) Henry
d) Ohm
40) 0.55 ampere current flow through an electric bulb of 400 ohm resistance when it is connected in a line of electric supply. What is the emf of the line ?
a) 550 volts b) 440 volts c) 220 volts d) 1320 volts
CURRENT ELECTRICITY
1) A conductor of resistance 4 Ω can pass a current up 2.5 A through it. Calculate the potential difference required across the conductor. 10V
2) Calculate the amount of work done in moving a charge of 5 C through a potential difference of 25V. What will be the potential difference if this amount of work is done in moving a charge of 10C ? 12.5V
3) A metallic wire of length 1m is stretched to double its length in such a way that there is no change in density of the wire . Calculate the ratio of the final resistance. 1:4
4) A wire of length 15m and uniform cross section of 6x 10⁻⁷m² has a resistance of 5Ω. Calculate the resistivity of the material of the wire. 2 x 10⁻⁷Ωm
5) When a potential difference of 4V is applied across the ends of a wire of 10m length, a current of 2A flows through it. Calculate
a) the resistance per unit length of the wire. 0.2Ω m⁻¹
b) the resistance of 4m length of this wire. 0.8Ω
6) A battery supplies a current of 0.8 A through a 2Ω resistor and a current of 0.4A through a 5Ω resistor. Calculate the internal resistance of the battery. 1Ω
7) What will be the equivalent resistance of three resistors of 4Ω, 8Ω and 16 Ω if these are connected in
a) series. 28Ω
b) parallel. 2.28Ω
8) A lamp of resistance 800 Ω, a fire alarm of resistance 30 Ω and a vacuum cleaner of resistance 200Ω are connected in parallel to the mains supply of 240 V. Calculate the current through each appliance and the total current supplied by the mains. 9.5A
9) The effective resistance of two resistors is 25Ω. If the resistance of one of the resistors is 10 Ω, what is the resistance of the other resistors ? 15Ω
10) The effecttive resistance of three resistors connected to a battery is 5 Ω. If R₁ = 10Ω, R₂ = 15Ω, what will be the value of R₃ ? Draw a circuit diagram with the flow of current across each resistor. 30Ω
11) A parallel pair of resistors of values 4Ω and 12 Ω are together connected in series with another resistors of value 3 Ω and battery of emf 24 V. Draw a circuit diagram and calculate the current across each resistor . 3A, 1A
12) The figure below shows
V-I graphs of two metallic conductors for series and parallel combination. Which graph represents parallel combination ?
13) The lengths of three conducting wires of same materials are in the ratio 1:2:3. The area of cross section of each wire is same, if these wires are joined in parallel across a battery, what will be the ratio of the currents in them ? 6:3:2
14) In the given circuit diagram,
the emf of the cell is 5 V and its an internal resistance is 2.5 Ω. Calculate the current flowing in the circuit. 0.67A
15) Find the current flowing through the given circuit connected to a cell of supply 5V. 
3.75A
16) From the circuit flow diagram given below,
Calculate the current flowing through the circuit. 0.67A
17) Three resistors of 8Ω, 4 Ω and 2 Ω are connected together in such a way that the total resistance is greater than 8Ω but less than 10 Ω. Suggest a suitable arrangement of how these resistors can be possibly combined and calculate the total resistance. 9.33Ω
18) In the given diagram,
A₁, A₂ and A₃ are three ammeters of negligible resistance. The reading of ammeter A₃ is 1A. Calculate
a) the readings of ammeter A₁ and A₂. 3A
b) the total resistance of the circuit. 2Ω
19) The diagram below
shows three resistors of 5Ω, 8Ω and 10Ω connected to a battery of emf 10V. Calculate
a) the potential difference across the parallel resistors 8Ω and 10Ω. 4.7V
b) the current through 8Ω resistors. 0.59A
20) A cell of emf 2.5 V and internal resistance 1.5 Ω is connected to resistors of 5 Ω and 15Ω in series. Draw a circuit diagram and calculate
a) the current in the circuit. 0.116A
b) the potential difference across each resistor. 1.74V
c) the total potential difference across the cell. 2.32V
21) An electric motor draws a current of 5 A from a 220V line. Determine the power of the motor and the energy consumed in 2 hour. 7.92 x 10⁶J
22) A heater has a power of 1.1 kW at 220V.
a) Find the resistance of the heater. 44Ω
b) Calculate the energy in kWh consumed in a week if the heater is used daily for 4h. 30.8 kWh
23) An electric heater draws 5A of current for 10 minute when connected to 230V power supply. Find the heat energy developed. 690 kJ
24) Find the current flowing through an electric bulb rated as 100W, 220V when connected to a 110 V supply. What will be the power consumed now? 25W
25) Three bulbs, A, B and C, are connected in parallel across 110V source . The rating of bulb is 5oW, 110V, bulb B is 20W,110 V and bulb C is 100 W, 110V
a) Calculate the current flowing in each bulb. 0.45A, 0.18A, 0.9A
b) Which bulb will glow the brightest ? C
26) Two resistors with resistance R₁ = 5Ω and R₂=7Ω are connected in series across a battery of emf of 16V. Draw a circuit diagram and find
a) the electrical energy consumed by each resistor in 30 second.265.33J, 371.47 J
b) total power developed in the circuit. 21.28 W
27) In the previous example, if the resistors are connected in parallel instead of series, what would be the electrical energy consumed by each resistor. Draw a circuit diagram for the same. 1536 J, 1097.14 J
28) two bulbs are rated as 40W, 220 V and 40W, 110 V, respectively. Compare the resistance of two bulbs. 4:1
29) A geyser is rated 1.5kW, 250V. It is connected to 250V mains. Calculate
a) the current drawn by the geyser. 6A
b) electrical energy consumed in 10h in joules. 54 x 10⁶ J
c) cost of energy consumed at Rs3.50 per kWh. Rs52.50
30) Four tube lights of 40 W each, two fans of 100W each and three bulbs of 60W each operate on an average of 8h per day. If the cost of energy is Rs2.50 per kWh, calculate the monthly bill. Rs324
IONIC AND COVALENT BONDING
1) For which of the following ionic compounds no ion has octate ?
a) LiH b) CaO c) NaCl d) MgCl₂.
2) The solid state of which the following compounds in not composed of molecules ?
a) sugar b) glucose c) sodium fliuoride d) hydrogen chloride.
3) In which of the following compounds there is no existence of molecules ?
a) hydrogen chloride b) calcium oxide c) Methane d) Ammonia
4) Solid state of which of the following compounds is compose a ions.
a) sodium chloride b) hydrogen chloride c) naphthalene d) glucose
5) In which of the following a covalent bond is present?
a) Hydrogen chloride b) sodium chloride c) lithium hydride d) calcium oxide
6) Which statement is false about covalent compounds ?
a) they are non electrolytes.
b) chemical reactions between them occurs slowly .
c) these are usual liquid, gaseous or soft solids.
d) none.
7) Which one of the following is a Covalent molecule ?
a) MgCl₂ b) CaO c) NaCl d) CH₄
8) The type of bond that can be formed between elements of group 1 and 17 is-
a) covalent b) non-covalent c) polar covalent d) ionic
9) _____ of an element is the number of valence electrons, lost, gained or shared by one atom of the element to attain stable electronic configuration similar to its nearest element in the periodic table.
a) atomic number b) mass number c) valency d) none.
10) The covalent compound which is widely used for daily domestic purpose is-
a) alum b) water c) washing soap d) washing soda.
11) Which molecules among the following contains triple bond ?
a) CH₄ b) C₂H₄ c) C₆H₆ d) C₂H₂.
12) How many covalent bonds can possibili be formed between two atoms of nitrogen
a) 2 b) 1 c) 4 d) 3.
13) Which one of the following ionic compounds is insoluble in water ?
a) CH₃COOH b) NaNO₃ c) CuSO₄ d) CuCO₃
14) Which one of the following contains covalent double bond?
a) CO₂ b) NH₃ c) H₂O d)CH₄
15) What type of chemical bonding is formed by actual transparence of electrons.
a) electrovalent b)!covalent
c) depends on the number of valence electrons
d) none
16) which statement is false about electrovalent compounds?
a) they are formed by strong attractive electrostatic forces between ions opposite charge
b) they are usually solid
c) they are electrolytes d) none.
17) How many electrons does a hydride ion contain ?
a) two b) 3 c) 0 d) 4 d) 2
18) Which one of the following is an ionic compound ?
a) table salt b) table sugar c) acid d) petrol.
19) which one of the following covalent compounds possesses high melting points ?
a) SiO₂ b) C₃H₈ c) C₆H₆ d) CO₂
SHORT QUESTIONS
1) Show the conventional representation of H₂O molecules by 'dash' sign.
2) The electronic configuration of hydride ion is (H⁻) is like the electronic configuration of the atom of which element ?
3) Draw the Lewis dot diagram of H₂ molecule.
4) Give example of covalent liquid. water
5) b7etween chloroform and the sodium chloride which is not soluble in water?
6) Draw the Lewis dot structure of N₂ molecule.(atomic number of N is 7)
7) What is used as a cathode in electroplating silver over a copper spoon ?
8) Give example of a compound whose aqueous solution is a weak electrolye.
9) Draw Lewis dot diagram of F₂ molecule. (F= 9)
10) Name an electrovalent compound.
11) Name the type of valency where electrons are shared.
12) Name a covalent compound.
13) Name a compound which has both electrovalent and covalent bonds.
14) What type of compound is found by the combination of Na and F ?
15) Define valence electron.
16) who introduced dot symbols to represent the valence electrons in an atom ?
17) which is the nearest inert gas in Hydrogen ?
18) Which gases covalent compound conducts electricity by onising water?
19) Why do ionic compounds not conduct electricity in solid state ?
20) Name a compound with a single covalent bond which is liquid at normal temperature and also known as universal solvent .
21) How many loan electron pairs are present in nitrogen ?
22) Give one property hydrogen chloride which agrees with it being a covalent compound.
23) What do you mean by valency orbit (or shell)?
24) What is the type of Valency that result from sharing of electrons pair or pairs between two atoms ?
25) What kind of elements have a tendency to form covalent bonds ?
26) What is octet configuration ?
27) Name a covalent compound is becomes electrovalent when dissolved in water.
28) What type of covalent compounds dissociate into ions and conduct electricity ?
29) Give an example of a substance having carbon -carbon (C-C) covalent bond.
30) By which type of chemical bond does carbon combine with hydrogen to form methane ?
31) in which type of bond electron shift occurs ?
32) why are electrovalent compound journally solid ?
33) covalent compounds are soluble in polar solvent. Why are sugar and glucose like covalent compounds soluble in water ?
CELL DIVISION AND CELL CYCLE
1) The name of terminal parts of chromosome is
a) centromere b) telomere c) nucleolar organiser d) satellite b
2) Select the correct pair in case of human:
a) Normal pattern of the chromosome of ovum --22A+ XX
b) Normal pattern chromosome of ovum --22A+ Y
c) Normal pattern of chromosome of ovum --22A+ X
d) Normal pattern of chromosome of ovum --22A+ XY c
3) Select the correct pair-
a) Telophase -- Movement of daughter chromosomes towards piles
b) Telophase --Disappearance of Nuclear Membrane and Nucleolus
c) Telophase -- Formation of spindle fibre
d) Telophase -- Reappearance of Nuclear Membrane and Nucleolus d
4) Determined from the answers given below in which phases of Karyokinesis during mitotic cell division following two incidents happen --
A) daughter chromosomes tend to move apart from each other towards their own poles
B) nuclear membrane and nucleolus disappear
a) A. Prophase B. Anaphase
b) A. Anaphase B. Prophase
c) A. Telophase B. Metaphase
d) A. Metaphase B. Telophase b
5) Determine the number of DNA molecules that get coiled to form each chromosome in a newly formed daughter cell produced by mitotic cell division in human body--
a) 46 b) 1 c) 23 d) numerous b
6) identify the correct feature of Amitosis cell division
a) occurs in germs mother cell of sexually reproducing organism
b) it is called indirect cell division
c) chromosome and spindle fibre are formed
d) chromosomes and spinal fibre are not formed d
7) In which stage of mitosis cell division, the nuclear membrane and nucleolus are seen to disappear ?
a) Anaphase b) prophase c) metaphase d) telophase b
8) Which of the following is not structural component of DNA ?
a) deoxyribose sugar
b) Uracil base
c) Thymine base
d) phosphoric Acid b
9) you have observed the separation of two sister chromatids at one stage of mitotic cell division. The stage is
a) Prophase b) telophase c) anaphase d) metaphase c
10) The components of genes are
a) sugar+ nitrogenous base + H₂SO₄
b) protein+ nitrogenous base+ H₃PO₄
c) Sugar+ phosphate base+ H₂CO₃
d) Sugar+ Nitrogenous base + H₃PO₄ d
11) The movement of chromatid towards the pole is the characteristic of
a) anaphase b) prophase c) metaphase d) telophase a
12) The telomeric part of chromosome is
a) satellite b) centromere c) NOR d) telomere a
13) Mitosis is a
a) reduction division
b) first redectional and then equal division
c) first equal and then reductional division
d) equal division d
14) The connection of Kinetochore of chromosome with spindris fibre takes place during
a) metaphase b) anaphase c) prophase d) telophase. b
15) What kind of cells will be formed after meiotic cell division of a diploid cell and in what number ?
a) 2 diploid cells
b) 4 haploid cells
c) 4 diploid cells
d) 2 diploid cells and two haploid cells. b
16) Which of the following is the characteristic of interphase ?
a) Movement of chromatid towards the pole
b) The arrangement of chromosomes along the equatorial plate
c) duplication of DNA
d) formation of spindle fibre c
17) Which of the following acids is present in DNA ?
a) carbonic acid b) acetic Acid c) pyruvic acid d) phosphoric acid
18) The duplication of DNA takes place in
a) M phase b) G₁ phase c) S phase d) G₂ phase c
19) The process of formation of bivalent of homologous chromosome is
a) synapse b) synapsis c) crossing over d) metakinesis b
20) Which of the following is not the nitrogen base of RNA ?
a) ribose b) Uracil c) adenine d) Thymine. d
21) Which of the following gets attached to DNA to form euchromatin?
a) neutralized histone protein
b) acidic non-histone protein
c) basic histone protein
d) basic non-histone protein c
22) Which of the following is the characteristic of mitotic cell division ?
a) 2n ---> 2n --> 2n
b) 2n ---> n --> 2n
c) 2n ---> 4n --> 4n
d) 2n ---> n --> n a
23) Which of the following is correct ?
a) G + S= interphase
b) S+ G₂ = interphase
c) G₁+ G₂ = interphase
d) G₁+ S+ G₂ = interphase. d
24) Meiotic cell division does not takes place in
a) Spore mother cell
b) Gamete mother cell
c) Embryonal axis
d) Zygote d
25) Which of the following is not the character of Euchromatin?
a) in non-divisional phase it takes light stain and in divisional phase it takes deep stain
b) the inactive part of chromatin
c) the active part of chromatin
d) it takes part in protein synthesis through RNA organization a
26) the chromosome number in gamete is
a) 2n b) 3n c) n d) 4n. c
27) in a Cell 25 centromere are present, then what will be the chromosome number ?
a) 10 b) 50 c) 25 d) 100 c
28) Which of the following does not take place in telophase
a) the reappearance of nuclear membrane from chromatid
b) Reappearance of nuclear membrane and nucleolus
c) Disappearance of spindle fibre
d) The movement of Centrioles towards the pole d
29) Which of the following is not correct about cytokinesis in animal cell ?
a) cell plate formation takes place
b) the daughter cells go away from each other
c) there is no rule of Golgi bodies
d) cleavage formation takes place a
30) Which of the following is not the character of sex chromosome ?
a) it is 2 in number in case of human beings
b) it determine sex in human beings
c) in determines physical features in human beings
d) it is XX in case of women and XY in case of man c
31) The third phase of Karyokinesis is
a) metaphase b) anaphase c) prophase d) telophase a
32) The number of phases of development in human beings is
a) 4 b) 3 c) 5 d) 2 c
33) Which of the following helps to organise spindlr formation ?
a) centriole b) nucleus c) ribosome d) mitochondria a
34) you have not observed the formation of any spindle fibre during the division of a cell. This type of division is called
a) Amitosis b) first meiotic division c) second meiotic division d) mitosis a
35) Which of the following is not a Pyrimidine ?
a) Guanine b) Uracil c) Thymine d) Cytosine. b
36) What is the number of autosomes in human somatic cell ?
a) 44 b) 46 c) 23 d) 22 a
37) In a DNA molecule the complementary base pair of Guanine is
a) adenine b) cytosoc) Thymine d) Uracil. a
38) Amitosis is found in
a) Amoeba b) RBC c) plant cell d) reproductive mother cell a
39) Which of the following is the sugar of DNA ?
a) glucose b) cellulose c) deoxyribose d) ribose c
40) Which of the following is not the character of meiosis ?
a) takes place in reproductive cells
b) the reproductional division of chromosome takes place
c) 2 cells are produced
d) 2 cells are produced
41) Which of the following is the characteristic of of metaphase ?
a) dehydration
b) disappearance of nuclear membrane and nucleolus
c) arrangement of chromosome in equatorial plate
d) Arrangement of chromosome in equatorial plate.
PERIODIC TABLE
A) Choose the correct Option
1) Number of groups in the long periodic table is
a) 9 b) 13 c) 18 d) 19
2) thre order of oxidizing property of Cl(17), I(53), F(9), Br(35) belonging to group 17 of long periodic table is
a) F< Cl< Br< I
b) Cl > I >F > Br
c) Cl > F > Br > I
d) F>Cl >Br >I.
3) Which of the following is not periodic property of elements ?
a) density b) melting point c) boiling point d) radioactivity
4) To which group of the long periodic table do the halogen elements belong ?
a) group 1 b) group 16 c) group 17 d) group 2
5) Which of the following has the highest atomic radius ?
a) K b) H c) Li d) Na
6) Which group's elements of Mendeleev's periodic table are most electropositive ?
a) VII v) I c) 0 d) III.
7) Which one of the following is not a reason for keeping hydrogen in Group I A?
a) hydrogen is electropositive
b) valency of hydrogen is 1
c) hydrogen is a non metallic element
d) hydrogen is a non metallic element.
8) A strong oxidizing element present in the second period of periodic table is
a) F b) Cl c) Br d) O
9) In a group of periodic table, elements are of____physical and chemical properties.
a) different b) same c) both a and b d) none
10) A hydrogen atom may transform to a negative hydride ion by capturing one--
a) electron b) proton c) neutron d) photon
11) Who established the law stating 'Chemical properties of an element depend on the atomic number of the element and not on the atomic mass ?
a) Lothar Meter b) Mosley c) Mendeleev d) Newland
12) Which group of Mendeleev's periodic table contains alkali metals ?
a) I b) II c) III d) IV.
13) An element can be placed in group I -A along alkali metal with alkali metals and also in group VII -B along with halogen and is also called as ' Rogue element '. The name of the element is
a) hydrogen b) fluorine c) chlorine d) bromine
14) Which group's element of Mendeleev's periodic table are called bridge elements?
a) I b) II c) III d) 0
15) An element present in 3rd period and in group -13 is
a) liquid and metallic
b) a good conductor
c) solid and non metallic
d) solid and neutral
16) Which one of the following processes the highest density ?
a) Osmium b) Mercury c) Tungsten d) Helium
17) A pair of alkaline earth metal is
a) Sodium and potassium
b) caesium and Francium
c) lithium and radium
d) calcium and strontium.
18) In a period of periodic table, elements are in ascending order of
a) atomic number
b) atomic mass
c) atomic weight
d) mass number
19) Which one of the following insert gases is radioactive?
a) krypton b) argon c) radon d) xenon
20) Radioactive element among halogens is
a) chlorine b) astatin c) flulorine d) iodine
21) Which pair of elements among the following belong to the same period?
a) Na, Cl b) Na, Ca c) Na, Cl d) Br, Cl
B) One word Answer
1) Arrange F, I, Br, Cl in decreasing order of electronegativity.
2) In which group of long periodic table, elements of all 3 physical state gaseous, liquid and solid are present ?
3) To which group of long periodic table do the alkali metals belong ?
4) What type of chemical bond is present in CaO?
5) Which element bears diagonal relationship with metal Be?
6) State one limitation of Deboeriner's law of Triads.
7) Name the noble gas having the duplet arrangement of the electrons.
8) What is the number of electron shells in elements of period of 3?
9) Arrange S, P, Cl and Ar in order of increasing non metallic characters.
10) Which one among Li, Na and K has the least number of electron shells ?
11) Name the elements from the elements C, O, N, F having the maximum nuclear charge.
12) Name the last three elements of period two of the periodic table in increasing order of their atomic number.
13) Name an element whose electron affinity is zero.
14) Name the halogen whose electronic configuration is 2, 7.
15) Name an element of group I A other than Sodium.
16) Name an element of group VII B which is solid at room temperature.
17) Arrange Cl, Mg, P, Na in decreasing order of atomic size.
18) Define periodic properties.
19) Give two examples of Periodic Properties.
20) Arrange the elements Na, Al, Mg and S in increasing order of electropositivity.
21) State the position of magnesium.
22) After how many elements are the properties repeated in the cases of the second and the third periods ?
23) Name a light metal and a heavy metal.
24) Name two transition elements.
25) Name two Radioactive elements.
26) Name two representative elements.
27) When did Deboeriner give his law of Triads.
28) Who gave the law of octaves.
29) Mention the use of transition elements Tantalum(Ta).
30) Arrange I, Cl, Br in increasing order of their electronegativity.
31) Which elements of the periodic table are called representative elements ?
32) Between K and Ca atom -- which one is larger in size?
33) What name was given to Eka-silicon when the new element was discovered?
34) Name two elements in which both the metallic and non metallic properties are observed.
35) Name the alkali metals and the halogen in period 2 and 3.
36) How many groups and periods are there in the modern version of Mendeleev's periodic table?
37) Define coinage metal.
