ICSE - PHYSICS (TEST PAPER) (VIII)

1) Fill in the blanks: (any 8).      (1 x8=8)

a) In charging by induction method, the charge acquired by the neutral object is said to be _____charge.

b) The amplitude of the harmonics will always be____ then the amplitude of the fundamental.

c) The SI unit of coefficient of thermal expansion is_____ .

d) When the object is at infinity, its image is formed at the ____of the concave mirror.

e) ______of a sound depends on the amplitude of the wave.

f) A water droplet is optically ____then air around it.

g) 1 kgf m= ______

h) The atmospheric pressure _____with altitude.

i) The mass per unit volume is termed as______ .

j) Solids have the____ intermolecular space of all the states of matter.

2) State whether the following statements are true or false. Correct the false statements.   (Answer any 8).   (1 x8=8)

a) An electroscopes gives information about the electrons only.

b) Sound propagates only in front direction of the source.

c) Railway tracks expand in winters and contract in summers.

d) A convex mirror always forms a magnified image behind the mirror.

e) Eoller coaster ride is an example of energy transformation.

f) The frequency of a buzzing mosquito is lesser than the roaring of a lion.

g) The blood in our body has the same pressure as atmospheric pressure.

h) For determining the relative density of a liquid, Eureka Can is used.

i) When the heat is supplied to the matter, its a molecules gain energy and start  vibrating vigorously.

3) Choose the correct option (Answer any 8)    (1 x8=8)

a) Conductors have___

i) no free electrons 

ii) a few number of electrons.

iii) a large number of free protons.

iv) a large number of free electrons.

b) Timber is the other name used for ____

i) loudness  ii) pitch iii) frequency iv) quality

c) Which of the following produces a cooling effect ?

i) evaporation ii) condensation iii) fusion iv) deposition

d) The image found by a convex mirror is always____

i) virtual and erect  ii) real and inverted iii) virtual and inverted iv) real and erect

e) In a dry cell , the____ energy gets converted into ____energy.

i) chemical,electrical 

ii) electrical, light 

iii) electrical, chemical 

iv) light, electrical

f) Which of these is not true about a thundercloud ?

i) Charges within a thundercloud get separated due to water vapour.

ii) A thundercloud carries static charges.

iii) The upper part of the cloud carries positive charges.

iv) The lower part of the cloud carries negative charges.

g) The pressure exerted by a liquid on the walls of the container is called ___

i) upthrust  ii) atmospheric pressure iii) lateral pressure iv) surface tension

h) Relative density is also termed as ____

i) specific density ii) specific mass iii) specific gravity iv) specific weight

i) On cooling down a substance, there is a loss of heat and the kinetic energy of its molecules.

i) increases  ii) decreases iii) remains the same iv) none of these

4) Match the columns. (1 x8=8)

a) Earth wire

b) Shrill sound 

c) deposition 

d) kinetic energy

e) energy transformation 

f) pycnometer

g) sublimation 

h) live wire

i) earth wire

a) Green 

b) High frequency

c) Low frequency 

d) Snow formation

e) Change in volume on heating 

f) Moving wind 

g) Specific gravity bottle 

h) Dry ice

i) Brown

j) Green

j) White 

5) DEFINE: (Answer any 8).  (1 x8=8)

1) Electrostatic force

2) Electroscope

3) Oscillation

4) Thermal expansion

5) Lateral displacement.

6) focal length

7) mechanical energy

8) Thrust

9) Density

10) force of cohesion 

6) Difference between the following: (any five):    (2 x5=10)

a) work/power

b) conductor/insulator

c) Loudness/ pitch

d) floating/ sinking

e) fusion/ solidification

f) music/noise

7) Reason behind the following:(any 5).     (2 x5=10)

a) The sounds produced by a piano and a Guitar are different.

b) A normal glass tumbler cracks when dipped in boiling water.

c) Concave mirrors are used as shaving mirrors.

d) The power of an air conditioner is greater than a fan.

e) A sledge is used in snow covered areas.

f) The solids have the highest density.

g) Why do we smell hot food from a distance.

8) Numerical Questions: (any two).     (2.5 x2= 5)

a) A car has a kinetic energy of 2000 J. What will be its kinetic energy if speed is doubled?

b) A vacuum cleaner is rated at 650 watt. How much electrical energy will it consume in 13 days if it is used for 1.5 hours daily.

c) A worker does 150 j of work by dragging a sack of cement with the force of 60 N. Find the displacement of the sack.

9