Question

Camphor is purified by the process of –
(a) evaporation (b) distillation (c) sublimation (d) filtration
2. Which of the following has highest kinetic energy?
(a) Particles of ice at 0 °C (b) Particles of water at 0 °C
(c) Particles of water at 100 °C (d) Particles of steam at 100 °C
3. LPG is used in the kitchens in our homes in the-
(a) Solid form (b) compressed form (c) gaseous form (d) none.
4. Which of the following is most suitable for summer?
(a) Cotton (b) Nylon (c) Polyester (d) Silk
5. Which of the following does not affect rate of evaporation?
(a) Wind speed (b) Surface area
(c) Temperature (d) Insoluble heavy impurities
6. Kinetic energy of molecules is directly proportional to
(a) Temperature (b) Pressure
(c) Both (a) and (b) (d) Atmospheric pressure
7. Which of the following will not sublime –
(a) Camphor (b) ammonium chloride (c) bromine (d) iodine
8. The states of matter can be changed by changing –
(a) Temperature (b) pressure
(c) both (a) and (b) (d) none of these.
9. The amount of heat energy required to change 1 kg of solid into liquid at its melting
point is called –
(a) Melting point (b) latent heat of fusion
(c) boiling point (d) latent heat of vaporization.
10.Which of the following is accompanied by cooling –
(a) Vaporization (b) evaporation (c) condensation (d) none of thes

Answer 1

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1) (c) sublimation

2) (d) Particles of steam at 100 °C

3) (b) compressed form

4) (a) Cotton

5) (d) Insoluble heavy impurities

6) (a) Temperature

7) (c) bromine

8) (c) both (a) and (b)

9) (b) latent heat of fusion

10) (b) evaporation

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