Online test of Chapter 1 Matter in our Surrounding 3 Science| Class 9th

Questions :

1. The boiling points of the liquids decrease in the following order:
B.P of water > B.P of kerosene > B.P of alcohol > B.P of petrol.
Which of the following order is correct for decreasing rate of evaporation?
(a) water > alcohol = kerosene > petrol
(b) petrol > alcohol > kerosene > water
(c) remains same in all liquids
(d) water > kerosene > alcohol > petrol

2. Solids cannot be compressed because:
(a) constituent particles are very closely packed
(b) inter particle attractive forces are weak
(c) movement of constituent particles is restricted
(d) constituent particles diffuse very slowly.

3. The melting point of a solid is an indication of
(a) its rigidity
(b) its shape
(c) the strength of the force of attraction between its particles
(d) its ability to intermix with other solids

4. The intermolecular attractive forces is minimum in
(a) liquids
(b) solids
(c) gases
(d) all of these

5. During summer, water kept in an earthen pot becomes cool because of the phenomenon of
(a) diffusion
(b) transpiration
(c) osmosis
(d) evaporation

6. Which of the following are the characteristics of gaseous state?
(a) closely packed, incompressible, fixed shape
(b) highly compressible, no fixed size and shape
(c) fixed size and shape, incompressible
(d) fixed volume, compressible, definite shape

7. The quantity of heat required to change unit mass of a solid into liquid at atmospheric pressure at its melting point is called
(a) latent heat of vaporisation.
(b) latent heat of fusion.
(c) latent heat of sublimation.
(d) latent heat of evaporation.

8. When ice melts to water, heat is
(a) evolved.
(b) absorbed.
(c) no change
(d) evolved or absorbed depending upon the conditions.

9. In the sublimation process:
(a) solid changes directly to the vapour state
(b) solid initially melts and then changes to vapour state
(c) liquid changes to vapour state
(d) none of the above

10. Evaporation of a liquid occurs at
(a) its boiling point.
(b) room temperature.
(c) all temperatures.
(d) a temperature higher than its boiling point.