MATTER IN OUR SURROUNDINGS

1. In all the three states of water, (i.e. ice, liquid and vapour) chemical composition of water

• (a) is very different

• (b) remains same

• (c) sometimes same and sometimes different

• (d) none of the above

2. Which of the following statements is incorrect about the state of matter?

• (a) The force of attraction between the gas particles is very less.

• (b) Plasma consists of super energetic and super excited particles.

• (c) The plasma glows with a special colour depending on the nature of the gas.

• (d) Bose-Einstein condensate is formed by heating gas of extremely low density.

3. Which of the following is not a property of gas?

• (a) Gases have a definite shape

• (b) Gases have no definite volume

• (c) The rate of diffusion of a gas is higher

• (d) Gaseous particles are in a state of random motion

4. A form of matter that has no fixed shape but has a fixed volume. An example of this form of matter is ———————

• a) carbon dioxide

• (b) ice

• (c) water vapor

• (d) kerosene

5. When heat is constantly supplied by a burner to boiling water, then the temperature of the water during vaporisation:

• (a) Rises very slowly

• (b) Rises rapidly until steam is produced

• (c) First rises and then becomes constant

• (d) Does not rise at all

6. The boiling point of water at sea level is ———————

• (a) 0℃

• (b) 273 K

• (c) 373 K

• (d) 273℃

7. The process in which solid is directly converted to vapours state is called —————

• (a) vapourisation

• (b) sublimation

• (c) condensation

• (d) solidification

8. The solid which undergoes sublimation is ——————

• (a) naphthalene

• (b) ice cube

• (c) sodium chloride

• (d) potassium chloride

9. Which of the following conditions is most favourable for converting gas into liquid?

• (a) High pressure, low temperature

• (b) Low pressure, low temperature

• (c) Low pressure, high temperature

• (d) High pressure, high temperature

10.During summer water kept in an earthen pot becomes cool because of the phenomenon of

• (a)diffusion

• (b)transpiration

• (c)evaporation

• (d)condensation