9th Chemistry Chapter 5 solved exercise MCQs

Physical States of Matter

1. How many times are the liquids denser than gases ?

(a) 100 times

(b) 1000 times ✔

(c) 10,000 times

(d) 100,000 times

2. Gases are the lightest form of matter and their densities are expressed in terms of :

(a) mg/cm3

(b) g/cm3

(c) g/dm3 ✔

(d) kg/dm3

3. Which one of the following coexists in dynamic equilibrium at freezing point ?

(a) gas and solid

(b) liquid and gases

(c) liquid and solid ✔

(d) all of these

4. Which one of the following motions are possessed by solid particles ?

(a) rotational motion

(b) vibrational motion ✔

(c) translational motion

(d) both translational and vibrational motions

5. Which one of the following is not amorphous ?

(a) rubber

(b) plastic

(c) glass

(d) glucose ✔

6. One atmospheric pressure is equal to how many Pascals :

(a) 101325 ✔

(b) 10325

(c) 106075

(d) 10523

7. In the evaporation process , liquid molecules which leave the surface of the liquid have :

(a) very low energy

(b) moderate energy

(c) very high energy ✔

(d) none of these

8. Which one of the following gas diffuses fastest ?

(a) hydrogen ✔

(b) helium

(c) flurine

(d) chlorine

9. Which one of the following does not affect the boiling point ?

(a) intermolecular forces

(b) external pressure

(c) nature of liquid

(d) initial temperature of liquid ✔

10. Density of a gas increases, when its :

(a) temperature is increased

(b) pressure is increased ✔

(c) volume is kept constant

(d) none of these

11. The vapour pressure of a liquid increases with the :

(a) increase of pressure

(b) increase of temperature ✔

(c) increase of intermolecular forces

(d) increase of polarity of molecules

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