9th Chemistry Chapter 5 solved exercise MCQs
Physical States of Matter
- 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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