NCERT Class 9 MCQ Quiz Hub

1. Which of the following phenomena would increase on raising the temperature?
Diffusion, evaporation, compression of gases
Evaporation, compression of gases, solubility
Evaporation, diffusion, expansion of gases
Evaporation, solubility, diffusion, compression of gases

2. Seema visited a Natural Gas Compressing unit and found that the gas can be liquefied under specific conditions of temperature and pressure. While sharing her experience with friends she got confused. Help her to identify the correct set of conditions.
Low temperature, low pressure
High temperature, low pressure
Low temperature, high pressure
High temperature, high pressure

3. The property of flow is unique to fluids. Which one of the following statements is correct?
Only gases behave like fluids
Gases and solids behave like fluids
Gases and liquids behave like fluids
Only liquids are fluids

4. During summer, water kept in an earthen pot becomes cool because of the phenomenon of
diffusion
transpiration
osmosis
evaporation

5. A few substances are arranged in the increasing order of ‘forces of attraction’ between their particles. Which one of the following represents a correct arrangement?
Water, air, wind
Air, sugar, oil
Oxygen, water, sugar
Salt, juice, air

6. On converting 25°C, 38°C and 66°C to Kevlin scale, the correct sequence of temperature will be
298 K, 311 K and 339 K
298 K, 300 K and 338 K
273 K, 278 K and 543 K
298 K, 310 K and 338 K

7. Choose the correct statement from the following:
Conversion of solid into vapour without passing through the liquid state is called vapourisation.
Conversion of vapour into solid without passing through the liquid state is called sublimation.
Conversion of vapour into solid without passing through the liquid state is called freezing.
Conversion of solid into liquid is called sublimation.

8. The boiling points of diethyl ether, acetone and n-butyl alcohol are 35°C, 56°C and 118°C respectively. Which one of the following correctly represents their boiling points in Kelvin scale?
306 K, 329 K and 391 K
308 K, 329 K and 392 K
308 K, 329 K and 391 K
329 K, 392 K and 308 K

9. Which condition out of the following will increase the evaporation of water?
Increase in temperature of water
Decrease in temperature of water
Less exposed surface area of water
Adding common salt to water

10. In which of the following conditions, the distance between the molecules of hydrogen gas would increase? (i) Increasing pressure on hydrogen contained in a closed container (ii) Some hydrogen gas leaking out of the container (iii) Increasing the volume of the container of hydrogen gas (iv) Adding more hydrogen gas to the container without increasing the volume of the container
(i) and (iii)
(i) and (iv)
(ii) and (iii)
(ii) and (iv)

11. The boiling point of water at sea level is
0°C
273 K
373 K
273°C

12. Which of the following has the strongest interparticle forces at room temperature?
Oxygen
Water
Bromine
Iron

13. Which of the following conditions is most favourable for converting a gas into a liquid?
High pressure, low temperature
Low pressure, low temperature
Low pressure, high temperature
High pressure, high temperature

14. Dry ice is
water in solid state
water in gaseous state
CO2 in liquid state
CO2 in solid state