CBSE Class 9 OTBA Chemistry Sample Question Paper

1. MATTER IN OUR SURROUNDINGS

1. As solid melts to form liquid:

a. Inter particle distance increases

b. Inter molecular forces of attraction decreases

c. Compressibility increases

d. All of the above

2. Which of the following is not characteristic of solid:

a. High Rigidity

b. Regular Shape

c. High density

d. High compressibility

3. The boiling point of water is:

a. 101^oC at atmospheric pressure

b. 273K at atmospheric pressure

c. 0^oC at atmospheric pressure

d. 0K at atmospheric pressure

4. Which of the following has highest intermolecular forces of attraction?

a. Water at room temperature

b. CO₂ gas

c. Ethyl alcohol

d. Iron metal

5. Which of the following substances will undergo sublimation?

a. Common salt

b. Odonil

c. Sugar

d. Sand

6. The process of evaporation causes:

a. Cooling

b. Heating

c. Dryness

d. None of the above

7. The conversion of solid to gas directly is called:

 a. Evaporation

b. Sublimation

c. Distillation

d. condensation

8. Evaporation of a liquid can take place:

a. At its boiling point

b. At all temperatures

c. At its freezing point

d. At a fixed temperature

9. Which of the following describes a liquid state:

a. Definite volume and definite shape

b. Definite volume and no specific shape

c. definite shape but no definite volume

d. neither definite shape nor definite volume

10. Wet clothes are kept for drying. Which of the following does not help them in drying:

a. Spreading it out

b. Blowing wind over it

c. Making the room a little warmer

d. Cooling the room

11. At higher altitudes the boiling points of liquids

a. Increases b. Decreases

c. Remains the same d. Increases then decreases

12. During evaporation particles of a liquid change into vapours :

a. From the surface

b. From the bulk

c. From the bottom

d. From all over the liquid

13. In which phenomenon does water change into water vapour below its boiling point:

a. Boiling

b. Evaporation

c. Freezing

d. Sublimation

14. We get the smell of hot food in the kitchen outside the house because of:

a. Boiling

b. Evaporation

c. Sublimation

d. Diffusion

15. which are the favourable conditions for liquefaction of petroleum gas:

a. High pressure, high temperature

b. Low pressure, low temperature

c. High pressure, low temperature

d. Low pressure, high temperature

16. latent heat of vapourisation is used to:

a. Overcome forces of attraction between the liquid particles at the boiling point

b. Overcome forces of attraction between solid particles at the freezing point

c. Increase the kinetic energy of particles in the liquid state

d. Increase the kinetic energy of the particles in the vapour phase

17. Which of the following has highest density?

a. Kerosene

b. Water

c. Iron

d. Wood

18. Dry ice on heating produces:

a. Liquid CO₂

b. Gas CO₂

c. Liquid water

d. Water vapour

19. Particles move randomly in:

a. Water

b. Sugar

c. Nitrogen

d. Dry ice

20. When we blow air into the balloon it inflates because:

a. Air particles diffuse into the balloon

b. Air particles collide with the walls of the balloon and exert pressure on them

c. Rubber is elastic in nature

d. The temperature of air in the balloon increases

Please refer to attached file for CBSE Class 9 OTBA Chemistry Sample Question Paper