MULTIPLE CHOICE QUESTIONS:

MULTIPLE CHOICE QUESTIONS: (MCQ’s)

1. The density of water is maximum at _____

(a) 0० C
(b) 100० C
(c) 4० C
(d) 237० K

2. As the pressure of air decreases, the boiling point of the liquid _______.

(a) Decreases
(b) Increases
(c) Does not change
(d) None of these

3. Which among the following can exist in vapour state?

(a) Oxygen
(b) Hydrogen
(c) Carbon dioxide
(d) Water

4. The conversion of gas into liquid is called ________.

(a) Freezing
(b) Condensation
(c) Sublimation
(d) Fusion

5. ___________ is made up of very small tiny particles.

(a) Food
(b) Matter
(c) Organism
(d) Stone

6. The minimum temperature which a solid melts to become a liquid at the atmospheric pressure is ____.

(a) Boiling point
(b) Condensation
(c) Melting Point
(d) Evaporation

7. The temperature at which a liquid starts boiling at the atmospheric pressure is _______.

(a) Melting Point
(b) Boiling Point
(c) Condensation
(d) Evaporation

8. The amount of heat energy required to change 1 kg of a solid into liquid at its melting point is _____.

(a) Latent heat of Fusion
(b) Latent heat of Vaporisation
(c) Boiling Point
(d) Melting Point

9. A change of state directly from solid to gas without changing to liquid state.

(a) Condensation
(b) Evaporation
(c) Evaporation
(d) Decantation

10. The phenomenon of changing of a liquid into its vapour state at any temperature below its boiling point is called ______________.

(a)  Melting point
(b) Evaporation
(c) Condensation
(d) Decantation

11. The tendency of a substance to retain/maintain its shape when subjected to outside force is ____.

(a) Rigidity
(b) Flexibility
(c) Hardness
(d) Durability

12. The tendency of particular to flow is called ___________.

(a) Rigidity
(b) Fluidity
(c) Flexibility
(d) Durability

13. ___________ is defined as mass per unit volume.

(a) Acidity
(b) Velocity
(c) Density
(d) Acceleration

14. Anything that occupies space and has mass is called _____________.

(a) Volume
(b) Density
(c) Compound
(d) Matter

15. The intermingling of molecules of one substance with that of the other is called ______________.

(a) Mixing
(b) Molecular Force
(c) Diffusion
(d) Force of Attraction

16) ________ is a bulk phenomenon.
(a) Sublimation
(b) Evaporation
(c) Boiling
(d) Deposition

17) ____is a surface phenomenon.
(a) Sublimation
(b) Evaporation
(c) Boiling
(d) Deposition

18) _______ causes cooling.
(a) Sublimation
(b) Evaporation
(c) Boiling
(d) Deposition

19) 100° C will be equal to ______° K.
(a) 363°
(b) 343°
(c) 353°
(d) 373°

20) A lot of gas can be put into a cylinder due to the property of ________
(a) Compressibility
(b) Density
(c) Vapourisation
(d) None of the above

21) Change of gaseous state directly to solid state without going through the liquid state is called ________
(a) Sublimation
(b) Evaporation
(c) Boiling
(d) Deposition
22. The property of flow is unique to fluids. Which one of the following statements is correct?

(a) Only gases behave like fluids
(b) Gases and solids behave like fluids
(c) Gases and liquids behave like fluids
(d) Only liquids are fluids

23. During summer, water kept in an earthen pot becomes cool because of the phenomenon of __
(a) Diffusion
(b) Transpiration
(c) Osmosis
(d) Evaporation

24. Dry ice is _____
(a) Water in solid state
(b) Water in gaseous state
(c) CO2 in liquid state
(d) CO2 in solid state

25. Choose the correct statement from the following:
(a) Conversion of solid into vapour without passing through the liquid state is called vapourisation.
(b) Conversion of vapour into solid without passing through the liquid state is called sublimation.
(c) Conversion of vapour into solid without passing through the liquid state is called freezing.
(d) Conversion of solid into liquid is called sublimation

26. Which condition out of the following will increase the evaporation of water?
(a) Increase in temperature of water
(b) Decrease in temperature of water
(c) Less exposed surface area of water
(d) Adding common salt to water

27. 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
(a) (i) and (iii)
(b) (i) and (iv)
(c) (ii) and (iii)
(d) (ii) and (iv)

28. The boiling point of water at sea level is ___
(a) 0°C
(b) 273 K
(c) 373 K
(d) 273°C

29. Which of the following has the strongest interparticle forces at room temperature?
(a) Oxygen
(b) Water
(c) Bromine
(d) Iron

30. Which of the following conditions is most favourable for converting a gas into a liquid?
(a) High pressure, low temperature
(b) Low pressure, low temperature
(c) Low pressure, high temperature
(d) High pressure, high temperature

Answers:
1. (c) 4०c
2. (a)Decreases
3. (d) Water
4. (b) Condensation
5. (b) Matter
6. (c) Melting Point
7. (b) Boiling Point
8. (a) Latent heat of fusion
9. (c) Evaporation
10. (b) Evaporation
11. (a) Rigidity
12. (b) Fluidity
13. (c) Density
14. (d) Matter
15. (c) Diffusion
16. (c) Boiling
17. (b) Evaporation
18. (b) Evaporation
19.(d) 373°
20. (a) Compressibility
21. (d) Deposition
22.(c) Gases and liquids behave like fluids
23.(d) Evaporation
24.(d) CO2 in solid state
25.(b) Conversion of vapour into solid without passing through the liquid state is called sublimation.
26.(a) Increase in temperature of water
27.(c) (ii) and (iii)
28.(c) 373 K
29. (d) Iron
30. (a) High pressure, low temperature