MULTIPLE CHOICE QUESTIONS: (MCQ’s)
1. The density of water is maximum at _____
2. As the pressure of air decreases, the boiling point of the liquid _______.
3. Which among the following can exist in vapour state?
4. The conversion of gas into liquid is called ________.
5. ___________ is made up of very small tiny particles.
6. The minimum temperature which a solid melts to become a liquid at the atmospheric pressure is ____.
7. The temperature at which a liquid starts boiling at the atmospheric pressure is _______.
8. The amount of heat energy required to change 1 kg of a solid into liquid at its melting point is _____.
9. A change of state directly from solid to gas without changing to liquid state.
10. The phenomenon of changing of a liquid into its vapour state at any temperature below its boiling point is called ______________.
(c) Condensation
11. The tendency of a substance to retain/maintain its shape when subjected to outside force is ____.
12. The tendency of particular to flow is called ___________.
13. ___________ is defined as mass per unit volume.
14. Anything that occupies space and has mass is called _____________.
15. The intermingling of molecules of one substance with that of the other is called ______________.
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