11. The intermolecular forces in liquids are generally:

a) Weaker than in gases
b) Stronger than in gases
c) Equal to those in gases
d) Non-existent in liquids
Answer: b) Stronger than in gases

12. Which of the following properties is characteristic of liquids?

a) Definite shape and indefinite volume
b) Indefinite shape and definite volume
c) Indefinite shape and indefinite volume
d) Definite shape and definite volume
Answer: b) Indefinite shape and definite volume

13. In which state of matter do particles have fixed positions but vibrate around their equilibrium positions?

a) Gas
b) Liquid
c) Solid
d) Plasma
Answer: c) Solid

14. The process by which a liquid turns into a gas is called:

a) Condensation
b) Evaporation
c) Freezing
d) Melting
Answer: b) Evaporation

15. Which type of solid is characterized by a repeating three-dimensional pattern?

a) Amorphous solid
b) Molecular solid
c) Crystalline solid
d) Polymeric solid
Answer: c) Crystalline solid

16. The temperature at which a liquid turns into a solid is called:

a) Melting point
b) Boiling point
c) Freezing point
d) Sublimation point
Answer: c) Freezing point

17. The heat required to convert a liquid into a gas at its boiling point is known as:

a) Heat of fusion
b) Heat of vaporization
c) Heat of sublimation
d) Heat of condensation
Answer: b) Heat of vaporization

18. The heat required to change a solid into a liquid at its melting point is known as:

a) Heat of vaporization
b) Heat of fusion
c) Heat of sublimation
d) Heat of condensation
Answer: b) Heat of fusion

19. Which of the following describes a substance that can exhibit both liquid and solid properties depending on temperature?

a) Crystalline solid
b) Amorphous solid
c) Glass
d) Metal
Answer: c) Glass

20. Which property is used to describe the tendency of a liquid to rise in a narrow tube against gravity?

a) Viscosity
b) Surface tension
c) Capillarity
d) Density
Answer: c) Capillarity