Exercise - Matter
1. Multiple Choice Questions (MCQs)
i. What happens to the internal energy of a substance during melting?
- a) It decreases
- b) It stays the same
- c) It increases
- d) It fluctuates
ii. Which process involves a solid turning directly into a gas?
- a) Melting
- b) Freezing
- c) Sublimation
- d) Condensation
iii. Boiling occurs at:
- a) Any temperature
- b) A fixed temperature
- c) Only at room temperature
- d) Any pressure
iv. During condensation, the particles in a gas:
- a) Gain energy and move faster
- b) Lose energy and move slower
- c) Gain energy and move slower
- d) Lose energy and move faster
v. Which law states that the volume of a gas is directly proportional to its temperature at constant pressure?
- a) Boyle's Law
- b) Charles's Law
- c) Avogadro's Law
- d) Dalton's Law
vi. Evaporation differs from boiling because:
- a) Evaporation occurs at the surface of a liquid at any temperature
- b) Boiling occurs only at the surface
- c) Evaporation requires a fixed temperature
- d) Boiling occurs at any temperature
vii. According to kinetic particle theory, the pressure of a gas increases when:
- a) The volume increases
- b) The temperature decreases
- c) The number of particles decreases
- d) The temperature increases