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Quiz Chapter 4: Heat

10 questions · Form 4 Physics Bab 4: Heat

10 questions · plays in fullscreen

Full Question List & Answer Key

Prefer reading to quizzing? All 10 questions are listed below with the answer and explanation under each one.

1. According to Charles's Law, what happens to the volume of a fixed mass of gas when its temperature in Kelvin is doubled at constant pressure?

  1. Volume is halved
  2. Volume doubles
  3. Volume quadruples
  4. Volume remains unchanged
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Answer: B

Charles's Law states V ∝ T. Doubling the absolute temperature T directly doubles the volume V.

2. A uncalibrated liquid-in-glass thermometer has a mercury column length of 4 cm at 0°C and 24 cm at 100°C. What temperature is recorded when the column length is 14 cm?

  1. 40°C
  2. 70°C
  3. 50°C
  4. 60°C
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Answer: C

θ = [L_θ - L_0L_100 - L_0] × 100 = [14 - 424 - 4] × 100 = (1020) × 100 = 50°C.

3. Why does the temperature of ice remain constant at 0°C while it is melting?

  1. No heat is being absorbed by the ice
  2. Heat absorbed is used to break intermolecular bonds rather than increase kinetic energy
  3. The ice releases heat into the environment at the same rate
  4. Latent heat reduces the kinetic energy of water molecules
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Answer: B

During a phase change, heat absorbed (latent heat) is used to overcome intermolecular forces of attraction. Average kinetic energy does not increase, keeping temperature constant.

4. Which law states that for a fixed mass of gas at constant temperature, pressure is inversely proportional to volume?

  1. Gay-Lussac's Law
  2. Charles's Law
  3. Boyle's Law
  4. Newton's Law
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Answer: C

Boyle's Law describes the pressure-volume relationship at constant temperature: P ∝ 1V (P1 V1 = P2 V2).

5. Which material feature is best suited for the base of a frying pan?

  1. High specific heat capacity so it heats up slowly
  2. Low specific heat capacity so it heats up rapidly
  3. High specific latent heat of fusion
  4. Low thermal conductivity
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Answer: B

A base with a low specific heat capacity requires less heat to raise its temperature quickly, allowing fast cooking.

6. Why is water used as a coolant agent in car engine radiators?

  1. Water has a low specific latent heat of fusion
  2. Water expands rapidly when heated
  3. Water has a very high specific heat capacity
  4. Water boils at low temperatures
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Answer: C

Water's high specific heat capacity (4200 J kg-1 °C-1 allows it to absorb a large amount of heat energy from the engine with only a small rise in temperature.

7. Which graph correctly represents Boyle's Law for an ideal gas at constant temperature?

  1. A straight line with positive slope when plotting P against V
  2. A straight line passing through origin when plotting P against 1V
  3. A horizontal straight line when plotting P against T
  4. A curved line with increasing slope when plotting P against 1V
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Answer: B

Since P ∝ 1V, a graph of P versus 1V yields a straight line passing through the origin.

8. Which process involves absorbing latent heat without changing temperature?

  1. Cooling water from 80°C to 30°C
  2. Boiling water at 100°C into steam
  3. Freezing molten iron into solid
  4. Condensing steam to water
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Answer: B

Boiling absorbs specific latent heat of vaporisation to transition water from liquid to gas at a constant temperature of 100°C.

9. What is absolute zero temperature on the Celsius scale?

  1. 0°C
  2. -273°C
  3. -100°C
  4. 273°C
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Answer: B

Absolute zero is 0 K, which corresponds to -273°C (-273.15°C).

10. Calculate the quantity of heat required to raise the temperature of 2 kg of aluminum from 30°C to 80°C. (Specific heat capacity of aluminum = 900 J kg-1 °C-1

  1. 90 000 J
  2. 144 000 J
  3. 45 000 J
  4. 900 000 J
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Answer: A

Q = m c Δθ = 2 × 900 × (80 - 30) = 2 × 900 × 50 = 90 000 J.

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