arrow_backBack to Study Resources

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. An electric heater rated at 500 W takes 4 minutes to melt 0.5 kg of ice at 0°C. Calculate the specific latent heat of fusion of ice.

  1. 2.4 × 105 J kg-1
  2. 1.2 × 105 J kg-1
  3. 4.8 × 105 J kg-1
  4. 6.0 × 104 J kg-1
Show answer

Answer: A

Q = P t = 500 × (4 × 60) = 120 000 J. Q = m l_f => l_f = 120 0000.5 = 240 000 J kg-1 = 2.4 × 105 J kg-1.

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

  1. 0°C
  2. -273°C
  3. -100°C
  4. 273°C
Show answer

Answer: B

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

3. A balloon contains 2.0 L of air at 300 K. If heated to 450 K at constant atmospheric pressure, what is the new volume of the balloon?

  1. 1.33 L
  2. 3.0 L
  3. 4.5 L
  4. 2.5 L
Show answer

Answer: B

V1 / T1 = V2 / T2 => 2.0300 = V2 / 450 => V2 = 2.0 × 450300 = 3.0 L.

4. 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
Show answer

Answer: C

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

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
Show answer

Answer: B

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

6. According to the kinetic theory of gases, what happens to gas molecules when the temperature of the gas increases?

  1. Their average kinetic energy and average velocity increase
  2. The size of individual molecules expands
  3. The mass of gas molecules increases
  4. The frequency of molecular collisions with container walls decreases
Show answer

Answer: A

Temperature is a measure of the average kinetic energy of molecules. Increasing temperature speeds up molecular motion.

7. An immersion heater supplies 2000 J of energy to 0.1 kg of a liquid, increasing its temperature from 25°C to 45°C. What is the specific heat capacity of the liquid?

  1. 1000 J kg-1 °C-1
  2. 800 J kg-1 °C-1
  3. 400 J kg-1 °C-1
  4. 2000 J kg-1 °C-1
Show answer

Answer: A

Q = m c Δθ => 2000 = 0.1 × c × (45 - 25) => 2000 = 2 c => c = 1000 J kg-1 °C-1.

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
Show answer

Answer: B

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

9. 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
Show answer

Answer: A

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

10. A trapped gas in a cylinder has a volume of 0.04 m³ at a pressure of 100 kPa. If the gas is compressed at constant temperature to a volume of 0.01 m³, what is the new pressure?

  1. 25 kPa
  2. 200 kPa
  3. 400 kPa
  4. 500 kPa
Show answer

Answer: C

P1 V1 = P2 V2 => 100 × 0.04 = P2 × 0.01 => P2 = 40.01 = 400 kPa.

Sponsored