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Quiz Chapter 4: Heat

10 questions · Form 4 Physics Bab 4: Heat

Question 1 of 10Score: 0

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?

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 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
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Answer: A

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

2. 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
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Answer: B

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

3. 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.

4. How much heat is released when 0.2 kg of steam at 100°C condenses into water at 100°C? (Specific latent heat of vaporisation of water = 2.26 × 106 J kg-1

  1. 4.52 × 105 J
  2. 1.13 × 106 J
  3. 2.26 × 105 J
  4. 4.52 × 106 J
Show answer

Answer: A

Q = m l_v = 0.2 × (2.26 × 106 = 4.52 × 105 J.

5. 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.

6. 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.

7. 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
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Answer: C

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

8. A fixed mass of gas in a rigid container has a pressure of 1.2 × 105 Pa at 27°C. What will its pressure be at 127°C?

  1. 1.6 × 105 Pa
  2. 5.64 × 105 Pa
  3. 1.2 × 105 Pa
  4. 2.4 × 105 Pa
Show answer

Answer: A

Convert temperatures to Kelvin: T1 = 27 + 273 = 300 K; T2 = 127 + 273 = 400 K. P1 / T1 = P2 / T2 => 1.2 × 105300 = P2 / 400 => P2 = 1.6 × 105 Pa.

9. What variable is kept constant in Gay-Lussac's Law?

  1. Pressure
  2. Temperature
  3. Volume
  4. Mass and Volume
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Answer: D

Gay-Lussac's Law investigates the relationship between pressure and temperature for a fixed mass of gas at constant volume.

10. 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).

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