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JAMB UTME Physics 2021 past questions and answers

This 2021 JAMB UTME Physics set has 40 practice questions. Try these 5 free sample questions, tap a question to reveal the answer and explanation. Then practise the whole 2021 set with instant marking.

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Sample JAMB UTME Physics 2021 questions

1. How much heat is required to melt 0.20 kg of ice at 0°C? The specific latent heat of fusion of ice is 3.3 x 10^5 J/kg.
  1. 66 kJ
  2. 6.6 kJ
  3. 33 kJ
  4. 660 kJ

Answer: A. 66 kJ

The heat required is mL = 0.20 x 3.3 x 10^5 = 66,000 J, or 66 kJ.

2. A simplified wet-and-dry-bulb reading gives a wet-bulb saturation vapour pressure of 3.4 kPa and a saturation vapour pressure at the air temperature of 4.2 kPa. What is the estimated relative humidity?
  1. 69%
  2. 81%
  3. 124%
  4. 8%

Answer: B. 81%

Relative humidity is approximately (3.4/4.2) x 100%, which is about 81%.

3. A fixed mass of gas occupies a rigid container. If its pressure is 90 kPa at 27°C, what is its pressure at 127°C?
  1. 30 kPa
  2. 90 kPa
  3. 120 kPa
  4. 300 kPa

Answer: C. 120 kPa

At constant volume, pressure is proportional to kelvin temperature, so P2 = 90 x 400/300 = 120 kPa.

4. Which method of heat transfer carries energy from the Sun to the Earth through space?
  1. Conduction
  2. Convection
  3. Evaporation
  4. Radiation

Answer: D. Radiation

Radiation can transfer thermal energy through a vacuum, unlike conduction and convection.

5. A wave travels at 300 m/s and has a frequency of 50 Hz. What is its wavelength?
  1. 6 m
  2. 15 m
  3. 250 m
  4. 350 m

Answer: A. 6 m

Using v = fλ, the wavelength is λ = 300/50 = 6 m.

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