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JAMB UTME 2021

JAMB Physics 2021 past questions

6 objective questions from the 2021 JAMB Physics paper. Answer each one, then reveal the answer and explanation.

All JAMB Physics past questions

  1. Question 1

    Heat

    Which of these is the SI unit of heat?

    1. Option A: Kelvin
    2. Option B: Degree Celsius
    3. Option C: Joule
    4. Option D: Watt
    Show the answer to question 1

    Answer: C, Joule

    Heat is a form of energy, measured in joules.

  2. Question 2

    Waves

    A wave of frequency 100 Hz has a wavelength of 2 m. Find its speed.

    1. Option A: 50 m/s
    2. Option B: 0.02 m/s
    3. Option C: 400 m/s
    4. Option D: 200 m/s
    Show the answer to question 2

    Answer: D, 200 m/s

    v = fλ = 100 × 2 = 200 m/s.

  3. Question 3

    Heat

    How much heat is needed to raise the temperature of 1.5 kg of water by 30 °C? (Specific heat capacity of water = 4200 J/kg K.)

    1. Option A: 94,500 J
    2. Option B: 6,300 J
    3. Option C: 126,000 J
    4. Option D: 189,000 J
    Show the answer to question 3

    Answer: D, 189,000 J

    Q = mcΔθ = 1.5 × 4200 × 30 = 189,000 J.

  4. Question 4

    Work and energy

    Calculate the kinetic energy of a 7 kg body moving at 6 m/s.

    1. Option A: 252 J
    2. Option B: 21 J
    3. Option C: 42 J
    4. Option D: 126 J
    Show the answer to question 4

    Answer: D, 126 J

    KE = ½mv² = ½ × 7 × 6² = 126 J.

  5. Question 5

    Motion

    A car moving at 8 m/s accelerates uniformly at 2 m/s² for 4 s. Find its final velocity.

    1. Option A: 16 m/s
    2. Option B: 10 m/s
    3. Option C: 32 m/s
    4. Option D: 40 m/s
    Show the answer to question 5

    Answer: A, 16 m/s

    Use v = u + at = 8 + 2 × 4 = 16 m/s.

  6. Question 6

    Density

    A sample of mass 20 g occupies a volume of 20 cm³. Calculate its density.

    1. Option A: 10 g/cm³
    2. Option B: 0.5 g/cm³
    3. Option C: 1 g/cm³
    4. Option D: 2 g/cm³
    Show the answer to question 6

    Answer: C, 1 g/cm³

    Density = mass ÷ volume = 20 ÷ 20 = 1 g/cm³.

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