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JAMB UTME Physics 2023 past questions and answers

This 2023 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 2023 set with instant marking.

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Sample JAMB UTME Physics 2023 questions

1. A compound microscope has an objective magnification of 5 and an eyepiece magnification of 10. What is its total magnifying power?
  1. 50
  2. 15
  3. 2
  4. 5

Answer: A. 50

The total magnifying power is the product of the objective and eyepiece magnifications, 5 x 10 = 50.

2. When white light passes through a glass prism, which colour is deviated the most?
  1. Red
  2. Violet
  3. Yellow
  4. Green

Answer: B. Violet

Violet light has the greatest refractive index in glass among visible colours and is therefore deviated most.

3. Two point charges of 2 microcoulombs and 3 microcoulombs are 0.30 m apart in air. What is the magnitude of the force between them? Take k = 9.0 x 10^9 N m^2 C^-2.
  1. 0.06 N
  2. 6.0 N
  3. 0.60 N
  4. 1.8 N

Answer: C. 0.60 N

Coulomb's law gives F = kq1q2/r^2 = (9.0 x 10^9)(6.0 x 10^-12)/(0.30)^2 = 0.60 N.

4. What is the electric potential 0.20 m from an isolated charge of 4.0 microcoulombs in air? Take k = 9.0 x 10^9 N m^2 C^-2.
  1. 18 kV
  2. 45 kV
  3. 90 kV
  4. 180 kV

Answer: D. 180 kV

The potential is V = kq/r = (9.0 x 10^9)(4.0 x 10^-6)/0.20 = 1.8 x 10^5 V, or 180 kV.

5. Two capacitors of capacitances 3 microfarads and 6 microfarads are connected in series. What is their equivalent capacitance?
  1. 2 microfarads
  2. 9 microfarads
  3. 4.5 microfarads
  4. 18 microfarads

Answer: A. 2 microfarads

For series capacitors, 1/C = 1/3 + 1/6, so the equivalent capacitance is 2 microfarads.

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