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JAMB UTME Physics 2026 past questions and answers

This 2026 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 2026 set with instant marking.

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Sample JAMB UTME Physics 2026 questions

1. In an n-type semiconductor, which charge carriers are present in the greatest concentration?
  1. Free electrons
  2. Holes
  3. Positive ions
  4. Neutrons

Answer: A. Free electrons

Donor impurities contribute extra mobile electrons, making electrons the majority carriers in an n-type semiconductor.

2. A p-n junction diode is connected in series with a lamp and a cell. Which property explains why the diode can protect the lamp from current in one direction of connection?
  1. It stores charge indefinitely
  2. It conducts readily in forward bias but opposes current in reverse bias
  3. Its resistance is always zero
  4. It converts direct current to alternating current

Answer: B. It conducts readily in forward bias but opposes current in reverse bias

A diode conducts in forward bias and greatly restricts current in reverse bias.

3. Light of frequency below the threshold frequency shines on a clean metal surface. What happens as the light intensity is increased?
  1. Electrons are emitted with greater kinetic energy
  2. The threshold frequency decreases
  3. No photoelectrons are emitted
  4. The metal emits more electrons

Answer: C. No photoelectrons are emitted

Below the threshold frequency, individual photons lack the minimum energy needed to eject electrons, regardless of intensity.

4. A radioactive sample has a half-life of 6 hours. What fraction of its original undecayed nuclei remains after 18 hours?
  1. 1/2
  2. 1/4
  3. 1/6
  4. 1/8

Answer: D. 1/8

Eighteen hours is three half-lives, so the remaining fraction is (1/2)^3 = 1/8.

5. Energy is released in nuclear fission mainly because the products have
  1. greater total binding energy than the original heavy nucleus
  2. more electrons than the original nucleus
  3. a greater total mass than the original nucleus
  4. no neutrons

Answer: A. greater total binding energy than the original heavy nucleus

Fission products are more tightly bound overall, and the corresponding mass defect is released as energy.

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