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JAMB UTME Physics 2016 past questions and answers

This 2016 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 2016 set with instant marking.

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Sample JAMB UTME Physics 2016 questions

1. A p-n junction diode is connected in forward bias; what is the main effect?
  1. A large current can flow through the junction
  2. The depletion layer becomes wider
  3. The junction blocks all current
  4. The diode changes alternating current into direct current without a circuit

Answer: A. A large current can flow through the junction

Forward bias reduces the depletion barrier and permits substantial current through the diode.

2. In a common-emitter transistor circuit, which current is controlled by a small change in base current?
  1. Emitter current only
  2. Collector current
  3. Leakage current in the power supply
  4. Current through the insulating case

Answer: B. Collector current

A small base-current change produces a larger corresponding change in collector current.

3. Light of a fixed frequency below a metal's threshold frequency is made more intense; what happens to photoelectric emission?
  1. The emitted electrons acquire greater maximum kinetic energy
  2. The threshold frequency decreases
  3. No photoelectrons are emitted
  4. The work function becomes zero

Answer: C. No photoelectrons are emitted

Below threshold frequency, each photon lacks the energy needed to eject an electron, regardless of intensity.

4. A photon has frequency 5.0 x 10^14 Hz; using h = 6.6 x 10^-34 J s, its energy is approximately
  1. 1.3 x 10^-48 J
  2. 3.0 x 10^-19 J
  3. 7.6 x 10^-20 J
  4. 3.3 x 10^-19 J

Answer: D. 3.3 x 10^-19 J

The photon energy is E = hf = 6.6 x 10^-34 x 5.0 x 10^14 = 3.3 x 10^-19 J.

5. A radioactive sample has a half-life of 12 days; what fraction of its original undecayed nuclei remains after 36 days?
  1. 1/8
  2. 1/3
  3. 1/4
  4. 1/16

Answer: A. 1/8

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

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