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JAMB UTME Physics 2015 past questions and answers

This 2015 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 2015 set with instant marking.

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Sample JAMB UTME Physics 2015 questions

1. A p-n junction diode is forward biased when
  1. the p-side is connected to the negative terminal and the n-side to the positive terminal
  2. both sides are connected to the positive terminal
  3. the p-side is connected to the positive terminal and the n-side to the negative terminal
  4. both sides are connected to the negative terminal

Answer: C. the p-side is connected to the positive terminal and the n-side to the negative terminal

Forward bias connects the p-side to the positive terminal and the n-side to the negative terminal, reducing the junction barrier.

2. Light of a frequency above the threshold frequency shines on a metal surface; if its intensity is increased while its frequency is kept constant, what happens?
  1. The photoelectric current increases, while the maximum kinetic energy of the electrons remains unchanged.
  2. The photoelectric current remains unchanged, while the maximum kinetic energy increases.
  3. Both the photoelectric current and maximum kinetic energy decrease.
  4. No electrons are emitted because the frequency is unchanged.

Answer: A. The photoelectric current increases, while the maximum kinetic energy of the electrons remains unchanged.

Greater intensity supplies more photons per second and raises the current, but maximum kinetic energy depends on frequency.

3. A radioactive source has a half-life of 6 hours and an initial count rate of 160 counts per minute; what is its count rate after 18 hours?
  1. 80 counts per minute
  2. 40 counts per minute
  3. 10 counts per minute
  4. 20 counts per minute

Answer: D. 20 counts per minute

Eighteen hours is three half-lives, so the count rate is 160/(2^3) = 20 counts per minute.

4. In the reaction 235U + 1n -> 141Ba + 92Kr + 3 neutrons, which conservation statement is correct?
  1. The total nucleon number falls from 236 to 233.
  2. The total nucleon number is 236 on both sides and the total proton number is 92 on both sides.
  3. The total proton number rises from 92 to 95.
  4. The total nucleon number is 235 on both sides.

Answer: B. The total nucleon number is 236 on both sides and the total proton number is 92 on both sides.

The left side has 236 nucleons and 92 protons, while the right side has 141 + 92 + 3 = 236 nucleons and 56 + 36 = 92 protons.

5. A vernier caliper has 10 vernier divisions equal to 9 mm on its main scale; if the main-scale reading is 2.30 cm and the sixth vernier division coincides, what is the measured length?
  1. 2.24 cm
  2. 2.90 cm
  3. 2.36 cm
  4. 2.36 mm

Answer: C. 2.36 cm

The least count is 1 mm - 0.9 mm = 0.1 mm, so the reading is 23.0 mm + 0.6 mm = 23.6 mm = 2.36 cm.

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