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JAMB UTME Physics 2018 past questions and answers

This 2018 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 2018 set with instant marking.

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Sample JAMB UTME Physics 2018 questions

1. A uniform horizontal beam 4.0 m long is pivoted at its centre. A 30 N load is placed 1.0 m to the left of the pivot. What downward force applied 1.5 m to the right will keep the beam in equilibrium?
  1. 20 N
  2. 15 N
  3. 30 N
  4. 45 N

Answer: A. 20 N

Taking moments about the pivot gives 30 x 1.0 = F x 1.5, hence F = 20 N.

2. A machine raises a 600 N load through 2.0 m when an effort of 250 N moves through 6.0 m. What is its efficiency?
  1. 60%
  2. 70%
  3. 80%
  4. 75%

Answer: C. 80%

Efficiency = useful work output/work input = (600 x 2)/(250 x 6) = 0.80, or 80%.

3. A 10 kg block is pulled along a horizontal floor at constant speed by a horizontal force of 25 N. What is the coefficient of friction? (g = 10 m s^-2)
  1. 0.20
  2. 0.40
  3. 0.25
  4. 2.50

Answer: C. 0.25

At constant speed the friction is 25 N; the normal reaction is 100 N, so mu = 25/100 = 0.25.

4. A stone moves in a horizontal circle of radius 0.50 m at a speed of 4.0 m s^-1. Its centripetal acceleration is
  1. 32 m s^-2
  2. 8 m s^-2
  3. 16 m s^-2
  4. 64 m s^-2

Answer: A. 32 m s^-2

Centripetal acceleration a = v^2/r = 16/0.50 = 32 m s^-2.

5. A particle executes simple harmonic motion with amplitude 0.10 m and frequency 2.0 Hz. What is its maximum speed?
  1. 0.40 pi m s^-1
  2. 0.20 pi m s^-1
  3. 2.0 pi m s^-1
  4. 4.0 pi m s^-1

Answer: A. 0.40 pi m s^-1

Maximum speed is omega A = 2 pi f A = 2 pi x 2 x 0.10 = 0.40 pi m s^-1.

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