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Physics 2021 JAMB Past Questions

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21

A lead bullet of mass 0.05kg is fired with a velocity of 200ms\(^{-1}\) into a block of mass 0.95kg. Given that the lead block can move freely, the final kinetic energy after impact is?

  • A. 50J
  • B. 100J
  • C. 150J
  • D. 200J
View Answer & Discuss (8) JAMB 2021
22

A ball of mass 0.1kg is thrown vertically upwards with a speed of 10ms\(^{-1}\) from the top of a tower 10m high. Neglecting air resistance, its total energy just before hitting the ground is? (Take g = 10ms\(^{-2}\))

  • A. 5J
  • B. 10J
  • C. 15J
  • D. 20J
View Answer & Discuss (7) JAMB 2021
23

A car of mass 800kg attains a speed of 25m/s in 20secs. The power developed in the engine is?

  • A. 1.25 x 10\(^{4}\)W
  • B. 2.50x 10\(^{4}\)W
  • C. 1.25 x 10\(^{6}\)W
  • D. 2.50 x 10\(^{6}\)W
View Answer & Discuss (14) JAMB 2021
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24

When the breaks in a car are applied, the frictional force on the tyres is?

  • A. a disadvantage because it is in the direction of the motion of the car
  • B. a disadvantage because it is in the opposite direction of the motion of the car
  • C. an advantage because it is in the direction of the motion of the car
  • D. an advantage because it is in the opposite direction of the motion of the car
View Answer & Discuss (1) JAMB 2021
25

If the stress on a wire is 10\(^{7}\)NM\(^{-2}\) and the wire is stretched from its original length of 10.00m to 10.05m. The young's modulus of the wire is?

  • A. 5.0 x 10\(^{-4}\)Nm\(^{-2}\)
  • B. 5.0 x 10\(^{-5}\)Nm\(^{-2}\)
  • C. 2.0 x 10\(^{-8}\)Nm\(^{-2}\)
  • D. 2.0 x 10\(^{9}\)Nm\(^{-2}\)
View Answer & Discuss (5) JAMB 2021
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