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Sunday, 21 June 2026
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Physics Past Questions and Answers

Topic: Conservation of energy

Jamb Physics Questions - Conservation of energy

Question 6:
A bead traveling on a straight wire is brought to rest at 0.2m by friction. If the mass of the bead is 0.01kg and the coefficient of friction between the bead and the wire is 0.1 determine the work done by the friction
  • A \( 2 \times 10^{-4}J \)
  • B \( 2 \times 10^{-3}J \)
  • C \( 2 \times 10^{1}J \)
  • D \( 2 \times 10^{2}J \)
View Answer & Explanation
Question 7:
The efficiency of a machine is always less than 100% because the
  • A Work output is always greater than the work input
  • B Load lifted is always greater than the effort applied
  • C Effort applied is always greater than the load lifted
  • D Velocity ratio is always greater than the mechanical advantage
View Answer & Explanation
Question 8:
An object of mass 20kg is released from a height of 10m above the ground level. The kinetic energy of the object just before it hits the ground is
  • A 200J
  • B 4000J
  • C 2000J
  • D 500J
View Answer & Explanation
Question 9:
Which of the following option is right if an object fall freely to the ground?
1. The total energy is Kinetic
2. The ratio of potential energy to kinetic energy is constant
3. The sum of potential and kinetic is constant
  • A 1 only
  • B 2 only
  • C 3 only
  • D 1 and 2 only
View Answer & Explanation
Question 10:
Which of the following statements is/are correct for a freely falling body?
I. the total is entirely kinetic
II. the ratio of potential energy to kinetic energy is constant
III. the sum of potential and kinetic energy is constant
  • A I only
  • B II only
  • C III only
  • D I & III only
View Answer & Explanation