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Tuesday, 03 November 2026
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Physics Past Questions and Answers

Jamb 2012 Physics Questions

Question 71:
A cell of internal resistance 1Ω supplies current to an external resistor of 3Ω. The efficiency of the cell is
  • A 25%
  • B 33%
  • C 50%
  • D 75%
View Answer & Explanation
Question 72:
A conductor of length 2m carries a current of 0.8A while kept in a magnetic field of magnetic flux density 0.5T. The maximum force acting on it is
  • A 0.2N
  • B 0.8N
  • C 3.2N
  • D 8.0N
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Question 73:
Light of energy 5eV falls on a metal of work function 3eV and electrons are liberated. The stopping potential is
  • A 1.7V
  • B 2.0V
  • C 8.0V
  • D 15.0V
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Question 74:
The height at which the atmosphere ceases to exist is about 80km. If the atmospheric pressure on the ground level is 760mmHg, the pressure at a height of 20km above the ground level is
  • A 380mmHg
  • B 570mmHg
  • C 190mmHg
  • D 480mmHg
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Question 75:
A stone of mass 1kg is dropped from a height of 10m above the ground and falls freely under gravity. Its kinetic energy 5m above the ground is then equal to
  • A Its kinetic energy on the ground
  • B Twice its initial potential energy
  • C Its initial potential energy
  • D Half its initial potential energy
View Answer & Explanation