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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 & Discuss (3) JAMB 2000
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
View Answer & Discuss (5) JAMB 2000
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
View Answer & Discuss (17) JAMB 2000
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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
View Answer & Discuss (19) JAMB 2001
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 & Discuss (10) JAMB 2001
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