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Tuesday, 03 November 2026
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Physics Past Questions and Answers

Jamb 2012 Physics Questions

Question 66:
An electric generator with a power output of 3.0KW at a voltage of 1.5KV distributes power along cables of resistance 20.0Ω. The power loss in the cables is
  • A 80.0W
  • B 40.0W
  • C 10.0W
  • D 0.1W
View Answer & Explanation
Question 67:
If the frequency of an emitted x-ray is 1.6 x 1016Hz, the accelerating potential is?
[e = 1.6 x 10-19C, h = 6.63 x 10-34Js]
  • A 6630.0V
  • B 663.0V
  • C 66.3V
  • D 6.6V
View Answer & Explanation
Question 68:
If the fraction of the atoms of a radioactive material left after 120years is 1/64, what is the half-life of the material?
  • A 24 years
  • B 20 years
  • C 10 years
  • D 2 years
View Answer & Explanation
Question 69:
A certain radioactive source emits radiations that were found to be deflected by both magnetic and electric fields. The radiations are
  • A Beta rays
  • B Gamma rays
  • C X-rays
  • D Unltr-violet rays
View Answer & Explanation
Question 70:
A 2H inductor has negligible resistance and is connected to a 50/Ï€ Hz A.C. Supply. The reactance of the inductor is
  • A 200 Ω
  • B 50 Ω
  • C 100/Ï€ Ω
  • D 25/Ï€ Ω
View Answer & Explanation