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Sunday, 16 August 2026
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Physics Past Questions and Answers

Topic: Efficiency of a cell

Jamb Physics Questions - Efficiency of a cell

Question 1:
The total power drawn from the cell in the circuit above is
  • A 12W
  • B 24W
  • C 32W
  • D 40W
View Answer & Explanation
Question 2:
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 3:
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
Question 4:
A resistance R is connected across the terminal of an electric cell of internal resistance 2Ω and the voltage was reduced to 3/5 of its nominal value.
The value of R is
  • A 3 Ω
  • B 2 Ω
  • C 1 Ω
  • D 6 Ω
View Answer & Explanation
Question 5:
A cell of internal resistance r is connected to an external resistor R. The conductor for maximum power transfer is?
  • A R < r
  • B R = r
  • C R = 2r
  • D R > r
View Answer & Explanation