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Wednesday, 04 November 2026
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Physics Past Questions and Answers

Jamb 2012 Physics Questions

Question 91:
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 92:
A student is at a height 4m above the ground during a thunderstorm. Give that the potential difference between the thundercloud and the ground is 107v, the electric field created by the storm is
  • A 2.0 * 10<sup style='font-size: smaller;'>6</sup> NC <sup style='font-size: smaller;'>-1</sup>
  • B 2. 5 * 10<sup style='font-size: smaller;'>6</sup> NC <sup style='font-size: smaller;'>-1</sup>
  • C 1.0 * 10<sup style='font-size: smaller;'>7</sup> NC <sup style='font-size: smaller;'>-1</sup>
  • D 4.0 * 10<sup style='font-size: smaller;'>7</sup> NC <sup style='font-size: smaller;'>-1</sup>
View Answer & Explanation
Question 93:
A working electric motor takes a current of 1.5 A when the p.d across it is 250V. If its efficiency is 80%, the power output is
  • A 300.0W
  • B 469.0W
  • C 133.0W
  • D 4.8W
View Answer & Explanation
Question 94:
The cost of running five 60 W lamps and four 100 W lamps for 20 hours if electrical energy cost #10.00 per kwh is
  • A 280.00
  • B 160.00
  • C 120.00
  • D 140.00
View Answer & Explanation
Question 95:
In a Daniel cell, the depolarizer, positive and negative electrodes are respectively
  • A Copper sulphate, copper and zinc
  • B Manganese dioxide, carbon and zinc
  • C Sulphuric acid, lead oxide and lead
  • D Potassium hydroxide, nickel and iron.
View Answer & Explanation