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Friday, 30 October 2026
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Physics Past Questions and Answers

Jamb 1981 Physics Questions

Question 36:
The extension in a spring when 5g wt was hung from it was 0.56cm. If Hooke's law is obeyed, What is the extension caused by a load of 20g wt?
  • A 1.12m
  • B 2.14cm
  • C 2.52cm
  • D 2.80cm
  • E 2.24cm
View Answer & Explanation
Question 37:
Which of the following is NOT directly associated with direct current (DC)?
  • A A dry cell
  • B A moving coil galvanometer
  • C A transformer
  • D A lead- acid accumulator
  • E A commutator
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Question 38:
The relationship between the period T and the length T of a smile pendulum is T = 2\( \pi \) \( ( \frac{I}{g}) ^{ \frac{1}{2} } \). From experiment data of T and I, one can obtain the following graphs, i. T vs.I ii. T vs I2 iii. T2 vs. I iv. T vs \( \sqrt{I} \) v. logT vs logI. Which of the following graphs, are linear?
  • A All
  • B Only i and ii
  • C Only iii and iv
  • D Iii,iv and v
  • E None of them
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Question 39:
A transformer has 300 turns of wire in the primary coil and 30 turns in the secondary coil.If the input voltage is 100 volts, the output voltage is
  • A 5 volts
  • B 10 volts
  • C 15 volts
  • D 20 volts
  • E 25 volts
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Question 40:
A closed coil of wire is placed near a magnet. The magnet lies along the axis of the coil. Under which of the following conditions would there be no current in the coil?
  • A When the coil is moved toward the stationary magnet
  • B When the coil is moved away from the stationary magnet
  • C When the coil is held stationary but the magnet is moved towards the coil
  • D When both the coil and the magnet are held stationary
  • E When the coil is held stationary but the magnet is moved away from the cell
View Answer & Explanation