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Friday, 30 October 2026
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Physics Past Questions and Answers

Jamb 1981 Physics Questions

Question 41:
If I is the current passing through a metallic resistor and H is the rate of Heat generated in the resistor at a constant temperature, then
  • A H \(\alpha\) \(\frac{1}{I}\)
  • B H \(\alpha\) \(\frac{1}{I^2}\)
  • C H \(\alpha\) \(\sqrt1\)
  • D H \(\alpha\) I<sup style='font-size: smaller;'>2</sup>
  • E None of the above
View Answer & Explanation
Question 42:
A solid weighs 4.8g in air, 2.8g in water and 3.2g in kerosine. The ratio of density of the solid to that of the kerosine is
  • A 12
  • B 3
  • C 2
  • D \(\frac{3}{2}\)
  • E \(\frac{5}{4}\)
View Answer & Explanation
Question 43:
A body of mass 6kg rests on an inclined plane. The normal reaction is R and the limiting frictional force is F as shown in the image above. if F = 30N, and g = 10ms2 then the angle of inclination \( \theta \) is
  • A \( 15^{\circ} \)
  • B \( 30^{\circ} \)
  • C \( 45^{\circ} \)
  • D \( 60^{\circ} \)
  • E \( 75^{\circ} \)
View Answer & Explanation
Question 44:
The effect of closing the key K in the circuit shown above would be to
  • A Increase the current by 0.6A
  • B Reduce the current by 0.6A
  • C Increase the current by 0.4A
  • D Keep the current unchanged
View Answer & Explanation
Question 45:
The wave motion above has a frequency
  • A 0.1Hz
  • B 0.2Hz
  • C 5Hz
  • D 10Hz
  • E 100Hz
View Answer & Explanation