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Wednesday, 28 October 2026
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Physics Past Questions and Answers

Jamb 1979 Physics Questions

Question 31:
The speed of light in air is 3 x 108ms-1. If the refractive index of light from air-to-water is \(\frac{4}{3}\), then which of the following is the correct value of the speed of light in water?
  • A 4 x 10<sup style='font-size: smaller;'>8</sup>ms<sup style='font-size: smaller;'>-1</sup>
  • B 2.25 x 10<sup style='font-size: smaller;'>8</sup>ms<sup style='font-size: smaller;'>-1</sup>
  • C \(\frac{4}{9}\) x 10<sup style='font-size: smaller;'>8</sup>ms<sup style='font-size: smaller;'>-1</sup>
  • D 2.25 x 10<sup style='font-size: smaller;'>2</sup>ms<sup style='font-size: smaller;'>-1</sup>
  • E 4.33 x 10<sup style='font-size: smaller;'>8</sup>ms<sup style='font-size: smaller;'>-1</sup>
View Answer & Explanation
Question 32:
On which of the following is the operation of a moving coil galvanometer based?
  • A Magnetic effect of electric current
  • B Electromagnetic induction
  • C Chemical reaction produced by electricity
  • D Force on current carrying conductor in a magnetic field
  • E Electrical energy and power
View Answer & Explanation
Question 33:
A body is released from rest and allowed to fall freely from a given height under gravity. The kinetic energy at its half-way point is
  • A A little above half of its initial energy
  • B A little below half of its initial energy
  • C A half of its initioal energy
  • D A little above its initial energy
  • E A little below its initial energy
View Answer & Explanation
Question 34:
It is known that a neutron exists in a light atomic nucleus. Which of the following also exists in the nucleus?
  • A An electron
  • B A \(\beta\)-particle
  • C An \(\alpha\)-particle
  • D A proton
  • E An atom
View Answer & Explanation
Question 35:
A weight of 1000 grams hangs from a lever 20cm to the fulcrum. At the left is a 500-gram weight 20cm from the fulcrum, and a 200-gram weight x cm away from the fulcrum. What is the value of x that will make the lever balanced?
  • A 50cm
  • B 20cm
  • C 10cm
  • D 30cm
  • E 70cm
View Answer & Explanation