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Wednesday, 28 October 2026
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Physics Past Questions and Answers

Jamb 1997 Physics Questions

Question 26:
If the load at the end of a sonometer wire is immersed in a bucket of water, the original fundamental frequency of the wire could be restored by
  • A Decrease the length of the wire
  • B Increasing the length of the wire
  • C Increasing the mass per unit length of the wire
  • D Changing the temperature of the wire
View Answer & Explanation
Question 27:
A boy on looking into a mirror observed that his face appeared to have grown bigger. The boy must have been looking at a
  • A Convex mirror with his face at the focus
  • B Concave mirror with his face between the focus and the mirror
  • C Concave mirror with his face at the focus
  • D Convex mirror with his face between the focus and the mirror
View Answer & Explanation
Question 28:
Light of velocity 3 x 108ms-1 is incident on a material of reflective of index n. If the velocity of light is reduced to 2.4 x 108ms-1 in the material, what is n?
  • A 2.33
  • B 2.25
  • C 1.33
  • D 1.25
View Answer & Explanation
Question 29:
The electromagnetic waves that are sensitive to temperature changes are
  • A X-rays
  • B Gamma-rays
  • C Ultra-violet rays
  • D Infra-red rays
View Answer & Explanation
Question 30:
Three electric cells each of e.m.f 1.5V and internal resistance of 1.0\(\Omega\) are connected in parallel across an external resistance of \(\frac{2}{3}\)\(\Omega\). Calculate the value of the current in the resistor
  • A 0.5 A
  • B 0.9A
  • C 1.5A
  • D 4.5A
View Answer & Explanation