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Saturday, 31 October 2026
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Physics Past Questions and Answers

Jamb 1991 Physics Questions

Question 21:
Which of the following is TRUE of light and sound waves?
  • A They both transmit energy
  • B They both need a mediumfor propagation
  • C They are both transverse waves
  • D Their velocities in air are equal
View Answer & Explanation
Question 22:
The image in a pin-hole camera is
  • A Errect and formed by refraction through a lens
  • B Virtual and formed by dispersion
  • C Erect and gets sharper as the hole becomes larger
  • D Inverted and formed by the light from each point travelling in a straight line
View Answer & Explanation
Question 23:
When a plane mirror at which a ray is incident is rotated through an angle \( \theta \), the reflected ray will be rotated through
  • A \(\frac{1}{2}\)\(\theta\)
  • B \(\theta\)
  • C 2\(\theta\)
  • D 3\(\theta\)
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Question 24:
A trough 12.0cm deep is filled with water of refractive index \(\frac{4}{3}\). By how much would a coin at the bottom of the trough appear to be displaced when viewed vertically from above the water surface?
  • A 3.0cm
  • B 6.0cm
  • C 9.0cm
  • D 16.0cm
View Answer & Explanation
Question 25:
In a ray diagram for a thin converging lens, a ray that is not parallel to the optic axis but passes through the optic center will
  • A Pass through undeviated
  • B Pass through the center of curvature after refraction
  • C Emerge parallel to the principal axis
  • D Pass through the principal focus after refraction
View Answer & Explanation