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Wednesday, 20 May 2026
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Physics Past Questions and Answers

Jamb 1985 Physics Questions

Question 31:
A convex mirror is used as a driving mirror because i. its image is erect. ii. it has a large field of view. iii. it has a long focal length. Identify the CORRECT statement(s)
  • A I andiii only
  • B I and ii only
  • C Ii and iii only
  • D I, ii, and iii only
  • E I only
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Question 32:
Two rays of light from a point below the surface of water are equally inclined to each other at 60o in water. What is the angle between the rays when they emerge into air? (Take the refractive index of water to be \(\frac{4}{3}\))
  • A 41.8<sup style='font-size: smaller;'>o</sup>
  • B 44.1<sup style='font-size: smaller;'>o</sup>
  • C 60.0<sup style='font-size: smaller;'>o</sup>
  • D 83.6<sup style='font-size: smaller;'>o</sup>
  • E 120.0<sup style='font-size: smaller;'>o</sup>
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Question 33:
A narrow beam of white light can be split up into different colours by a glass prism. The correct explanation is that
  • A White light is an electromagnetic wave
  • B The prism has all the colours of the white light
  • C White light has undergone total internal reflection in the prism
  • D Different colours of white light travel with different speeds in glass
  • E White ligth consist of yellow, green and red colours
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Question 34:
A charge of one coulomb liberates 0.0033g of copper in an electrolytic process. How long will it take a current of 2A to librate 1.98g of copper in such a process?
  • A 5 mins
  • B 30 mins
  • C 50 mins
  • D 60 mins
  • E 120 mins
View Answer & Explanation
Question 35:
If the distance between two stationary charged particle is doubled, the magnitude of the electro-static force between them will be
  • A Doubled
  • B Halved
  • C A quarter of its former value
  • D Unchanged
  • E Four times the original value
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