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Monday, 02 November 2026
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Physics Past Questions and Answers

Jamb 1985 Physics Questions

Question 31:
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 32:
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 33:
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
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Question 34:
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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Question 35:
Which of the following methods CANNOT be used to produce a steel magnet? The
  • A Passing of an electric current through a solenoid
  • B Repeated stroking of the specimen with a magnet
  • C Repeated stroking of the specimen in opposite directions with magnets
  • D Heating of the specimen
  • E Hammering of the specimen in the earth's magnetic field
View Answer & Explanation