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Physics 1985 JAMB Past Questions

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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. 41.8o
  • B. 44.1o
  • C. 60.0o
  • D. 83.6o
  • E. 120.0o
View Answer & Discuss (13) JAMB 1985
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
View Answer & Discuss (2) JAMB 1985
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
View Answer & Discuss (1) JAMB 1985
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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
View Answer & Discuss (6) JAMB 1985
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 & Discuss (6) JAMB 1985
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