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Saturday, 31 October 2026
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Physics Past Questions and Answers

Jamb 1988 Physics Questions

Question 26:
When white light is dispersed by a spectrometer, the component having the shortest wavelength is
  • A Orange
  • B Green
  • C Violet
  • D Red
View Answer & Explanation
Question 27:
Which of the following statement is TRUE of ultraviolet, visible and infra-red rays?
  • A They are all electromagnetic waves with the same wavelength
  • B Ultra-violet rays have shorter wavelengths than infra-red rays and produce flourescence
  • C Infrared rays have shorter wavelength than visible light and produce the sensation of heat
  • D The wavelenghts increase in the sequence: visible, ultra-violet, infra-red
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Question 28:
A spectrum of sunlight is said to be impure when
  • A It is made of only three colours
  • B It has no red colour in it
  • C The different colours in it overlap
  • D It does not contain white light
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Question 29:
A cell of internal resistance 2 ohms supplies current to a 6 ohms resistor. The efficiency of the cell is
  • A 12.0%
  • B 25.0%
  • C 33.3%
  • D 75.0%
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Question 30:
When a resistance R is across a cell, the voltage across the terminals of the cell is reduced to two-third of its normal value. The internal resistance of the cell is
  • A \(\frac{2}{1}\)R
  • B \(\frac{1}{2}\)R
  • C \(\frac{3}{2}\)R
  • D 5R
View Answer & Explanation