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Monday, 15 June 2026
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Physics Past Questions and Answers

Jamb 1978 Physics Questions

Question 36:
A herdsman yelling out to fellow herdsman heard his voice reflected by cliff 4s later. What is the velocity of sound in air if the cliff is 680m away?
  • A 170ms<sup style='font-size: smaller;'>-1</sup>
  • B 136ms<sup style='font-size: smaller;'>-1</sup>
  • C 340ms<sup style='font-size: smaller;'>-1</sup>
  • D 680ms<sup style='font-size: smaller;'>-1</sup>
  • E 510ms<sup style='font-size: smaller;'>-1</sup>
View Answer & Explanation
Question 37:
an object 1cm high placed on the axis 15cm from a converging lens forms an image 30cm from the lens. The size of the image is
  • A 0.5cm
  • B 1.5cm
  • C 3cm
  • D 2.5m
  • E 2cm
View Answer & Explanation
Question 38:
The visible part of light consists of the following colours
  • A Red, indigo, infra-red, violet, yellow, green and blue
  • B Red, green, blue, violet, indigo, orange and yellow
  • C Blue, ultra-violet, infra-red, red, yellow, indigo, violet,green and orange
  • D Infra-red and ultra-violet
  • E Red, orange, yellow, green, blue, indigo and infra-red
View Answer & Explanation
Question 39:
An object is positioned between two plane mirrors inclined at right angles to each other. The object is 1 unit distance from each mirror, the number of images formed is
  • A 1
  • B 2
  • C 3
  • D 4
  • E 5
View Answer & Explanation
Question 40:
The angular dispersion of a prism depends on
  • A The index of refraction only
  • B The angle of incidence as well as the index of refraction
  • C The angle of incidence only
  • D The thickness of the prism
  • E The prism angle
View Answer & Explanation