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Wednesday, 28 October 2026
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Physics Past Questions and Answers

Jamb 1978 Physics Questions

Question 31:
Every house supplied with electricity is provided with a box of fuses so that
  • A The consumption of electricity can be recorded
  • B People residing in the house will not have an electric shock if they touch a live wire
  • C The total current drawn from the mains can be limited
  • D The voltage supply can be stabilized
  • E It serves as a standby supply when there is a power failure
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Question 32:
An electric charge could be transmitted through
  • A Wood, rubber and stone
  • B Paper, clay and plastic
  • C Glass, acid and cloth
  • D The human body, water and metals
  • E All of the above
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Question 33:
a guitar string is 75cm long. the wavelength of its fundamental note is
  • A 75cm
  • B 150cm
  • C 37.5cm
  • D 112cm
  • E 50cm
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Question 34:
The boys are communicating with each other by stretching a string passing through a hole punched in the bottom of each of two tin cans. The physical principle employed is that sound travels
  • A Mainly through air
  • B Fainter in stretched string
  • C Faster through gases than in solids and liquids
  • D With greater ease through a string than in air
  • E None of the above is correct
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Question 35:
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