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Monday, 15 June 2026
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Physics Past Questions and Answers

Jamb 1978 Physics Questions

Question 31:
The electric supply from Kainji Dam is transmitted at high voltages of the order hundreds of kilovolts but is converted to domestic use of about 220 volts by
  • A Commutators
  • B Transistors
  • C Valves and diodes
  • D Rectifiers
  • E Transformers
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Question 32:
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 33:
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 34:
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 35:
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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