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Physics 1978 JAMB Past Questions

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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
View Answer & Discuss (3) JAMB 1978
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
View Answer & Discuss (5) JAMB 1978
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
View Answer & Discuss (10) JAMB 1978
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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
View Answer & Discuss (9) JAMB 1978
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-1
  • B. 136ms-1
  • C. 340ms-1
  • D. 680ms-1
  • E. 510ms-1
View Answer & Discuss (15) JAMB 1978
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