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Physics 1980 JAMB Past Questions

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36
A man stands one-third of the way between two walls and claps his hands, He hears two distinct echoes 1s apart. If the speed of sound is 330ms-1 the distance between the wall is
  • A. 33m
  • B. 110m
  • C. 220m
  • D. 330m
  • E. 495m
View Answer & Discuss (7) JAMB 1980
37

A cell has an open circuit voltage V1 and a closed circuit voltage V2 when a current is flowing through it. Therefore, the internal resistance of the cell is

  • A. \(\frac{V_2}{I}\)
  • B. \(\frac{V_1}{I}\)
  • C. \(\frac{(V_1 + V_2)}{I}\)
  • D. \(\frac{(V_1 - V_2)}{I}\)
  • E. \(\frac{(V_2 - V_1)}{I}\)
View Answer & Discuss (13) JAMB 1980
38
According to Ohm's law, the ratio V/I is constant for
  • A. an electrolyte
  • B. a diode
  • C. a transistor
  • D. silver
  • E. all of the above
View Answer & Discuss (5) JAMB 1980
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39
In the process of electrification by induction, the amount of induced charge in relation to the inducing charge is the
  • A. same in sign and quantity
  • B. same in sign but greater
  • C. opposite in sign but greater
  • D. opposite in sign but less
  • E. opposite in sign but equal
View Answer & Discuss (7) JAMB 1980
40

The activity of a radioactive substance depends on

  • A. temperature and purity
  • B. temperature and age
  • C. purity and age
  • D. age, purity and temperature
  • E. none of the above
View Answer & Discuss (21) JAMB 1980
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