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Physics 2018 JAMB Past Questions

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26

If the fraction of the atoms of a radioactive material left after 120years is \(\frac{1}{64}\), what is the half-life of the material?  \(\frac{1}{64}\)

  • A. 20 years
  • B. 10 years
  • C. 2 years
  • D. 24 years
View Answer & Discuss (9) JAMB 2018
27

In the diagram shown, which of the simple pendulum will resonate with P when set into oscillation?

  • A. U
  • B. T
  • C. R and T
  • D. Q and R
View Answer & Discuss (1) JAMB 2018
28

The time rate of loss of heat by a body is proportional to the

  • A. temperature of its surroundings
  • B. temperature of the body
  • C. difference in temperature between the body and its surroundings
  • D. ratio of the temperature of the body to that of its surroundings
View Answer & Discuss (1) JAMB 2018
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29

A positively charged rod X is brought near an uncharged metal sphere Y and is then touched by a finger with X still in place. When the finger is removed, the result is that Y has

  • A. no charge and a zero potential
  • B. a positive charge and a zero potential
  • C. a negative charge and a positive potential
  • D. a negative charge and a negative potential
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30

Electrical appliances in homes are normally earthed so that

  • A. a person touching the appliances is safe from electric shock
  • B. both the a.c. and d.c. sources can be used
  • C. the appliances are maintained at a higher pd than the earth
  • D. the appliances are maintained at a lower pd than the earth
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