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Wednesday, 28 October 2026
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Physics Past Questions and Answers

Jamb 1997 Physics Questions

Question 36:
The power dissipated in an a.c. circuit with an r.m.s, current of 5A, r.m.s voltage of 10V and a phase angle of 60o is
  • A 25W
  • B 50W
  • C 120W
  • D 125W
View Answer & Explanation
Question 37:
The voltage of the domestic electric supply is represented by the equation V = 311 sin314.2t. Determine the frequency of the a.c. supply [\(\pi\) = 3.142]
  • A 50.0Hz
  • B 100.0Hz
  • C 311.0Hz
  • D 314.2Hz
View Answer & Explanation
Question 38:
In a purely inductive circuit, the current
  • A Lags behind the voltage in phase by 90<sup style='font-size: smaller;'>o</sup>
  • B Leads the voltage in phase by 90<sup style='font-size: smaller;'>o</sup>
  • C Is in the same phase with the voltage
  • D Leads the voltage by 180<sup style='font-size: smaller;'>o</sup>
View Answer & Explanation
Question 39:
One of the features of the fission process is that
  • A Its products are not radioactive
  • B It leads to chain reaction
  • C Neutrons are not released
  • D The sum of the masses of the reactants equals the sum of masses of the products
View Answer & Explanation
Question 40:
The graphite rods surrounding the uranium fuel rods in a nuclear reactor, are used to
  • A Absorb the neutrons and hence halt the nuclear process
  • B Create the neutrons and hence slow up the nuclear process
  • C Slowdown the neutrons and hence slow up the nuclear process
  • D Speed up the neutrons and hence speed up the nuclear process
View Answer & Explanation