Search SchoolNGR

Friday, 22 May 2026
Register . Login

Physics Past Questions and Answers

Jamb 1998 Physics Questions

Question 41:
A transformer which can produce 8V from a 240v a.c. supply, has an efficiency of 80%. If the current in the secondary coil is 15A, calculate the current in the primary coil.
  • A 0.625A
  • B 1.600A
  • C 2.500A
  • D 6.250A
View Answer & Explanation
Question 42:
The electrochemical equivalent of a metal is 1.3 x 10-7kgC-1. The mass of the metal which 2.0 x 104C of electricity will deposit from a suitable electrolyte is
  • A 6.5 x 10<sup style='font-size: smaller;'>-2</sup>kg
  • B 2.6 x 10<sup style='font-size: smaller;'>-2</sup>kg
  • C 6.5 x 10<sup style='font-size: smaller;'>-3</sup>kg
  • D 2.6 x 10<sup style='font-size: smaller;'>-3</sup>kg
View Answer & Explanation
Question 43:
In a nuclear fusion experiment, the loss of mass amounts to 1.0 x 10-6kg. The amount of energy obtained from the fusion is
  • A 3.0 x 10<sup style='font-size: smaller;'>-4</sup>J
  • B 3.0 x 10<sup style='font-size: smaller;'>-1</sup>J
  • C 9.0 x 10<sup style='font-size: smaller;'>4</sup>J
  • D 9.0 x 10<sup style='font-size: smaller;'>10</sup>J
View Answer & Explanation
Question 44:
In photoelectric effect, electrons will leave the metal surface when illuminated by light of appropriate frequency if the photon energy is
  • A Greater than the work function
  • B Less than the work function
  • C Equal to the work function
  • D Equal to the maximium kinetic energy of the electron
View Answer & Explanation
Question 45:
A body on the ground is acted on by a force of 10N at a point P as shown in the fig above. What force is needed to stop the body from moving eastwards
  • A 5N in the direction of east
  • B 5N in the diretion of west
  • C 5V3N in the direction of west
  • D 10N in the southwest direction
View Answer & Explanation