Search SchoolNGR

Monday, 17 August 2026
Register . Login

Physics Past Questions and Answers

Topic: (a) Electromagnetic Induction

Jamb Physics Questions - (a) Electromagnetic Induction

Question 56:
What is the inductance (L) of an inductor whose reactance is 1Ω at 50/ π hertz (H)?
  • A 100 H
  • B 0.01H
  • C 10H
  • D 1H
View Answer & Explanation
Question 57:
The device in which one circuit controls another, especially if the current in the second circuit is large or dangerous is known as
  • A Electromagnetic devices
  • B Magnetic relay device
  • C None at all
  • D Sextant
View Answer & Explanation
Question 58:
Transformers are designed so that energy losses are reduced to a minimum. This is achieved through those process.
I. Using a soft iron ore
II. Laminating the iron core to reduce energy loses due to eddy current
III. Designing an efficient iron core
  • A I & II only
  • B II only
  • C I, II, & III only
  • D III only
View Answer & Explanation
Question 59:
Which of the following does Not use magnetic effect of current to function?
  • A Lead acid accumulator
  • B An electric bell
  • C A moving coil galvanometer
  • D A telephone receiver
View Answer & Explanation
Question 60:
Which of the following operations can be used to convert an alternative current dynamo into a direct current dynamo
  • A Number of turns in the coil is increased
  • B Strength of the field magnet is increased
  • C Slip rings are replaced with split ring cummutator
  • D Coil is wound on a soft iron armature
View Answer & Explanation