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Wednesday, 29 July 2026
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Physics Past Questions and Answers

Jamb 2019 Physics Questions

Question 26:
A straight wire 15cm long, carrying a current of 6.0A is in a uniform field of 0.40T. What is the force on the wire when it is at right angle to the field
  • A 0.46N
  • B 0.35N
  • C 0.36N
  • D 0,24N
View Answer & Explanation
Question 27:
The pitch of a screw jack is 0.45cm and the arm is 60cm long. If the efficiency of the Jack is 75/Ï€ %, calculate the mechanical advantage.
  • A 400
  • B 300
  • C 200
  • D 150
View Answer & Explanation
Question 28:
When the downward current flows in a straight vertical conductor, the direction of its magnetic field at a point due north of the wire is
  • A Upward
  • B North
  • C South
  • D West
View Answer & Explanation
Question 29:
Aluminium is sometimes used as the leaf of an electroscope because it
  • A Is a light material
  • B Is a good conductor
  • C Is a good insulator
  • D Can be converted into thin sheets
View Answer & Explanation
Question 30:
The diagram above represents the stress-strain graph of a loaded wire. Which of these statements is correct?
  • A At J, the wire becomes plastic
  • B J is the yield point
  • C L is the elastic limit
  • D At K, the wire breaks
View Answer & Explanation