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Wednesday, 28 October 2026
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Physics Past Questions and Answers

Jamb 2003 Physics Questions

Question 26:
I the diagram above, what would happen to the current I, if another resistor, R2, is connected in parallel to R1?
  • A It will increase because the equivalent resistance will increase
  • B It will decrease if R<sub style='font-size: smaller;'>2</sub> is greater than R<sub style='font-size: smaller;'>1</sub>
  • C It will increase because the effective resistance will decrease
  • D It will decrease if R<sub style='font-size: smaller;'>2</sub> is less than R<sub style='font-size: smaller;'>1</sub>
View Answer & Explanation
Question 27:
A wire of 5Ω resistance is drawn out so that its new length is two times the original length. If the resistivity of the wire remains the same and the cross-sectional area is halved, the new resistance is
  • A 40Ω
  • B 20Ω
  • C 10Ω
  • D 5Ω
View Answer & Explanation
Question 28:
An electron of charge 1.6 x 10-19C is accelerated between two metal plates. If the kinetics energy of the electron is 4.8 x 10-17J, the potential difference between the plate is
  • A 30V
  • B 40V
  • C 300V
  • D 400V
View Answer & Explanation
Question 29:
A magnetic field is said to exist at a point if a force is
  • A Exerted on a stationary charge at the point
  • B Exerted on a moving charge at the point
  • C Deflected at the point
  • D Strengthened at the point
View Answer & Explanation
Question 30:
I It retains its magnetic much longer than steel.
II It is more easily magnetized than steel
III It is more easily demagnetized than steel
IV It produces a stronger magnet than steel
Which combination of the above makes iron preferable to steel in the making of electromagnets?
  • A I and II only
  • B II and III only
  • C I, III, and IV only
  • D II, III and IV only
View Answer & Explanation