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Wednesday, 28 October 2026
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Physics Past Questions and Answers

Jamb 2003 Physics Questions

Question 36:
The force on a charge moving with velocity v in a magnetic field B is half of the maximum force when the angle between v and B is
  • A 90<sup style='font-size: smaller;'>o</sup>
  • B 45<sup style='font-size: smaller;'>o</sup>
  • C 30<sup style='font-size: smaller;'>o</sup>
  • D 0<sup style='font-size: smaller;'>o</sup>
View Answer & Explanation
Question 37:
The maximum kinetic energy of the photoelectron emitted from a metal surface is 0.34eV. If the work function of the metal surface is 1.83eV,find the stopping potential.
  • A 2.17V
  • B 1.49V
  • C 1.09V
  • D 0.34V
View Answer & Explanation
Question 38:
When an alternating current given by I = 10sin (120π)t passes through a 12Ω resistor, the power dissipated in the resistor is
  • A 1200W
  • B 600W
  • C 120W
  • D 30W
View Answer & Explanation
Question 39:
In a semi conductor junction diode, as the depletion or barrier layer is forward-biased, the layer
  • A Widens
  • B Narrows
  • C Remains constant
  • D Widens then narrows
View Answer & Explanation
Question 40:
The major difference between a pure semiconductor and a pure metal is that
  • A Metals are harder than semiconductor
  • B While resistance of metals decrease with temperature , the reverse is the case for semiconductor
  • C The resistance of metals increases with temperature, while for semiconductors, it is the reverse
  • D Metals have forbidden gaps while semiconductors have not
View Answer & Explanation