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Monday, 02 November 2026
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Physics Past Questions and Answers

Jamb 2007 Physics Questions

Question 31:
The fundamental frequency of a plucked wire under a tension of 400N is 250Hz. When the frequency is changed to 500 Hz at constant length, the tension is
  • A 1600N
  • B 400N
  • C 160N
  • D 40N
View Answer & Explanation
Question 32:
Three cells each of e.m.f 1.5 V and internal resistance 2.5Ω are connected as shown in the diagram above. Find the net e.m.f and the internal resistance
  • A 1.5V, 7.50Ω
  • B 1,5V, 0.83Ω
  • C 4.5V, 7.50Ω
  • D 4.5V, 0.83Ω
View Answer & Explanation
Question 33:
In the diagram above , if the magnetic field points into the paper and the force on a current - carrying conductor points upwards, what is the direction of the current?
  • A Upwards
  • B Downwards
  • C Right
  • D Left
View Answer & Explanation
Question 34:
The instantaneous value of the induced e.m.f as a function of time is ε = εo sin ωt where εo is the peak value of the e.m.f. The instantaneous value of the e.m.f., one quarter of the period is
  • A 0.00
  • B <sup style='font-size: smaller;'>ε<sub style='font-size: smaller;'>o</sub></sup>/<sub style='font-size: smaller;'>4</sub>
  • C <sup style='font-size: smaller;'>ε<sub style='font-size: smaller;'>o</sub></sup>/<sub style='font-size: smaller;'>2</sub>
  • D ε<sub style='font-size: smaller;'>o</sub>
View Answer & Explanation
Question 35:
During the nuclear reaction described by W → X→ Y
235 235 231
92 93 91




the particles emitted are respectively
  • A α and α
  • B α and β
  • C β and β
  • D β and α
View Answer & Explanation