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Tuesday, 03 November 2026
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Physics Past Questions and Answers

Jamb 2012 Physics Questions

Question 61:
What optical instrument can best be constructed with converging lenses of focal lengths 50cm and 5cm?
  • A Compound microscope
  • B Galileo's telescope
  • C Terrestrial telescope
  • D Astronomical telescope
View Answer & Explanation
Question 62:
in a pure semiconductor, the number of electrons in the conduction band is
  • A Less than the number of holes in the valence band
  • B Equal to the number of holes in the valence band
  • C Greater than the number of holes in the valence band
  • D Twice the number of holes in the valence band
View Answer & Explanation
Question 63:
In a thermonuclear reaction, the total initial mass is 5.02 x \(10^{-{2}{7}}\)kg and the total final mass is 5.01 x \(10^{-{2}{7}}\)kg. The energy released in the process is
[c = 3.0 x \(10^8\) ms-1]
  • A 9.0 x 10<sup style='font-size: smaller;'>-13</sup>J
  • B 9.0 x 10<sup style='font-size: smaller;'>-12</sup>J
  • C 9.0 x 10<sup style='font-size: smaller;'>-11</sup>J
  • D 9.0 x 10<sup style='font-size: smaller;'>-10</sup>J
View Answer & Explanation
Question 64:
A gas would serve as an electrical conductor under
  • A Reduced pressure and high current
  • B Increased magnetic field
  • C Reduced pressure and reduced potential
  • D Exposure to visible light
View Answer & Explanation
Question 65:
If ∆x is the uncertainty in the measurement of the position of a particle along the x-axis and ∆Pa is the uncertainty in the measurement of the linear momentum along the x-axis, then the uncertainty principle relation is given as
  • A ∆x ∆P<sub style='font-size: smaller;'>x</sub> ≥ h
  • B ∆x ∆P<sub style='font-size: smaller;'>x</sub> = 0
  • C ∆x ∆P<sub style='font-size: smaller;'>x</sub> < h
  • D ∆x ∆P<sub style='font-size: smaller;'>x</sub> = âˆÅ¾
View Answer & Explanation