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Wednesday, 20 May 2026
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Physics Past Questions and Answers

Jamb 1980 Physics Questions

Question 16:
The name given to the characteristics behaviour of substances which set their length perpendicular to a strong magnetic field instead of in line with it is
  • A Magnetization
  • B Paramagnetism
  • C Diamagnetism
  • D Demagnetization
  • E Ferromagnetism
View Answer & Explanation
Question 17:
Which of the following statements on the use of X-rays is incorrect? X-rays are used
  • A In hospitals to obtain photogaphs of tissues and bones in the body
  • B For the treatment of malignant growths like cancer cells
  • C In detecting fingerprints
  • D To reveal hidden flaws in metal castings and welded joints
  • E To detect alternations which have been made to works of art
View Answer & Explanation
Question 18:
What is the relative permitivity of a capacitor if its capacitance with a medium as dielectric is 16 farads and its capacitance with vacuum as dielectric is 2 farads?
  • A O
  • B \(\frac{1}{2}\)
  • C 2
  • D 8
  • E 32
View Answer & Explanation
Question 19:
If the magnification of a virtual image formed of an object 10cm from a convex lens is 3, then the focal length of the lens is
  • A 10cm
  • B 15cm
  • C 16cm
  • D 19cm
  • E 20cm
View Answer & Explanation
Question 20:
A quantity of sungas at -133[/sup] occupies 1/3m[sup]3 under pressure 1.4 x 105 Nm-2. if the gas occupies 31 m-2 at 37oC, its pressure will be
  • A 1.26 x 10<sup style='font-size: smaller;'>3</sup>Nm<sup style='font-size: smaller;'>-2</sup>
  • B 3.3 x10<sup style='font-size: smaller;'>4</sup>Nm<sup style='font-size: smaller;'>-2</sup>
  • C 1.35 x 10<sup style='font-size: smaller;'>4</sup>Nm<sup style='font-size: smaller;'>-2</sup>
  • D 2.2 x 10<sup style='font-size: smaller;'>4</sup>Nm<sup style='font-size: smaller;'>-2</sup>
  • E 10<sup style='font-size: smaller;'>5</sup>Nm<sup style='font-size: smaller;'>-2</sup>
View Answer & Explanation