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Wednesday, 28 October 2026
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Physics Past Questions and Answers

Jamb 1979 Physics Questions

Question 36:
Radio carrier waves are generated by causing electrons to oscillate rapidly in
  • A A microphone
  • B A television camera
  • C An antenna
  • D Coaxial cables
  • E A transmitter
View Answer & Explanation
Question 37:
Which of the following statements is correct? Silvered walls of a vacuum flask are used to prevent
  • A Heat loss due to conduction
  • B Vacuum loss
  • C Heat entry into the inner flask due to convection
  • D Heat loss due to radiation
  • E Heat loss due to convection
View Answer & Explanation
Question 38:
A concave lens of focal length 20cm form an image 1/2 the size of the object. The object distance is
  • A 100cm
  • B \( \frac{100}{q} \)
  • C 60cm
  • D \( \frac{60}{7} \)
  • E None of the above
View Answer & Explanation
Question 39:
The diagram shows lens arrangement in
  • A A Compound Microscope
  • B Astronomical telescope
  • C Binocular
  • D Periscope
  • E Projection lantern
View Answer & Explanation
Question 40:
In a given circuit, the cell P has an emf 1.5V and an unknown internal resistance while cell Q has an emf 2.0V and an internal resistance of 1 ohm if the ammeter reads 50m A, Then r is equal to
  • A 0.5 ohm
  • B 0.62 ohm
  • C 1.0 ohm
  • D 2.0 ohm
  • E 3.0 ohm
View Answer & Explanation