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Friday, 30 October 2026
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Physics Past Questions and Answers

Jamb 1990 Physics Questions

Question 41:
A substance has a half of 3mins. after 6mins. the count rate was observed to be 400. What was its count rate at zero time?
  • A 200
  • B 1200
  • C 1600
  • D 2400
View Answer & Explanation
Question 42:
The photocell works on the principle of the
  • A Voltaic cell
  • B Emision of electrons by incident radiation
  • C Emision of protons by incident electrons
  • D Photographic plate
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Question 43:
What is the reading of the vernier scale above
  • A 1.88cm
  • B 1.80cm
  • C 1.28cm
  • D 1.97cm
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Question 44:
Two horizontal forces, 10N and 8N and another force F1 inclined at 30 to the vertical acting as shown in the diagram above, keep the body P in equilibrium, The weight of the body is
  • A 2√3/3N
  • B √2N
  • C 4√3/3
  • D 2V3N
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Question 45:
What is the average velocity of the sprinter whose velocity time graph is as shown above
  • A 85.0ms<sup style='font-size: smaller;'>-1</sup>
  • B 17.0ms<sup style='font-size: smaller;'>-1</sup>
  • C 8.5ms<sup style='font-size: smaller;'>-1</sup>
  • D 1.7ms<sup style='font-size: smaller;'>-1</sup>
View Answer & Explanation