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Wednesday, 20 May 2026
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Physics Past Questions and Answers

Jamb 1985 Physics Questions

Question 46:
Which of the following features is NOT a characteristic of natural radioactivity?
  • A Radioactivity is a nuclear phenomenon
  • B Radioactivity is exhibited only by elements of mass number greater than 206
  • C The radioactivity of an element is affected by electric and magnetic fields in the surroundings
  • D Radioactive substances emits three types of radiations, a-rays, \(\beta\)-rays and y-rays
  • E The radioactive element is transformed into a new element
View Answer & Explanation
Question 47:
What is the number of neutrons in the Uranium isotope \(^{238}_{92}X\)?
  • A 92
  • B 146
  • C 238
  • D 330
  • E 119
View Answer & Explanation
Question 48:
Normal atmospheric pressure at sea-level is 105Nm-2 and the acceleration due to gravity is approximately 10ms-1. If the atmosphere has a uniform density of 1kgm-3, its height is
  • A 100m
  • B 1000m
  • C 10 000m
  • D 100 000m
  • E 1000 000m
View Answer & Explanation
Question 49:
In the Fig above, Current I passes through the combination, if the power dissipated in the 5 ohm resistor is 40W, then the power dissipated in the 10 ohm resistor is
  • A 10W
  • B 20W
  • C 40W
  • D 80
  • E 100W
View Answer & Explanation
Question 50:
The graph in the fig above describes the motion of a particle. the acceleration of the particle during the motion is
  • A 0.00ms<sup style='font-size: smaller;'>-2</sup>
  • B 0.25ms<sup style='font-size: smaller;'>-2</sup>
  • C 4.00ms<sup style='font-size: smaller;'>-2</sup>
  • D 8.00ms<sup style='font-size: smaller;'>-2</sup>
  • E 10.00ms<sup style='font-size: smaller;'>-2</sup>
View Answer & Explanation