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Tuesday, 18 August 2026
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Physics Past Questions and Answers

Topic: Structure of Matter and Kinetic Theory

Jamb Physics Questions - Structure of Matter and Kinetic Theory

Question 61:
4g of a radioactive material of half-life 10 days is spilled on a laboratory floor. How long would it take to disintegrate 3.5g of the material?
  • A 1\(\frac{1}{4}\) days
  • B 8\(\frac{1}{4}\) days
  • C 30 days
  • D 80 days
View Answer & Explanation
Question 62:
At constant pressure, the density of a fixed mass of gas is
  • A Constant with temperature
  • B Proportional to its volume
  • C Inversely proportional to its temperature
  • D Independent of its volume
View Answer & Explanation
Question 63:
A rocket burns fuel at the rate of 10kgs-1 and ejects it with velocity of 5 x 103ms-1. The thrust exerted by the gas on the rock is
  • A 2.5 x 10<sup style='font-size: smaller;'>7</sup>N
  • B 5.0 x 10<sup style='font-size: smaller;'>4</sup>N
  • C 5.0 x 10<sup style='font-size: smaller;'>2</sup>N
  • D 2.0 x 10<sup style='font-size: smaller;'>-3</sup>N
View Answer & Explanation
Question 64:
When the volume of a given mass of gas is halved and its temperature doubled, the pressure
  • A Remains constant
  • B Increases by a factor of 4
  • C Increases by a factor of 3
  • D Decreases by a factor of 4
View Answer & Explanation
Question 65:
200g of water at 90°C is mixed with 100g of water at 30°C. What is the final temperature?
  • A 50<sup style='font-size: smaller;'>o</sup>C
  • B 60<sup style='font-size: smaller;'>o</sup>C
  • C 70<sup style='font-size: smaller;'>o</sup>C
  • D 80<sup style='font-size: smaller;'>o</sup>C
View Answer & Explanation