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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 76:
The half-life of a radio-active element is 9 days, what fraction of atoms has decayed in 36 days?
  • A \( \frac{1}{16} \)
  • B \( \frac{1}{4} \)
  • C \( \frac{1}{2} \)
  • D \( \frac{15}{16} \)
View Answer & Explanation
Question 77:
Before starting a journey, the tyre pressure of a car was 3 x 105Nm-2 at 27oC. At the end of the journey, the pressure rose to 4 x 105Nm-2. Calculate the temperature of the tyre after the journey, assuming the volume is constant
  • A 400<sup style='font-size: smaller;'>o</sup>C
  • B 300<sup style='font-size: smaller;'>o</sup>C
  • C 273<sup style='font-size: smaller;'>o</sup>C
  • D 127<sup style='font-size: smaller;'>o</sup>C
View Answer & Explanation
Question 78:
What happens when a gas expands at constant temperature?
  • A Its pressure decreases
  • B The total momentum of its molecules remains constant
  • C Its pressure decreases and the total momentum of its moleculees remains constant
  • D Its pressure decreses and the total kinetic energy of its molecule decreases
View Answer & Explanation
Question 79:
The colours seen in the thin films of oil on the road and in soap bubbles are due to
  • A Reflection
  • B Interference
  • C Diffraction
  • D Polarization
View Answer & Explanation
Question 80:
A bullet fired at a wooden block of thickness 0.15m manages to penetrate the block. If the mass of the bullet is 0.025kg and the average resisting force of the wood is 7.5 x 103N, calculate the speed of the bullet just before it hits the wooden block.
  • A 450ms<sup style='font-size: smaller;'>-1</sup>
  • B 400ms<sup style='font-size: smaller;'>-1</sup>
  • C 300ms<sup style='font-size: smaller;'>-1</sup>
  • D 250ms<sup style='font-size: smaller;'>-1</sup>
View Answer & Explanation