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Sunday, 21 June 2026
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Physics Past Questions and Answers

Topic: using the theory to explain:

Jamb Physics Questions - using the theory to explain:

Question 11:
Which of the following statements is (are) NOT correct? i. pressure changes do not affect the speed of sound in air ii. the velocity of sound increases with temperature iii. the quality of the note depends only on its frequency
  • A I only
  • B Ii only
  • C Iii only
  • D I and iii
  • E Ii and iii
View Answer & Explanation
Question 12:
A given mass of an ideal gas occupies a volume V at a temperature T and under a pressure p. If the pressure is increased to 2p and the temperature reduced to \(\frac{1}{2T}\), then the percentage change in the volume of the gas is
  • A 0%
  • B 25%
  • C 75%
  • D 300%
  • E 400%
View Answer & Explanation
Question 13:
The electromotive force obtained from a simple dynamo may be increased by
  • A Increasing the cross-sectional area of the coil
  • B Winding the coil on a soft-iron armature so as to decrease the magnetic flux through the coil
  • C Increasing the speed of rotation
  • D Making the field magnet longer
  • E Using low-resistance copper coils
View Answer & Explanation
Question 14:
A 0.05kg bullet travelling at 500ms-1 horizontally strikes a thick vertical wall. It stops after penetrating through the wall horizontal distance of 0.25m. What is the magnitude of the average force the wall exerts on the bullet?
  • A 25N
  • B 50N
  • C 250N
  • D 500N
  • E 25 000N
View Answer & Explanation
Question 15:
A quantity of gas occupies a certain volume when the temperature is -73oC and the pressure is 1.5 atmospheres. If the pressure is increased to 4.5 atmospheres and the volume is halved at the same time, what will be the new temperature of the gas?
  • A 573<sup style='font-size: smaller;'>o</sup>C
  • B 327<sup style='font-size: smaller;'>o</sup>C
  • C 300<sup style='font-size: smaller;'>o</sup>C
  • D 110<sup style='font-size: smaller;'>o</sup>C
  • E 27<sup style='font-size: smaller;'>o</sup>C
View Answer & Explanation