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Sunday, 14 June 2026
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Physics Past Questions and Answers

Jamb 2012 Physics Questions

Question 41:
The velocity ratio of a machine is 5 and its efficiency is 75%. What effort would be needed to lift a load of 150N with the machine?
  • A 20N
  • B 30N
  • C 40N
  • D 50N
View Answer & Explanation
Question 42:
At a fixed point below a liquid surface, the pressure downwards is P1 and pressure upwards is P2. It can be deduced that
  • A P<sub style='font-size: smaller;'>1</sub> > P<sub style='font-size: smaller;'>2</sub>
  • B P<sub style='font-size: smaller;'>1</sub> ≥ P<sub style='font-size: smaller;'>2</sub>
  • C P<sub style='font-size: smaller;'>1</sub> < P<sub style='font-size: smaller;'>2</sub>
  • D P<sub style='font-size: smaller;'>1</sub> = P<sub style='font-size: smaller;'>2</sub>
View Answer & Explanation
Question 43:
If the force and the velocity on a system are each reduced simultaneously by half, the power of the system is
  • A Doubled
  • B Reduced to a quarter
  • C Reduced by half
  • D Constant
View Answer & Explanation
Question 44:
A catapult used to hold a stone of mass 500g is extended by 20cm with an applied force F. If the stone leaves with a velocity of 40m/s, the value of F is
  • A 4.0 x 10<sup style='font-size: smaller;'>2</sup>N
  • B 2.0 x 10<sup style='font-size: smaller;'>3</sup>N
  • C 4.0 x 10<sup style='font-size: smaller;'>3</sup>N
  • D 4.0 x 10<sup style='font-size: smaller;'>4</sup>N
View Answer & Explanation
Question 45:
A stream is flowing at 0.75ms\(^{-1}\) and a boat heading perpendicular for the stream landed at the opposite bank at an angle of 30°. Calculate the velocity of the boat.
  • A 1.50ms<sup style='font-size: smaller;'>-1</sup>
  • B 1.00ms<sup style='font-size: smaller;'>-1</sup>
  • C 0.86ms<sup style='font-size: smaller;'>-1</sup>
  • D 0.65ms<sup style='font-size: smaller;'>-1</sup>
View Answer & Explanation