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Sunday, 16 August 2026
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Physics Past Questions and Answers

Topic: Concept of beam balance

Jamb Physics Questions - Concept of beam balance

Question 11:
In the fig above,A lever of length 200m is used to lift a load of mass 180kg. The pivot at P is 20m from the load. what minimum force F must be applied at the end of the lever [g = 10ms-2]
  • A 9N
  • B 18N
  • C 20N
  • D 200N
View Answer & Explanation
Question 12:
Two similar kettles containing equal masses of boiling water are placed on a table. If the surface of one is highly polished and the surface of the other is covered with soot, Which of the following observations is correct
  • A The two kettles will cool down at the same rate
  • B The polished kettle cools down more quickly by conduction
  • C The kettle covered with soot cools down more quickly because it is a good radiator
  • D The kettle covered with soot cools down more quickly by the process of heat convection
View Answer & Explanation
Question 13:
A uniform rod PQ of length 1m and mass 2kg is pivoted at the end p. If load of 14N is placed at the center of the rod, find the force that should be applied vertically upwards at Q to maintain the rod at equilibrium horizontally [g = 10ms-2]
  • A 68N
  • B 28N
  • C 17N
  • D 7N
View Answer & Explanation
Question 14:
The figure above represents a frictionless pulley system in which a weight W is in equilibrium with a weight of 40N. Find the value of W
  • A 13.3N
  • B 20.0N
  • C 40.0N
  • D 80.0N
View Answer & Explanation
Question 15:
the ratio of electrostatic force FE to gravitational force FG between two protons each of charge e and mass m, at a distance d is
  • A E/4πԐoGm
  • B E<sup style='font-size: smaller;'>2</sup>/Gm<sup style='font-size: smaller;'>2</sup>
  • C Gm<sup style='font-size: smaller;'>2</sup>/4πԐoe<sup style='font-size: smaller;'>2</sup>
  • D E<sup style='font-size: smaller;'>2</sup>/4πԐoeGm<sup style='font-size: smaller;'>2</sup>
View Answer & Explanation