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State PCS PYQPrelims 2025

BPSC – Combined Competitive Examination · Question 125

The potential energy of a freely falling body continuously decreases. Therefore:

  1. The principle of conservation of energy is violated
  2. The principle of conservation of energy is not violated
  3. Gravitational force is violated
  4. Gravitational force is not violated
Show answer & explanation

Answer: (B) The principle of conservation of energy is not violated

Explanation

As the body falls, potential energy converts to kinetic energy; total mechanical energy is conserved.

  • (A) Incorrect

    Wrong: lost potential energy becomes kinetic energy, so energy is conserved.

  • (B) Correct

    Correct: PE + KE stays constant (ignoring air resistance).

  • (C) Incorrect

    Wrong: meaningless; gravity is what causes the fall.

  • (D) Incorrect

    Wrong: irrelevant to the energy question asked.