Multiple choice

The principle involved in the working of the physical balance is

  1. Law of conservation of energy

  2. Law of conservation of linear momentum

  3. Law of conservation of angular momentum

  4. Principle of moments
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D Correct answer
Explanation

A physical balance works on the principle of moments (torque equilibrium). When the balance is level, the clockwise moment equals the anticlockwise moment. The product of mass and distance from the fulcrum must be equal on both sides for equilibrium to be achieved, which is the fundamental principle behind weighing scales.

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