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Physics · PYQ NEET UG 2017
हिन्दीWhich of the following statements are correct? (A) Centre of mass of a body always coincides with the centre of gravity of the body. (B) Centre of mass of a body is the point at which the total gravitational torque on the body is zero. (C) A couple on a body produce both translational and rotational motion in a body. (D) Mechanical advantage greater than one means that small effort can be used to lift a large load.
Correct answer · Option 1
(B) and (D) only
Explanation
Centre of mass is the point where total gravitational torque is zero (B is correct). Mechanical advantage \( > 1 \) means small effort lifts a large load (D is correct). Statement A is false for non-uniform large bodies, and C is false because a couple produces pure rotation, not translation.
