A. Centre of mass of a body always coincides with the centre of gravity of the body
B. Centre of gravity 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
(2017-Delhi)
Solution:
Centre of gravity is the point where total gravitational torque is zero (Statement B is correct). Mechanical advantage greater than one implies a small effort lifts a large load (Statement D is correct). Thus, statements B and D are correct, making option (d) the right choice.
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