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Physics Question on Centre of mass

Which of the following statements are correct?

  1. Centre of mass of a body always coincides with the centre of gravity of the body.
  2. Centre of mass of a body is the point at which the total gravitational torque on the body is zero.
  3. A couple on a body produce both translational and rotational motion in a body.
  4. Mechanical advantage greater than one means that small effort can be used to lift a large load.
A

(b) and (d)

B

(a) and (b)

C

(b) and (c)

D

(c) and (d)

Answer

(b) and (d)

Explanation

Solution

The correct option is (A): (b) and (d).