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JEE PHYSICS MCQ: SYSTEM OF PARTICLES

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Which of the following statements are correct?

1) Centre of mass of body always coincides with the centre of gravity of the body.

2) Central 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.

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Correct option: B

(b) and (d)

Option B ((b) and (d)) is correct because the center of gravity is where the total gravitational torque is zero, and a mechanical advantage greater than one means a small effort can lift a large load.

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