Exams › NEET › Physics

Which 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

1. (A) and (B)
2. (B) and (C)
3. (C) and (D)
4. (B) and (D)

Correct answer: (B) and (D)

Solution

Statement (B) is correct because the center of mass is the point where the total gravitational torque is zero. Statement (D) is also correct because a mechanical advantage greater than one implies that a smaller effort can lift a larger load. Statements (A) and (C) are incorrect as the center of mass does not always coincide with the center of gravity, and a couple only produces rotational motion, not translational motion.

Related NEET Physics questions

• A uniform rod is resting freely over a smooth horizontal plane. A particle moving horizontally strikes at one end of the rod normally and gets stuck. Then This question has multiple correct options
• The dimensional formula of torque is
• The moment of the force, \( \mathbf{F} = 4\mathbf{i} + 5\mathbf{j} - 6\mathbf{k} \) at \((2, 0, -3)\), about the point \((2, -2, -2)\), is given by
• An object flying in air with velocity (20i + 25j − 12k) suddenly breaks into two pieces whose masses are in the ratio 1 : 5. The smaller mass flies off with a velocity (100i + 35j + 8k). The velocity of the larger piece will be
• At maximum compression, the solid cylinder will stop so loss in kinetic energy of the cylinder equals gain in potential energy of the spring. What is the expression for the energy?
• Two persons of masses 55 kg and 65 kg respectively, are at the opposite ends of a boat. The length of the boat is 3.0 m and weighs 100 kg. The 55 kg man walks up to the 65 kg man and sits with him. If the boat is in still water the centre of mass of the system shifts by:

⚔️ Practice NEET Physics free + battle 1v1 →