NEET Physics MCQs

Which of the following statements regarding the center of mass and gravity are true?

(1) The center of mass always coincides with the center of gravity.

(2) The center of mass is where the total gravitational torque is zero.

(3) The center of gravity is the point where the weight of the body acts.

A body is in equilibrium under the influence of gravity. Which of the following is true about its center of gravity?

The weight of the body at the centre of the earth is

A car sometimes overturns while taking a turn. When it overturns, it is

A boy and a man carry a uniform rod of length L, horizontally in such a way that boy gets 1/4 th load. If the boy is at one end of the rod, the distance of the man from the other end is

A boy and a man carry a uniform rod of length L, horizontally in such a way that boy gets 1/4 th load. If the boy is at one end of the rod, the distance of the man from the other end is

A rectangular block has a square base measuring a×a, and its height is $h$. Its moves on a horizontal surface in a direction perpendicular to one of its edges. The coefficient of friction is $\mu$. It will topple if

A uniform rod of density $\rho$  is placed in a wide tank containing a liquid \sigma (\sigma > \rho ). The depth of liquid in the tank is half the length of the rod. The rod is in equilibrium, with its lower end resting on the bottom of the tank. In this position, the rod makes an angle θ with the horizontal. Then $\sin {\rm{heta }}$ is equal to

A hollow cylinder of mass $m$ made heavy at its bottom is floating vertically in water. It is tilled from its vertical position through an angle $heta$ and is left. The restoring force acting on it is

Two point objects of masses 1.5 g and 2.5 g respectively are at a distance of 16 cm apart, the centre of gravity is at a distance from the object of mass 1.5 g where $x$ is