NEET UG Physics Rational Motion MCQs

ASSERTION - REASONING TYPE

92. In the following questions statement - 1 (Assertion) is followed by statement - 2 (Reason). Each question has the following four choices out of which only one choice is correct.
{A} Statement - 1 is correct (true), Statement - 2 is true and Statement- 2 is correct explanation for Statement - 1
{B} Statement -1 is true, statement -2 is true but statement-2 is not the correct explanation four statement -1.
{C} Statement - 1 is true, statement-2 is false
{D} Statement-2 is false, statement -2 is true

93. Statement -1 — The angular momentum of a particle moving in a circular orbit with a constant speed remains conserved about any point on the circumference of the circle.      Statement -2— If no net torque outs, the angular momentum of a system is conserved.

94. Statement -1— A sphere and a cylinder slide without rolling from rest from the top of an inclined plane. They will reach the bottom with the same speed.
      Statement -2 — Bodies of all shapes, masses and sides slide down a plane with the same acceleration.

95. Statement -1— Friction is necessary for a body to roll on surface
      Statement -2— Friction provides the necessary tangential force and torque.

96. Statement -1— A body tied to a string is moved in a circle with a uniform speed. If the string suddenly breaks the angular momentum of the body becomes zero.
      Statement -2 — The torque on the body equals to the rate of change of angular momentum.

97. Statement -1 — If there is no external torque on a body about its centre of mass, then the velocity of the centre of mass remains constant.
      Statement -2 — The Linear momentum of an isolated system remains constant.

98. Statement -1 —Two cylinder one hollow and other solid (wood) with the same mass and identical dimensions are simultaneously allowed to roll without slipping down an inclined plane from the same height. The hollow will reach the bottom of inclined plane first.
Statement -2 — By the principle of conservation of energy, the total kinetic energies of both the cylinders are identical when they reach the bottom of the incline.

99. Statement -1 —A thin uniform rod AB of mass M and length L is hinged at one end A to the horizontal floor initially it stands vertically. It is allowed to fall freely on the floor in the vertical plane, The angular velocity of the rod when its ends B strikes the floor 

^√3g/_L

Statement -2 — The angular momentum of the rod about the hinge remains constant through out its fall to the floor.

100 .  Statement -1 —If the cylinder rolling with angular speed- w. suddenly breaks up in to two equal halves of the same radius. The angular speed of each piece becomes 2w.
          Statement -2—If no external torque outs, the angular momentum of the system is conserved.