IIT-JEE Exam

STATEMENT-1
If there is no external torque on a body about its center of mass, then the velocity of the center of mass remains
constant.
because
STATEMENT-2
The linear momentum of an isolated system remains constant.
(A) Statement -1 is True, Statement-2 is True; Statement -2 is a correct explanation for Statement-1.
(B) Statement -1 is True, Statement-2 is True; Statement -2 is NOT a correct explanation for Statement-1.
(C) Statement -1 is True, Statement-2 is False.
(D) Statement -1 is False, Statement-2 is True

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IIT-JEE Other Question
STATEMENT-1
A vertical iron rod has a coil of wire wound over it at the bottom end.
An alternating current flows in the coil. The rod goes through a
conducting ring as shown in the figure. The ring can float at a certain
height above the coil.
Because
STATEMENT-2
In the above situation, a current is induced in the ring which interacts with the horizontal component of the magnetic
field to produce an average force in the upward direction.
(A) Statement -1 is True, Statement-2 is True; Statement -2 is a correct explanation for Statement-1.
(B) Statement -1 is True, Statement-2 is True; Statement -2 is NOT a correct explanation for Statement-1.
(C) Statement -1 is True, Statement-2 is False.
(D) Statement -1 is False, Statement-2 is True. STATEMENT-1
The total translational kinetic energy of all the molecules of a given mass of an ideal gas is 1.5 times the product of its
pressure and its volume.
because
STATEMENT-2
The molecules of a gas collide with each other and the velocities of the molecules change due to the collision.
(A) Statement -1 is True, Statement-2 is True; Statement -2 is a correct explanation for Statement-1.
(B) Statement -1 is True, Statement-2 is True; Statement -2 is NOT a correct explanation for Statement-1.
(C) Statement -1 is True, Statement-2 is False.
(D) Statement -1 is False, Statement-2 is True