IIT-JEE Exam

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.

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IIT-JEE Other Question
In the experiment to determine the speed of sound using a resonance column,
(A) prongs of the tuning fork are kept in a vertical plane
(B) prongs of the tuning fork are kept in a horizontal plane
(C) in one of the two resonances observed, the length of the resonating air column is close to the wavelength of sound
in air
(D) in one of the two resonances observed, the length of the resonating air column is close to half of the wavelength of
sound in air 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