IIT-JEE Exam

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

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IIT-JEE Other Question
A student performs an experiment to determine the Young’s modulus of a wire, exactly 2 m long, by Searle’s method.
In a particular reading, the student measures the extension in the length of the wire to be 0.8 mm with an uncertainty of
±0.05 mm at a load of exactly 1.0 kg. The student also measures the diameter of the wire to be 0.4 mm with an
uncertainty of ±0.01 mm. Take g = 9.8 m/s2 (exact). The Young’s modulus obtained from the reading is 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.