KVPY Government Jobs Exams

A plane polarized light passed through successive polarizers which are rotated by 30º with respect to each
other in the clockwise direction. Neglecting absorption by the polarizers and given that the first polarizer's
axis is parallel to the plane of polarization of the incident light, the intensity of light at the exit of the fifth
polarizer is closest to -
(A) same as that of the incident light (B) 17.5% of the incident light
(C) 30% of the incident light (D) zero

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KVPY Other Question

A speaker emits a sound wave of frequency f0. When it moves towards a stationary observer with speed u,
the observer measures a frequency f1. If the speaker is stationary, and the observer moves towards it with
speed u, the measured frequency is f2. Then -
(A) f1 = f2 < f0 (B) f1 > f2 (C) f1 < f2 (D) f1 = f2 > f0
At 23ºC, a pipe open at both ends resonates at a frequency of 450 hertz. At what frequency does the same
pipe resonate on a hot day when the speed of sound is 4 percent higher than it would be at 23ºC ?
(A) 446 Hz (B) 454 Hz (C) 468 Hz (D) 459 Hz