KVPY Government Jobs Exams

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

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KVPY Other Question

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 In a Young's double slit set-up, light from a laser source falls on a pair of very narrow slits separated by 1.0
micrometer and bright fringes separated by 1.0 millimeter are observed on a distant screen. If the frequency
of the laser light is doubled, what will be the separation of the bright fringes ?
(A) 0.25 mm (B) 0.5 mm (C) 1.0 mm (D) 2.0 mm