KVPY (Kishore Vaigyanik Protsahan Yojana) Stream SB-SX (Class 12 & 1st Year B.Sc.) Physics: Questions 225 - 227 of 268

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Question number: 225

» Oscillations and Waves » Simple Pendulum

Appeared in Year: 2015

MCQ▾

Question

A simple pendulum of length l is made to oscillate with amplitude of 45 degrees. The acceleration due to gravity is g. LetEquation . The time period of oscillation of this pendulum will be

Choices

Choice (4) Response

a.

Slightly more than T0.

b.

Slightly less than T0.

c.

T0 irrespective of the amplitude.

d.

Dependent on whether it swings in a plane aligned with the north – south or east – west directions.

Question number: 226

» Ray Optics » Snell's Law

Appeared in Year: 2014

MCQ▾

Question

The angles of incidence and refraction of a monochromatic ray of light of wavelength λ at an air-glass interface are i and r, respectively. A parallel beam of light with a small spread δλ in wavelength about a mean wavelength λ is refracted at the same air-glass interface. The refractive index µ of glass depends on the wavelength λ as Equation where a and b are constants. Then the angular spread in the angle of refraction of the beam is –

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

Question number: 227

» Electromagnetic Induction & Alternating Currents » Electromagnetic Induction

MCQ▾

Question

A long vertical wire carrying current i produces a neutral point with the earth’s magnetic field at 7 cm from the wire. If the horizontal component of the earth’s magnetic field is 0.18 gauss, the current in the wire is –

Choices

Choice (4) Response

a.

12.6 A

b.

63 A

c.

6.3 A

d.

0.63 A

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