KVPY Stream-SA (Class 11) Physics: Questions 72 - 74 of 242

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Question number: 72

» Ray Optics » Deviation and Dispersion of Light by a Prism

Appeared in Year: 2013

MCQ▾

Question

The refractive index of a prism measured using three lines of a mercury vapour lamp. If μ1, μ2 and μ3 are the measured refractive indices for these green, blue and yellow lines respectively, then

Choices

Choice (4) Response

a.

μ2>μ3>μ1

b.

μ3>μ2>μ1

c.

μ2>μ1>μ3

d.

μ1>μ2>μ3

Question number: 73

» Laws of Motion » Static and Kinetic Friction

Appeared in Year: 2012

MCQ▾

Question

A block of mass m is sliding down an inclined plane with constant speed. At a certain instant t0, its height above the ground is h. The coefficient of kinetic friction between the block and the plane is μ. If the block reaches the ground at a later instant tg, then the energy dissipated by friction in the time interval (tg - t0) is:

A block sliding down an inclined plane

A Block Sliding Down an Inclined Plane

Figure shows a block of mass m is sliding down an inclined plane with constant speed.

Choices

Choice (4) Response

a.

mgh

b.

mgh

c.

μmghcosθ

d.

μmghsinθ

Question number: 74

» Dual Nature of Matter and Radiation » Einstein's Photoelectric Equation

Appeared in Year: 2013

MCQ▾

Question

Solar energy is incident normally on the earth’s surface at the rate of about 1.4 kW m-2. The distance between the earth and the sun is 1.5 × 1011 m. Energy (E) and mass (m) are related by Einstein equation E = mc2 where c (3 × 108ms-1) is the speed of light in free space. The decrease in the mass of the sun is

Choices

Choice (4) Response

a.

109kgs

b.

1011kgs

c.

1030kgs

d.

1026kgs

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