KVPY Stream-SA (Class 11) Physics: Questions 72 - 74 of 252

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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.

Equation

b.

Equation

c.

Equation

d.

Equation

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.

Equation

b.

Equation

c.

Equation

d.

Equation

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.

Equation

b.

Equation

c.

Equation

d.

Equation

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