KVPY Stream SB-SX (Class 12 & 1st Year BSC) Physics: Questions 242 - 244 of 250

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Question number: 242

» Dual Nature of Matter and Radiation » Photoelectric Effect

MCQ▾

Question

When ultraviolet radiation of a certain frequency falls on a potassium target, the photoelectrons released can be stopped completely by a retarding potential of 0.9 V. If the frequency of the radiation is increased by 15%, this stopping potential rises to 1.2 V. The work function of potassium is –

Choices

Choice (4) Response

a.

2.0 eV

b.

1.5 eV

c.

2.8 eV

d.

1.1 eV

Question number: 243

» Thermodynamics » Concept of Temperature

MCQ▾

Question

A sound wave passing through air at NTP produces a pressure of 0.002dyne/cm2 during a compression. The corresponding change in temperature (given γ = 1.5 and assume gas to be ideal) is –

Choices

Choice (4) Response

a.

1.93×107K

b.

1.93×106K

c.

1.93×108K

d.

All of the above

Question number: 244

» Kinematics » Uniform and Non-Uniform Motion

Appeared in Year: 2013

MCQ▾

Question

A block of mass m slides from rest at a height H on a frictionless inclined plane as shown in the figure. It travels a distance d across a rough horizontal surface with coefficient of kinetic friction µ, and compresses a spring of spring k by a distance x before coming to rest momentarily. Then the spring extends and the block travels back attaining a final height of h. Then –

A block of mass m slides from frictionless inclined plane

A Block of Mass M Slides From Frictionless Inclined Plane

In figure a block of mass m slides from rest at height H on a frictionless inclined plane. It also travels a distance d across a rough horizontal surface, and compresses a sprig.

Choices

Choice (4) Response

a.

h=H+2μ(d+x)

b.

h=H2μ(d+x)+kx22mg

c.

h=H2μ(d+x)

d.

h=H2μd+kx2mg

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