KVPY Stream SB-SX (Class 12 & 1st Year BSC) Physics: Questions 63 - 65 of 250

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Question number: 63

» Thermodynamics » Concept of Temperature

Appeared in Year: 2012

MCQ▾

Question

Two identical bodies are made of a material for which the heat capacity increases with temperature. One of these is held at a temperature of 1000C while the other one is kept at 00 C. If the two are brought into contact, then, assuming no heat loss to the environment, the final temperature that they will reach is,

Choices

Choice (4) Response

a.

less than 500C

b.

00C

c.

more than 500C

d.

500C

Question number: 64

» Gravitation » Orbital Velocity of a Satellite

Appeared in Year: 2012

MCQ▾

Question

A small asteroid is orbiting around the sun in a circular orbit of radius r0 with speed V0. A rocket is launched from the asteroid with speed V = αV0, where V0 is the speed relative to the sun. The highest value of α for which the rocket will remain bound to the solar system is (ignoring gravity due to the asteroid and effects of other planets) –

Choices

Choice (4) Response

a.

3

b.

2

c.

1

d.

2

Question number: 65

» Physics and Measurement » Dimensional Analysis and Its Applications

Appeared in Year: 2012

MCQ▾

Question

A liquid drop placed on a horizontal plane has a near spherical shape (slightly flattened due to gravity). Let R be the radius of its largest horizontal section. A small disturbance causes the drop to vibrate with frequency ν about its equilibrium shape. By dimensional analysis the ratio νσρR3 can be (here σ is surface tension, ρ is density, g is acceleration due to gravity, and k is an arbitrary dimensionless constant)

Choices

Choice (4) Response

a.

K=ρgσ

b.

K=ρR3gσ

c.

K=ρgR2σ

d.

K=ρR2gσ

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