KVPY Stream SB-SX (Class 12 & 1st Year BSC) Physics: Questions 20 - 22 of 250

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Question number: 20

» Kinematics » Uniform and Non-Uniform Motion

Appeared in Year: 2010

MCQ▾

Question

A ball is dropped vertically from a height of h onto a hard surface. If the ball rebounds from the surface with a fraction r of the speed with which it strikes the latter on each impact, what is the net distance traveled by the ball up to the 10th impact?

Choices

Choice (4) Response
a.

h1r201r2

b.

2h1r221r2h

c.

2h(1r10)1r

d.

2h1r201r2h

Question number: 21

» Thermodynamics » Measurement of Temperature

Appeared in Year: 2011

MCQ▾

Question

Two rods, one made of copper and the other steel of the same length and cross sectional area are joined together. (The thermal conductivity of copper is 385 J s–1 m –1 K-1 and steel is 50 J s–1 m –1K–1) If the copper end is held at 1000C and the steel end is held at 00C, what is the junction temperature (assuming no other heat losses)?

Choices

Choice (4) Response
a.

880C

b.

120C

c.

500C

d.

730C

Question number: 22

» Gravitation » Universal Law of Gravitation

Appeared in Year: 2010

MCQ▾

Question

A certain planet completes one rotation about its axis in time T. The weight of an object placed at the equator on the planet’s surface is a fraction f (f is close to unity) of its weight recorded at a latitude of 600. The density of the planet assumed to be a uniform perfect sphere is given by –

Choices

Choice (4) Response
a.

4f1+f3π4GT2

b.

43f1f3π4GT2

c.

4f1f3π4GT2

d.

42f1f3π4GT2

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