Welcome to the Science Quiz 58

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Welcome to the Science Quiz 19 — Science Quiz 58

This is a timed quiz. You will be given 15 seconds per question. Are you ready?

The centre of mass of a body:

Lies within or outside the body

Lies always outside the body

Lies always inside the body

None

Correct! Wrong!

A body is hanging from a rigid support by an inextensible string of length ‘l’ . It is struck inelastically by an identical body of mass m with horizontal velocity v = √(2gL) , the tension in the string increases just after the striking by ?

2 mg

1 mg

3 mg

None

Correct! Wrong!

If a ball is thrown upwards from the surface of earth:

The ball and earth both move away from each other

The ball and earth both moves towards each other

The ball remains stationary while the earth moves downwards

None

Correct! Wrong!

If the KE of a body becomes four times of its initial value, then the new momentum will be more than its initial momentum by?

125%

50%

200%

100%

Correct! Wrong!

Fast neutrons can easily be slow down by

Passing them through heavy water

Elastic collision with heavy nucleus

The use of lead shield

None

Correct! Wrong!

A bomb travelling in a parabolic path under the effect of gravity, explodes in mid air. The centre of mass of fragments will:

Move vertically downwards

Move in irregular path

Move in the parabolic path the unexploded bomb would have traveled

None

Correct! Wrong!

A massive ball moving with speed v collides with a tiny ball having a mass very much smaller than the mass of the first ball. If the collision is elastic, then immediately after the impact, the second ball will move with a speed approximately equal to:

v/2

None

Correct! Wrong!

A bullet in motion hits and gets embedded in a solid block resting on a frictionless table. What is conserved?

Momentum and KE

Momentum alone

Kinetic energy alone

None of these

Correct! Wrong!

Science Quiz 58

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Welcome to the Science Quiz 58

The centre of mass of a body:

A body is hanging from a rigid support by an inextensible string of length ‘l’ . It is struck inelastically by an identical body of mass m with horizontal velocity v = √(2gL) , the tension in the string increases just after the striking by ?

If a ball is thrown upwards from the surface of earth:

If the KE of a body becomes four times of its initial value, then the new momentum will be more than its initial momentum by?

Fast neutrons can easily be slow down by

A bomb travelling in a parabolic path under the effect of gravity, explodes in mid air. The centre of mass of fragments will:

A massive ball moving with speed v collides with a tiny ball having a mass very much smaller than the mass of the first ball. If the collision is elastic, then immediately after the impact, the second ball will move with a speed approximately equal to:

A bullet in motion hits and gets embedded in a solid block resting on a frictionless table. What is conserved?

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