Physics - Questions and Answers, General Study (GK)

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51.

Consider the following statements
1. When a coolie carrying a load on his head moves on a horizontal platform, the work done by the coolie against gravity is zero.
2. When a satellite revolves in a circular orbit around the earth, the work done by the gravitational force on the satellite is zero.
3. When a body falls freely under gravity, the work done by gravity is negative.
4. Work is a scalar quantity.
Which of the statement(s) given above is/are correct?

(a)1 and 2

(b)2 and 3

(c)only 4

(d)1, 2 and 4

Comment

Answer is: ANA

52.

A bullet is fired from a rifle. If the rifle recoils freely, the kinetic energy of the rifle in comparison to that of the bullet is

(a)greater

(b)equal

(c)less

(d)Nothing can be said

Comment

Answer is: CNA

53.

If a light body and a heavy body have equal momentum, then

(a)the lighter body has greater kinetic energy than the heavier body

(b)the lighter body has lesser kinetic energy than the heavier body

(c)the kinetic energy of the lighter body is equal to the kinetic energy of the heavier body

(d)the kinetic energy of both the bodies are independent of momentum

Comment

Answer is: ANA

54.

The kinetic energy of a particle continuously increase with time,

(a)the resultant force on the particle must be parallel to the velocity at all instants

(b)the resultant force on the particle must be at an angle greater than 90°

(c)the magnitude of its linear momentum is increasing continuously

(d)its height above the ground level must continuously decrease

Comment

Answer is: DNA

55.

A metal ball and a rubber ball of the same mass are dropped from the same height. After hitting the floor, the rubber ball rises higher than the metal ball, why?

(a)Momentum is not conserved when the metallic ball hits the floor

(b)The rubber ball hits the floor with greater velocity

(c)Momentum is not conserved when rubber ball hits the floor

(d)None of the above

Comment

Answer is: DNA

56.

When two bodies stick together after the collision, then the collision is said to be

(a)Partially elastic

(b)Perfectly elastic

(c)Completely inelastic

(d)None of the above

Comment

Answer is: CNA

57.

A bullet hits and gets embedded in a solid block resting on a horizontal friction-less table. What is conserved?

(a)Momentum

(b)Momentum and KE

(c)KE

(d)Neither momentum nor KE

Comment

Answer is: DNA

58.

Which of the following is most elastic?

(a)Rubber

(b)Wet clay

(c)Steel

(d)Plastic

Comment

Answer is: CNA

59.

When the velocity of a body is doubled,

(a)its KE is doubled

(b)its PE us doubled

(c)its momentum is doubled

(d)its acceleration is doubled

Comment

Answer is: CNA

60.

If a bomb dropped from an airplane explodes in mid-air

(a)its KE increase

(b)its total energy increases

(c)its total energy decreases

(d)None of the above

Comment

Answer is: CNA

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Physics - Questions and AnswersPage 6

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