Physics - Questions and Answers, General Study (GK)

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41.

A body is moving in a circular path with a constant speed. It has

(a)a constant velocity

(b)a constant acceleration

(c)an acceleration of constant magnitude

(d)an acceleration which varies with time

Comment

Answer is: CNA

42.

A ball is thrown upwards and it returns to ground describing a parabolic path. Which of the following remains constant?

(a)Kinetic energy of the ball

(b)Speed of the ball

(c)Horizontal component of velocity

(d)Vertical component of velocity

Comment

Answer is: CNA

43.

A jet plane flies in the air because

(a)the gravity does not act on bodies moving with high speeds

(b)the thrust of the jet compensates for the force of gravity

(c)the flow of air around the wings causes an upward force, which compensates for the force of gravity

(d)the weight of air whose volume is equal to the volume of the plane is more than the weight of the plane

Comment

Answer is: BNA

44.

The force required to keep a body in uniform circular motion is

(a)centripetal force

(b)centrifugal force

(c)resistance

(d)none of the above

Comment

Answer is: ANA

45.

An athlete diving off high spring board can perform a variety of exercise in the air before entering the water body. Which one of the following parameter will remain constant during the fall?

(a)The athlete's linear momentum

(b)The athlete's angular momentum

(c)The athlete's kinetic energy

(d)The athlete's moment of inertia

Comment

Answer is: BNA

46.

A cricket player catches a fast coming ball by pulling his hands back because

(a)the ball can come to a position of rest

(b)the ball can exert a greater force

(c)the ball can be accelerated

(d)the ball can exert a lesser force

Comment

Answer is: BNA

47.

Rocket operates (works) on the principle of

(a)energy conservation

(b)Bernoulli's theorem

(c)Avogadro's concept

(d)momentum conservation

Comment

Answer is: DNA

48.

A passenger in a moving train tosses a five rupees coin. If the coin falls behind him, then the train must be moving with a uniform

(a)acceleration

(b)deceleration

(c)speed

(d)velocity

Comment

Answer is: ANA

49.

The cat survives fall from height much more than human or any other animal. It is because the cat

(a)has elastic bones

(b)has thick and elastic skin

(c)can immediately adjust itself to land on all four paws and absorbs the impact of fall by bending

(d)None of the above

Comment

Answer is: CNA

50.

For a body moving with constant speed in a horizontal circle, which of the following remains constant?

(a)Velocity

(b)Acceleration

(c)Centripetal force

(d)KE

Comment

Answer is: DNA

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Physics - Questions and AnswersPage 5

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