Physics - Questions and Answers, General Study (GK)

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411.

An iron ball and a wooden wall of the same radius are released from the same height in a vacuum. The time taken by both of the these to reach the ground is

(a)Roughly equal

(b)Zero

(c)Exactly equal

(d)Unequal

Comment

Answer is: C

412.

A ball is dropped from height 5 m. The ball embedded in Sand 1 m and stops, then

(a)Only Momentum remains conserved

(b)Only kinetic energy remains conserved

(c)Both Momentum and kinetic energy are conserved

(d)Neither kinetic energy nor Momentum is conserved

Comment

Answer is: D

413.

A completely inelastic collision is one in which the two colliding particles

(a)Are separated after collision

(b)Remain together after collision

(c)Split into small fragments flying in all directions

(d)None of the above

Comment

Answer is: B

414.

In an elastic collision

(a)Momentum is conserved but energy is not

(b)Both Momentum and energy is conserved

(c)Energy is conserved but Momentum is not

(d)Neither Momentum nor energy is conserved

Comment

Answer is: B

415.

Which of the following is correct, when a person walks on a rough surface?

(a)The frictional force exerted by the surface keeps him moving

(b)The force which the man exert on the floor keeps him moving

(c)The reaction of the force which the man exerts on floor keeps him moving

(d)None of the above

Comment

Answer is: C

416.

When a bicycle is in motion by pedaling, the force of friction exerted by the ground on the two wheels in such that it apps

(a)In the backward direction on the front wheel and in the forward direction on the rear wheel

(b)In the forward direction on the front wheel and in the backward direction on the rear wheel

(c)In the backward direction on both front and rear wheels

(d)In the forward direction on both front and rear wheels

Comment

Answer is: A

417.

Consider a vehicle going on a horizontal Road towards east. Neglect any force by the air. The frictional force on the vehicle by the road

(a)Is zero if the vehicles is moving with a non uniform velocity

(b)Is towards east if the vehicle is accelerating

(c)Must be towards east

(d)Must be towards west

Comment

Answer is: C

418.

Consider the following statements<br />rn1. static force of friction is greater than Kinetic of sliding force of friction.<br />rn2. Rolling force of friction is less than Kinetic of sliding force of friction.<br />rnWhich of two statement given above is/are correct?

(a)Only 1

(b)Only 2

(c)Both 1 and 2

(d)Neither 1 nor 2

Comment

Answer is: C

419.

The orbital speed of Jupiter is

(a)Greater than the orbital speed of the earth

(b)Less than the orbit speed of the earth

(c)Zero

(d)Equal to the orbital speed of the earth

Comment

Answer is: A

420.

A geostationary satellite has an orbital period of

(a)2 hours

(b)8 hours

(d)16 hours

Comment

Answer is: C

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Physics - Questions and AnswersPage 42

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