Physics - Questions and Answers, General Study (GK)

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401.

One astronomical unit is the average distance between

(a)Earth and Moon

(b)Earth and Sun

(c)Jupiter and Sun

(d)Earth and Pluto

Comment

Answer is: B

402.

A ball P is dropped vertically and another ball Q is thrown horizontally with the same velocities from the same height and at the same time. if air resistance is neglected, then

(a)Ball p reaches the ground first

(b)Ball Q reaches the ground first

(c)Both reaches the ground at the same time

(d)The respective masses of the two balls will decide the time

Comment

Answer is: C

403.

For a moving body at any instant of time

(a)If the body is not moving, the acceleration is necessarily zero

(b)If the body is slowing, the retardation is negative

(c)If the body is slowing, the distance is negative

(d)If the displacement, velocity and acceleration at the instant are known, we can find the displacement at any given time in future

Comment

Answer is: D

404.

A body is imparted motion from rest to move in a straight line. If is is then obstructed by an opposite force, then

(a)The body may necessarily change direction

(b)The body is sure to slow down

(c)The body will necessarily continue to move in the same direction at the same speed

(d)None of the above

Comment

Answer is: B

405.

A person is sitting in a moving train and facing the engine. He tosses up a coin and coin falls behind him. it can be concluded that the train is

(a)Moving forward and gaining speed

(b)Moving forward and losing speed

(c)Moving forward and uniform speed

(d)Moving backward and uniform speed

Comment

Answer is: A

406.

A person sitting in an open car moving at constant velocity throws a ball vertically up into air. The ball falls

(a)Outside the car

(b)In the car ahead of the person

(c)In the car to the side of the person

(d)Exactly in the hand which threw it up

Comment

Answer is: D

407.

A person standing at the middle point of a wooden ladder which starts slipping between a vertical wall and the floor of a room, while continuing to remain in a vertical plane. The path traced by a person standing at the middle point of the slipping ladder is

(a)A straight line

(b)An elliptical line

(c)A circular path

(d)A parabolic path

Comment

Answer is: C

408.

A person sitting in a car which is at rest. The reaction from the road at the each of the four wheels of the car is R. When the car runs on a straight level road, how will the reaction at the either of the front wheels vary?

(a)It will be greater than R

(b)It will be less than R

(c)It will be equal to R

(d)It shall depend on the materials of the road

Comment

Answer is: C

409.

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: D

410.

When the external torque on a system is zero, there will be conservation of its

(a)Linear momentum

(b)Angular momentum

(c)Total energy

(d)None of the above

Comment

Answer is: B

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Physics - Questions and AnswersPage 41

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