Laws of Motion Test

Result

Laws of Motion Test - 47

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Question 1
4 / -1

A body of mass 2 kg is moving on the ground comes to rest after some time. The coefficient of kinetic friction between the body and the ground is 0.2. The retardation in the body is

A
9.8 m/s²

B
4.73 m/s²

C
2.16 m/s²

D
1.96 m/s²

Solution

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Question 2
4 / -1

A block of mass m is in contact with the cart C as shown in the figure.The coefficient of static friction between the block and the cart is µ. The acceleration α of the cart that will prevent the block from falling satisfies

A

B

C

D

Solution

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Question 3
4 / -1

A boy presses a book against the front wall such that the book does not move. The force of friction between the wall and the book is

A
Towards right

B
Towards left

C
Downwards

D
Upwards

Solution

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Question 4
4 / -1

A horse rider falls back when horse starts runningsuddenly because

A
Rider is taken back

B
Rider is suddenly afraid of falling

C
Inertia of rest keeps the upper part of body at rest whereas lower part of the body moves forward with the horse

D
None of the above
Question 5
4 / -1

When a train stops suddenly, passengers in the running train feel an instant jerk in the forward direction because

A
The back of seat suddenly pushes the passengers forward

B
Inertia of rest stops the train and takes the body forward

C
Upper part of the body continues to be in the state of motion whereas the lower part of the body in contact with seat remains at rest

D
Nothing can be said due to insufficient data
Question 6
4 / -1

A man getting down a running bus falls forwardbecause

A
Due to inertia of rest, road is left behind and man reaches forward

B
Due to inertia of motion upper part of body continues to be in motion in forward direction while feet come to rest as soon as they touch the road

C
He leans forward as a matter of habit

D
Of the combined effect of all the three factors stated in (a), (b) and (c)
Question 7
4 / -1

A boy sitting on the topmost berth in a compartment of a train which is just going to stop on a railway station, drops an apple aiming at the open hand of his brother sitting vertically below his hands at a distance of about 2 m. The apple will fall

A
Precisely on the hand of his brother

B
Slightly away from the hand of his brother in the direction of motion of the train

C
Slightly away from the hand of his brother in the direction opposite to the direction of motion of the train

D
None of the above
Question 8
4 / -1

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

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
Question 9
4 / -1

A small block of mass of 0.1 kg lies on a fixed inclined plane PQ which makes an angle θ with the horizontal. A horizontal force of 1 N acts on the block through its centre of mass as shown in the figure. The block remains stationary if (take g = 10 m/s²)

A
θ = 45°

B
θ> 45° and a frictional force acts on the block towards P

C
θ > 45° and a frictional force acts on the block towards Q

D
θ < 45° and a frictional force acts on the block towards Q

Solution

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Question 10
4 / -1

A small block is connected to one end of a massless spring of un-stretched length 4.9 m. The other end of the spring (see the figure) is fixed. The system lies on a horizontal frictionless surface. The block is stretched by 0.2 m and released from rest at t = 0. It then executes simple harmonic motion with angular frequency ω = π /3 rad/s. simultaneously at t = 0, a small pebble is projected with speed v from point P at an angle of 45° as shown in the figure. Point P is at a horizontal distance of 10 m from O. If the pebble hits the block at t =1 s, the value of v is (Take g = 10 in/s²)

A

B

C

D

Solution

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