Laws of Motion Test

Result

Laws of Motion Test - 91

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Weekly Quiz Competition

Question 1
4 / -1

A motor car has a width 1.1 m between wheels. Its centre of gravity is 0.62 m above the ground and the coefficient of friction between the wheels and the road is 0.8. What is the maximum possible speed, if the centre of gravity inscribes a circle of radius 15 m? (Road surface is horizontal )

A
7.64 m/s

B
6.28 m/s

C
10.84 m/s

D
11.23 m/s
Question 2
4 / -1

A rough vertical board has an acceleration \'a\' so that a 2 kg block pressing against it does not fall. The coefficient of friction between the block and the board should be

A
>g/a

B

C
= g/a

D
>a/g
Question 3
4 / -1

A stone weighing 1 kg and sliding on ice with a velocity of 2 m/s is stopped by friction in 10 sec. The force of friction (assuming it to be constant) will be

A
–20 N

B
–0.2 N

C
0.2 N

D
20 N
Question 4
4 / -1

A
25 N

B
100 N

C
50 N

D
Question 5
4 / -1

A child weighing 25 kg slides down a rope hanging from the branch of a tall tree. If the force of friction acting against him is 2 N, what is the acceleration of the child (Take g = 9.8 m/s²)

A
22.5 m/s²

B
8 m/s²

C
5 m/s²

D
9.72 m/s²
Question 6
4 / -1

In the above question, if the lift is moving upwards with a uniform velocity, then the frictional resistance offered by the body is

A
Mg

B
µMg

C
2µMg

D
Zero
Question 7
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
Question 8
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
Question 9
4 / -1

A body 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
Question 10
4 / -1

A small cart with a sphere suspended over it by a string (see Fig.) approaches an inclined plane at a speed V. In which direction with respect to the vertical will the string supporting the sphere be deflected when the cart begins to climb the inclined plane

A
It will remain vertical

B
It will become horizontal

C
It will be perpendicular to the inclined plane

D
None of these