Laws of Motion Test

Result

Laws of Motion Test - 33

Score
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Question 1
4 / -1

A

B

C

D
Question 2
4 / -1

A plate of mass M is placed on a horizontal friction less surface and a body of mass m is placed on this plate, The coefficient of dynamic friction between this body and the plate is µ. If a force 2µmg. is applied to the body of mass m along the horizontal direction the acceleration of the plate will be __________

A

B

C

D

Solution
Question 3
4 / -1

On the horizontal surface of a truck ( = 0.6 ), a block of mass 1 kg is placed. If the truck is accelerating at the rale of 5m/s² then frictional force on the block will be ___________ N

A
5

B
6

C
5.88

D
8
Question 4
4 / -1

Two blocks of mass 8 kg and 4 kg are connected a heavy string Placed on rough horizontal Plane, The 4 kg block is Pulled with a constant force F.The co-efficient of friction between the blocks and the ground is 0.5, what is the value of F, So that the tension in the spring is constant throughout during the motion of the blocks ? ( g = 10 ms^–2)

A
40 N

B
60 N

C
50 N

D
30 N

Solution
Question 5
4 / -1

Seven blocks, each of mass 1 kg are arranged one above the other as shown in figure. what are the values of the contact forces exerted on the third block by the forth and the second block respectively ? (g = 10 ms^–2)

A
40 N, 50 N

B
50 N, 40 N

C
40 N, 20 N

D
50 N, 30 N
Question 6
4 / -1

A man is standing on a spring balance. Reading of spring balance is 60 kgf. If man jumps outside balance, then reading of spring balance ________

A
First increase than decreases to zero

B
Decreases

C
Increases

D
Remains same
Question 7
4 / -1

A car turns a corner on a slippery road at a constant speed of 10 m/s. If the coefficient of friction is 0.5, the minimum radius of the arc at which the car turns is _________ meter.

A
20

B
10

C
5

D
4

Solution
Question 8
4 / -1

A person standing on the floor of a lift drops a coin. The coin reaches the floor of the lift in time to if the lift is stationary and the time t² if it is accelerated in upward direction. Then

A

B

C

D
Cannot say anything

Solution
Question 9
4 / -1

A lift of mass 1000 kg is moving with an acceleration of 1 ms^–2 in upward direction. Tension developed in the rope of lift is__________ N (g = 9.8 ms^–2)

A
9800

B
10,000

C
10,800

D
11,000

Solution
Question 10
4 / -1

A
20

B
40

C
10

D
32

Solution