Laws of Motion Test

Result

Laws of Motion Test - 66

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Weekly Quiz Competition

Question 1
4 / -1

A block can slide on a smooth inclined plane of inclination θ kept on the floor of a lift. When the lift is descending with a retardation a, the acceleration of the block relative to the incline is

A
(g + a) sin θ

B
(g – a)

C
gsin θ

D
(g – a) sin θ

Solution
Question 2
4 / -1

A 60 kg man stands on a spring scale in the lift. At some instant he finds, scale reading has changed from 60 kg to 50 kg for a while and then comes back to the original mark.
What should we conclude?

A
The lift was in constant motion upwards

B
The lift was in constant motion downwards

C
The lift while in constant motion upwards, is stopped suddenly

D
The lift while in constant motion downwards, is suddenly stopped
Question 3
4 / -1

Three weights A, B and C are connected by string as shown in the figure. The system moves over a frictionless pulley. The tension in the string connecting A and B is (where g is acceleration due to gravity)

A
g

B

C

D

Solution
Question 4
4 / -1

The masses of 10 kg and 20 kg respectively are connected by a massless spring as shown in figure. A force of 200 N acts on the 20 kg mass. At the instant shown, the 10 kg mass has acceleration 12 m/sec².
What is the acceleration of 20 kg mass?

A
12 m/s²

B
4 m/s²

C
10 m/s²

D
Zero

Solution
Question 5
4 / -1

A spring balance and a physical balance are kept in a lift. In these balances equal masses are placed. If now the lift starts moving upwards with constant acceleration, then

A
The reading of spring balance will increase and the equilibrium position of the physical balance will disturb

B
The reading of spring balance will remain unchanged and physical balance will remain in equilibrium

C
The reading of spring balance will decrease and physical balance will remain in equilibrium

D
The reading of spring balance will increase and the physical balance will remain in equilibrium
Question 6
4 / -1

As shown in the figure, two equal masses each of 2 kg are suspended from a spring balance. The reading of the spring balance will be

A
Zero

B
2 kg

C
4 kg

D
Between zero and 2 kg
Question 7
4 / -1

A player kicks a football of mass 0.5 kg and the football begins to move with a velocity of 10 m/s. If the contactbetween the leg and the football lasts for 1/50s, then theforce acted on the football should be

A
2500 N

B
1250 N

C
250 N

D
625 N

Solution
Question 8
4 / -1

The engine of a jet aircraft applies a thrust force of 10⁵N during take off and causes the plane to attain a velocity of 1 km/s in 10 s. The mass of the plane is

A
10² kg

B
10³ kg

C
10⁴ kg

D
10⁵ kg

Solution
Question 9
4 / -1

Two weights w₁ and w₂ are suspended from the ends ofa light string passing over a smooth fixed pulley. If the pulley is pulled up at an acceleration g, the tension inthe string will be

A

B

C

D

Solution
Question 10
4 / -1

Two masses M and m are connected by a weightless string. They are pulled by a force F on a frictionless horizontal surface. The tension in the string will be

A

B

C

D

Solution