# JEE Main: Laws Of Motion Set 1 Quiz! Physics

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Tanmay Shankar
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• 1.

### A block of mass 15 kg is suspended by three strings as shown in the figure. Choose the correct option on the basis of the diagram. (Take g = 10 m/s2)

• A.

TA = 400N, TB = 500N

• B.

TA = 200N, TB = 250N

• C.

TA = 302.5N, TB = 225N

• D.

TA = 225N, TB = 112.5N

B. TA = 200N, TB = 250N
Explanation
From the diagram it is clear that there are three forces acting in the same point. We can apply Lami’s Theorem

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• 2.

• A.

13/18 Mg

• B.

3/2 Mg

• C.

4 Mg

• D.

5/2 Mg

B. 3/2 Mg
• 3.

A.
• 4.

### A lift is going up and the change in the speed of the lift is shown with the help of the diagram. If the total mass of the lift with passenger is 1600 kg then what will be the tension in the rope pulling the lift at time t = 9 seconds.

• A.

17700 N

• B.

15000 N

• C.

12000 N

• D.

12300 N

C. 12000 N
Explanation
As per the diagram the speed of the lift is increasing in the first 2 seconds. From 2s to 8s, the speed of the lift is constant and for the last two seconds, the speed of the lift is decreasing. At the 9th second, there will be retardation. The tension in the rope will only be due to the weight of the lift and the person in the lift. The direction of the weight will be opposite to the direction of the tension in the rope.

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• 5.

### A car of mass 1500 kg collides with another car (In the state of rest) of mass 1350 kg due to which the second car starts moving with an acceleration of 4 . What will be the acceleration of the first car?

• A.

4.8 m/s2

• B.

7.75 m/s2

• C.

5.2

• D.

3.6

D. 3.6
Explanation

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• 6.
C.
• 7.

A.
• 8.

D.
• 9.

### A pendulum, with a bob of mass ‘m’, is hung from the ceiling of a car. The car is ascending on an inclined plane with an angle of inclination = 450. If the car is moving with an acceleration a= g, then what will be the angle subtended by the string of the pendulum with the normal to the ceiling in equilibrium.

C.
Explanation
Let the angle in the state of equilibrium with the normal = α; then from the free body diagram of car;

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• Current Version
• Mar 20, 2023
Quiz Edited by
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• Aug 11, 2014
Quiz Created by
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