JEE Main: Laws Of Motion Set 1 Quiz! Physics

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| By Tanmay Shankar
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Tanmay Shankar
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JEE Main: Laws Of Motion Set 1 Quiz! Physics - Quiz

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Questions and Answers
  • 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

    Correct Answer
    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 block of mass M is suspended on the side ‘A’ of a pulley with a string. A monkey of mass 2M is climbing on the side B with a uniform acceleration of g/4 (with respect to rope). If there is no friction between pulley and string and between string and monkey then what will be the tension in the string? 

    • A.

      13/18 Mg

    • B.

      3/2 Mg

    • C.

      4 Mg

    • D.

      5/2 Mg

    Correct Answer
    B. 3/2 Mg
  • 3. 

    A block of mass M1 is attached to a string of mass M2 and length L. If a horizontal force F is applied on the string to pull the block then what will be the tension at the midpoint of the string?

    Correct Answer
    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

    Correct Answer
    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

    Correct Answer
    D. 3.6
    Explanation
     

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  • 6. 

     

    Correct Answer
    C.
  • 7. 

    In the arrangement shown in the figure, the block of mass ‘m’ is moving upward with acceleration ‘a’. The tension in all the string is same. If whole system starts from rest then what will be the value of velocity ‘v’ after 2 seconds?

    Correct Answer
    A.
  • 8. 

    Three forces F1, F2 and F3 are acting on a block of mass ‘M’. The box is in the state of equilibrium and force F2 is perpendicular to the force F3. Force F1 is removed and due to it, the box starts moving with some acceleration. What should be the value of acceleration?

    Correct Answer
    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. 

    Correct Answer
    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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  • Mar 20, 2023
    Quiz Edited by
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  • Aug 11, 2014
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    Tanmay Shankar
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