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Assertion : A rocket moves forward by p...

Assertion : A rocket moves forward by pushing the surrounding air backwards .
Reason : It derives the necessary thrust to move forward , according to Newton's second law .

A

Both assertion and reason are true and reason is correct explanation of assertion

B

Both assertion and reason are true but reason is not the correct explanation of assertion

C

Assertion is true but reason is false

D

Assertion is false , but the reason is true .

Text Solution

Verified by Experts

The correct Answer is:
D
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Consider a horse attached to the cart which is initially at rest. If the horse starts walking forward, the cart also accelerates in the forward direction. If the horse pulls the cart with force F_(h) in forward direction, then according to Newton’s third law, the cart also pulls the horse by equivalent opposite force F_(c)=F_(h) in backward direction. Then total force on ‘cart+horse’ is zero. Why is it then the ‘cart+horse’ accelerates and moves forward?

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Knowledge Check

  • Assertion: A rocket moves forward by pushing the air backwards. Reason: It derives the necessary thrust to move forwarded according to Newton's third law of motion.

    A
    If both the assertion and the reason are true and the reason is the correct explanation of assertion.
    B
    If both the assertion and the reason are true, but the reason is not the correct explanation of the assertion.
    C
    Assertion is true, but the reason is false.
    D
    Assertion is false , but the reason is true.

  • Assertion: When a bullet is fired from a gun, the bullet moves forward , the gun moves backward. Reason: Total momentum before collision is equal to the total momentum after collision.

    A
    Both Assertion and Reason are true and Reason explains Assertion
    B
    Both Assertion and Reason are true but Reason doesn't explain Assertion.
    C
    Both Assertion and Reason are false
    D
    Assertion is true but Reason is false

  • Assertion (A): Chemical equilibrium is in a state of dynamic equilibrium. Reason (R): At equilibrium the forward and backward reactions are proceeding at the same rate and no macroscopic change is observed.

    A
    Both (A) and (R) are correct and (R) is the correct explanation of (A),
    B
    Both (A) and (R) are correct but (R) is not the correct explanation of (A).
    C
    (A) is correct but (R) is wrong
    D
    (A) is wrong but (R) is correct

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