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Question (1)

QN0035106

Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses
Assertion : A bullet is fired from a rifle. If the rifle recoils freely, the kinetic energy of rifle is more than that of the bullet.
Reason : In case of rifle bullet system, the law of conservation of momentum violates.

(A)
If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion
(B)
If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
(C)
If the Assertion is correct but Reason is incorrect.
(D)
If the Assertion is incorrect and Reason is correct.

Correct Answer: D

Explanation:

A single isolated force is not possible.

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Question (2)

QN0035107

Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.
Assertion : A rocket works on the principle of conservation of linear momentum.
Reason : Whenever there is change in momentum of one body, the same change occurs in the momentum of the second body of the same system but in the opposite direction, provided external force is acting.

(A)
If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
(B)
If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
(C)
If the Assertion is correct but Reason is incorrect.
(D)
If the Assertion is incorrect and Reason is correct.

Correct Answer: C

Explanation:

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Question (3)

QN0035108

Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.
Assertion : The two bodies of masses and are allowed to fall from the same height if the air resistance for each be the same then both the bodies will reach the earth simultaneously.
Reason : For same air resistance, resultant acceleration of both the bodies will be same.

(A)
If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
(B)
If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.q
(C)
If the Assertion is correct but Reason is incorrect.
(D)
If the Assertion is incorrect and Reason is correct.

Correct Answer: D

Explanation:

The force acting on the body of mass are its weight acting vertically downward and air resistance acting vertically upward.

Acceration of the body,

Now , therefore, the body with larger mass will have great acceleration and it will reach the ground first.

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Question (4)

QN0035109

Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.
Assertion : A block placed on a table is at rest, because action force cancels the reaction force on the block.
Reason : The net force on the block is not equal to zero.

(A)
If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
(B)
If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
(C)
If the Assertion is correct but Reason is incorrect.
(D)
If the Assertion is incorrect and Reason is correct.

Correct Answer: D

Explanation:

The net force on the block is zero, but action cannot cancel the reaction because these two act on different bodies.

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Question (5)

QN0035110

Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.
Assertion : On a rainy day, it is difficult to drive a car or bus at high speed.
Reason : The value of coefficient of friction is lowered due to wetting of the surface.

(A)
If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
(B)
If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
(C)
If the Assertion is correct but Reason is incorrect.
(D)
If the Assertion is incorrect and Reason is correct.

Correct Answer: A

Explanation:

On a rainy day, the roads are wet. Wetting of roads lowers the coefficient of friction between the types and the road. Therefore, grip on a road of car reduces and thus chances of skidding increases.

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Question (6)

QN0035111

Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.
Assertion: Friction is a necessary evil.
Reason: When two bodies does not slip over each other, the friction force is called kinetic friction.

(A)
If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
(B)
If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion
(C)
If the Assertion is correct but Reason is incorrect.
(D)
If the Assertion is incorrect and Reason is correct.

Correct Answer: C

Explanation:

Friction causes wear & tear and loss of energy, so it is an evil but without friction, walking and stopping a vehicle etc. would not be possible. So it is necessary for us.

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