NEET Physics: Questions 948 - 951 of 2142

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Question number: 948

» Laws of Motion » Force and Inertia

Assertion-Reason▾

Assertion (Ꭺ)

Block A is moving on horizontal surface towards right under the action of force F. All surfaces are smooth. At the instant shown the force exerted by block A on block B is equal to net force on block B.

Reason (Ꭱ)

From Newton’s third law of motion, the force exerted by block A on B is equal in magnitude to force exerted by block B on A.

Net force acting on each of block A and B

Net Force Acting on Each of Block a and B

Finding force and acceleration on both blocks A and B

Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are false

b.

Ꭺ is true but Ꭱ is false

c.

Ꭺ is false but Ꭱ is true

d.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

Question number: 949

» Kinematics » Uniformly Accelerated Motion

MCQ▾

Question

A force produces an acceleration of 10 m/s 2 in a body and same force an acceleration of 25 m/s 2 in another body. The acceleration produced by the same force when applied to the combination of two bodies will be –

Choices

Choice (4) Response

a.

20 m/s 2

b.

3.75 m/s 2

c.

0.667 m/s 2

d.

7.142 m/s 2

Question number: 950

» Laws of Motion » Force and Inertia

MCQ▾

Question

A rope of length 15 m and linear density 2 kg/m is lying length wise on a horizontal smooth table. It is pulled by a force of 25 N. The tension in the rope at the point 7 m away from the point of application, will be –

Choices

Choice (4) Response

a.

36.67 N

b.

13.33 N

c.

11.67 N

d.

All of the above

Question number: 951

» Work, Energy and Power » Work-Energy Theorem

MCQ▾

Question

The earth circles the sun once a year. How much work would have to be done on the earth to bring it to rest relative to the sun, (ignore the rotation of earth about -its own axis) Given that mass of the earth is 6 x 10 24 kg and distance between the sun and earth is 1.5 x 10 8 km-

Choices

Choice (4) Response

a.

1.9 x 10 23

b.

1.9 x 10 24

c.

2.7 x 10 24

d.

2.7 x 10 33

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