NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 924 - 926 of 2320

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Question number: 924

» Work, Energy and Power » Kinetic Energy

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MCQ▾

Question

Which of the following hold when two particles of masses m 1 and m 2 undergo elastic collision?

(1) When m, = m 2 and m 2 is stationary, there is maximum transfer of kinetic energy in head on collision

(2) When m i = va 2 and m 2 is stationary, there is maximum transfer of momentum in head on collision

(3) When m l > > m 2 and m 2 is stationary, after head on collision m 2 moves with twice the velocity of m 1

(4) When the collision is oblique and m 1 = m 2 with m 2 stationary, after the collision the particle move in opposite directions.

Select the correct answers and mark it according to the following codes

Choices

Choice (4)Response

a.

2 and 4 are correct

b.

1,2 and 3 are correct

c.

1 and 3 are correct

d.

1 and 2 are correct

Question number: 925

» Laws of Motion » Laws of Friction

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MCQ▾

Question

A block placed on a horizontal surface is being pushed by a force F making an angle 0 with the vertical, if the coefficient of friction is|x, how much force is needed to get the block just started?

Choices

Choice (4)Response

a.

b.

c.

d.

Question number: 926

» Laws of Motion » Force and Inertia

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MCQ▾

Question

The pulley arrangements of fig (A) and (B) are identical. TW mass of the rope is negligible. In (A) the mass m is lifted up by attaching a mass 2 m to the other end of the rope. In (B) I m is lifted up by pulling the other end of the rope with a constant downward force F = 2 mg. Which of the following is correct?

Pulley arrangement with mass and the force

Pulley Arrangement with Mass and the Force

Choices

Choice (4)Response

a.

In case A acceleration is g, while in case B it is 2g

b.

Acceleration in case B is 3 times more than that in case A

c.

In both the cases, acceleration is same

d.

Question does not provide sufficient data or is vague

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