NEET (National Eligibility cum Medical Entrance Test) Physics: Questions 923 - 925 of 2142

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Question number: 923

» Work, Energy and Power » Kinetic Energy

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 and 2 are correct

c.

1 and 3 are correct

d.

1, 2 and 3 are correct

Question number: 924

» Laws of Motion » Laws of Friction

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.

Equation

b.

Equation

c.

Equation

d.

Equation

Question number: 925

» Laws of Motion » Force and Inertia

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

Pulley arrangement with rope

Choices

Choice (4) Response

a.

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

b.

In both the cases, acceleration is same

c.

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

d.

All of the above

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