NEET Physics: Questions 923 - 925 of 2142

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Question number: 923

» 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: 924

» 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

Question number: 925

» Laws of Motion » Laws of Friction

MCQ▾

Question

Choose the correct options -

(1) Friction always opposes the motion

(2) Friction may opposes the motion

(3) If the applied force is increased the force of static friction remains constant.

(4) If the applied force is increased the force of static friction also increases upto limiting friction.

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

Choices

Choice (4) Response

a.

1, 2 and 3 are correct

b.

1 and 2 are correct

c.

2 and 4 are correct

d.

1 and 3 are correct

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