Laws of Motion (NEET Physics): Questions 108 - 111 of 114

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Question number: 108

» 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: 109

» Laws of Motion » Laws of Friction

MCQ▾

Question

Choose the correct statements -

(1) Force of friction is partially independent of microscopic area of surface in contact and relative velocity between them, (if it is not high)

(2) Normally with increase in smoothness friction decreases. But if the surface area are made too smooth by polishing and cleaning the bonding force of adhesion will increase and so the friction will increase resulting in ‘Cold welding’

(3) Friction is a non-conservative force, i. e. work done against friction is path dpendent.

(4) Force of friction depends on area

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 2 are correct

d.

1 and 3 are correct

Question number: 110

» Laws of Motion » Laws of Friction

MCQ▾

Question

A body of mass 400 g slides on a rough horizontal surface. If the frictional force is 3.0 N, the magnitude of the contact force is (g = 10 m/s 2)

Choices

Choice (4) Response

a.

5.0 N

b.

3.0 N

c.

4.0 N

d.

7.0 N

Question number: 111

» Laws of Motion » Laws of Friction

MCQ▾

Question

A block of metal is lying on the floor of a bus. The maximum acceleration which can be given to the bus so that the block may remain at rest, will be –

Choices

Choice (4) Response

a.

μ/g

b.

μ 2 g

c.

μg

d.

μg 2

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