Laws of Motion (NEET Physics): Questions 68 - 71 of 114

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Question number: 68

» Laws of Motion » Laws of Friction

MCQ▾

Question

Choose the correct statements -

(1) Kinetic friction is lesser than limiting friction.

(2) In rolling the surfaces at contact do not rub each other.

(3) If a body is at rest and no pulling force is acting on it, force of friction on it is zero.

(4) Kinetic friction is greater than limiting friction.

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

Choices

Choice (4) Response

a.

1 and 3 are correct

b.

1, 2 and 3 are correct

c.

2 and 4 are correct

d.

1 and 2 are correct

Question number: 69

» Laws of Motion » Force and Inertia

MCQ▾

Question

Choose the correct options -

(1) Inertia. mass (2) 1 newton = 10 5 dyne

(3) Thrust on rocket f = ∆M/∆t v - Mg

(4) Apparent weight of a body in the accelerated lift is W = m (g + a). …, . ,

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 3 are correct

c.

1, 2 and 3 are correct

d.

1 and 2 are correct

Question number: 70

» Laws of Motion » Laws of Friction

MCQ▾

Question

A block of mass 5 kg is placed on the floor. The coefficient of static friction is 0.2. A force F of 2.5 N is applied on the block, as shown. Calculate the force of friction between the block and the floor, (g = 9.8 ms -2)

Choices

Choice (4) Response

a.

25 N

b.

7.84 N

c.

2.5 N

d.

zero

Question number: 71

» Laws of Motion » Force and Inertia

MCQ▾

Question

Two blocks of mass m = 6 kg and M = 4 kg are in contact on a frictionless table. A horizontal force F (= 5N) is applied to m. The force of contact between the blocks, will be

Choices

Choice (4) Response

a.

2N

b.

4N

c.

IN

d.

5N

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