NEET Physics: Questions 957 - 959 of 2098

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Question number: 957

» Kinematics » Uniformly Accelerated Motion

MCQ▾

Question

Two blocks of masses 5 kg and 3 kg connected by a rope of mass 2 kg are resting on frictionless floor. If a constant force of 40 N is applied to 6 kg block, tension in the rope at A, B, and C will respectively be –

Choices

Choice (4) Response

a.

30N, 25N, 20N

b.

28N, 24N, 20N

c.

25N, 30N, 20N

d.

30N, 20N, 25N

Question number: 958

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

The rate of burning of fuel in a rocket is 50 gm/sec. and comes out with and velocity 4 x 10 3 m/s. The force exerted by gas on rocket will be –

Choices

Choice (4) Response

a.

2.5 x l0 4 N

b.

250 N

c.

2.5 x l0 6 N

d.

200 N

Question number: 959

» 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

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