NEET Physics: Questions 851 - 854 of 2098

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Question number: 851

» Work, Energy and Power » Work Done

MCQ▾

Question

A particle moving in a straight line is acted by a force, which works at a constant rate and changes its velocity from u to v in passing over a distance x. The time taken will be –

Choices

Choice (4) Response

a.

32x(v2+u2v3u3)

b.

X=Vuv2+u2

c.

X=Vuv2+u2

d.

X(vu)

Question number: 852

» 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: 853

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

The mass of a rocket is 600 kg and the relative velocity of the gases ejecting from it is 250 m/s with respect to the rocket. The rate of burning of the fuel in order to give the rocket an initial acceleration 20 m/s 2 in the vertically upward direction (g = 10 m/s 2), will be –

Choices

Choice (4) Response

a.

10 kg/s

b.

60 kg/s

c.

72 kg/s

d.

30 kg/s

Question number: 854

» Work, Energy and Power » Potential Energy

MCQ▾

Question

A tennis ball dropped from a height of 5 m rebounds only 2.5 f meter after hitting the ground. What fraction of energy is lost in the impact?

Choices

Choice (4) Response

a.

1.26

b.

0.466

c.

0.5

d.

2.45

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