Kinematics-Motion in a Straight Line (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 35 - 39 of 47

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Question number: 35

» Kinematics » Motion in a Straight Line

MCQ▾

Question

The motion of a body is given by the equation dv (t) /dt = 6.0 - 3v (t), where v (t) is speed in m/s and t in sec.

If body was at rest at t = 0

Choices

Choice (4) Response

a.

The speed varies with the time as v (t) = 2 (1 – e -5t) m/s

b.

The magnitude of the initial acceleration is 6.0 m/s2

c.

The speed is 0.1 m/s when the acceleration is half the initial value

d.

The terminal speed is 4 m/s

Question number: 36

» Kinematics » Motion in a Straight Line

MCQ▾

Question

A particle moves towards east with velocity 5 m/s. After 10 seconds its direction changes towards north with same velocity. The average acceleration of the particle is

Choices

Choice (4) Response

a.

m/s 2 S-W

b.

m/s 2 N-W

c.

zero

d.

m/s 2 N-E

Question number: 37

» Kinematics » Motion in a Straight Line

MCQ▾

Question

A 120 m long train is moving towards west with a speed of 10 m/s. A bird flying towards east with a speed of 5 m/s crosses the train. The time taken by the bird to cross the train will be

Choices

Choice (4) Response

a.

8 sec

b.

14 sec

c.

16 sec

d.

12 sec

Question number: 38

» Kinematics » Motion in a Straight Line

MCQ▾

Question

P, Q and R are three coplanar forces acting at a point and are in equilibrium. Given P = 1.9318 kg wt, sin Q = 0.9659, the value of R is (in kg wt)

Choices

Choice (4) Response

a.

2

b.

1

c.

0.9659

d.

0.5

Question number: 39

» Kinematics » Motion in a Straight Line

MCQ▾

Question

A man can swim with velocity v relative to water. He has to cross a river of width d flowing with a velocity u (w > v). The distance through which he is carried downstream by the river is x. Which of the following statements is correct?

Choices

Choice (4) Response

a.

If he crosses the river in minimum time x = du/v

b.

x cannot be less than du/v

c.

Force to be minimum he has to swim in a direction making an angle

of π/2- sin -1 (v/u) with the direction of the flow of water.

d.

x will be maximum if he swims in a direction making

an angle of π/2 + sin-1 - 1 (v/u) with direction of the flow of water.

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