NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 130 - 132 of 2320

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Question number: 130

» Kinematics » Average Speed and Instantaneous Velocity

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MCQ▾

Question

A person aiming to reach the exactly opposite point on the bank of a stream is swimming with a speed of 0.5 m/s at an angle of 120° with the direction of flow of water. The speed of water in the stream is

Choices

Choice (4)Response

a.

0.433 m/s

b.

lm/s

c.

0.25 m/s

d.

0.5 m/s

Question number: 131

» Kinematics » Motion in a Straight Line

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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.

x cannot be less than du/v

b.

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

c.

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.

d.

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.

Question number: 132

» Kinematics » Scalars and Vectors » Scalar and Vector Products

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Assertion-Reason▾

Question

Assertion (Ꭺ)

If|A + B|=| A-B|, then angle between A and B is 90°

Reason (Ꭱ)

A + B = B + A

Choices

Choice (4)Response

a.

Both Ꭺ and Ꭱ are false

b.

Ꭺ is false but Ꭱ is true

c.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

d.

Ꭺ is true but Ꭱ is false

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