NEET (National Eligibility cum Medical Entrance Test) Physics: Questions 128 - 131 of 2142

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Question number: 128

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

The length of second’s hand in watch is 1 cm. The change in velocity of its tip in 15 seconds is

Choices

Choice (4) Response

a.

zero

b.

Equation cm/sec

c.

Equation cm/sec

d.

Equation cm/sec

Question number: 129

» Kinematics » Average Speed and Instantaneous Velocity

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.

lm/s

b.

0.433 m/s

c.

0.25 m/s

d.

0.5 m/s

Question number: 130

» 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.

Question number: 131

» Kinematics » Scalars and Vectors » Scalar and Vector Products

Assertion-Reason▾

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.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

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