NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 91 - 95 of 2184

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Question number: 91

» Physics and Measurement » Errors in Measurement

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MCQ▾

Question

If there is a positive error of 50 % in the measurement of velocity of a body, then the error in the measurement of kinetic energy is

Choices

Choice (4) Response

a.

50%

b.

25%

c.

125%

d.

75%

Question number: 92

» Physics and Measurement » Errors in Measurement

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MCQ▾

Question

The unit of percentage error is

Choices

Choice (4) Response

a.

Same as that of physical quantity

b.

Different from that of physical quantity

c.

Percentage error is unitless

d.

Errors have got their own units which are different from that of physical quantity measured

Question number: 93

» Kinematics » Motion in a Straight Line

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MCQ▾

Question

A ball is thrown vertically upwards. Which of the following graphs represent velocity-time graph of the ball during its flight? (Air resistance is neglected)

Choices

Choice (4) Response

a.

velocity-time graph of the ball - Choice B

Velocity-Time Graph of the Ball - Choice B

velocity-time graph of the ball - Answer B

b.

velocity-time graph of the ball - Choice C

Velocity-Time Graph of the Ball - Choice C

velocity-time graph of the ball -Answer c

c.

velocity-time graph of the ball -Choice D

Velocity-Time Graph of the Ball -Choice D

velocity-time graph of the ball - Answer D

d.

None of the above

Question number: 94

» Physics and Measurement » Dimensions of Physical Quantities

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MCQ▾

Question

P represents radiation pressure, c represents speed of light and S represents radiation energy striking unit area per sec. The non-zero integers x, y, z such that P x S y c z is dimensionless are

Choices

Choice (4) Response

a.

x=-1

b.

x = 1

c.

y = 1

d.

z = 1

Question number: 95

» Kinematics » Motion in a Straight Line

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Assertion-Reason▾

Question

Assertion (Ꭺ)

The position-time graph of a uniform motion in one dimension of a body can have negative slope.

Reason (Ꭱ)

When the speed of body decreases with time, the position-time graph of the moving body has negative slope.

Choices

Choice (4) Response

a.

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

b.

Ꭺ is true but Ꭱ is false

c.

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

d.

Both Ꭺ and Ꭱ are false