Physics and Measurement (NEET (National Eligibility cum Medical Entrance Test) Physics): Questions 19 - 22 of 62

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Question number: 19

» Physics and Measurement » Technology and Society

Assertion-Reason▾

Assertion (Ꭺ)

Parallax method cannot be used for measuring distances of stars more than 100 light years away.

Reason (Ꭱ)

Because parallax angle reduces so much that it cannot be measured accurately.

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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Question number: 20

» Physics and Measurement » Dimensions of Physical Quantities

MCQ▾

Question

Which of the following pairs have same dimensions?

Choices

Choice (4) Response

a.

Torque and work

b.

Light year and wavelength

c.

Energy and Young’s modulus

d.

Both a. and b. are correct

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Question number: 21

» Physics and Measurement » Errors in Measurement

MCQ▾

Question

If 97.52 is divided by 2.54, the correct result in terms of significant figures is

Choices

Choice (4) Response

a.

38.4

b.

38.39

c.

38.394

d.

38.937

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Question number: 22

» Physics and Measurement » Errors in Measurement

MCQ▾

Question

In the context of accuracy of measurement and significant figures in expressing results of experiment, which of the following is/are correct?

  1. Out of the two measurements 50.14 cm and 0.00025 ampere, the first one has greater accuracy
  2. Out of the two measurements 50.14 cm and 0.00025 ampere, the second has greater accuracy
  3. If one travels 697 m by rail and 478 km by road, the total distance is 478.697 km.
  4. If one travels 478 km by rail and 397 m by road, the total distance travelled is 875 km.

Choices

Choice (4) Response

a.

1 and 3

b.

1 and 2

c.

2 and 4

d.

1, 2, 3

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