Physics and Measurement-Errors in Measurement (NEET Physics): Questions 1 - 5 of 29

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Question number: 1

» Physics and Measurement » Errors in Measurement

MCQ▾

Question

The resistance R = V/i where V = 100 + or - 5 volts and i = 10 + 0.2 amperes. What is the total error in R?

Choices

Choice (4) Response

a.

7 %

b.

5 %

c.

5/2 %

d.

5.2 %

Question number: 2

» Physics and Measurement » Errors in Measurement

MCQ▾

Question

If the length of rod A is 3.25 + 0.01 cm and that of B is 4.19 + 0.01 cm then the rod B is longer than rod A by

Choices

Choice (4) Response

a.

0.94 + 0.00 cm

b.

0.94 + 0.02 cm

c.

0.94 + 0.01 cm

d.

None of the above

Question number: 3

» Physics and Measurement » Errors in Measurement

Assertion-Reason▾

Assertion (Ꭺ)

Out of three measurements l = 0.7 m; l = 0.70 m and l = 0.700 m, the last one is most accurate.

Reason (Ꭱ)

In every measurement, only the last significant digit is not accurately known.

Choices

Choice (4) Response

a.

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

b.

Ꭺ is false but Ꭱ is true

c.

Both Ꭺ and Ꭱ are false

d.

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

Question number: 4

» Physics and Measurement » Errors in Measurement

MCQ▾

Question

The period of oscillation of a simple pendulum is given by T = 2π

lg

where l is about 100 cm and is known to have l mm accuracy. The period is about 2s. The time of 100 oscillations is measured by a stopwatch of least count 0.1s. The percentage error in g is

Choices

Choice (4) Response

a.

0.8%

b.

0.1%

c.

1%

d.

0.2%

Question number: 5

» Physics and Measurement » Errors in Measurement

MCQ▾

Question

The random error in the arithmetic mean of 100 observations is x; then random error in the arithmetic mean of 400 observations would be

Choices

Choice (4) Response

a.

4x

b.

2 x

c.

0.25 x

d.

0.5x

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