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2. Units and Measurements
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Q10 of 44 Page 5

The mean length of an object is 5 cm. Which of the following measurements is most accurate?

A measurement is said to be accurate if its value is closest to the real value of the physical quantity.


Here,






4.9 has the least difference. Hence 4.9 is most accurate.

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8

You measure two quantities as A = 1.0 m ± 0.2 m, B = 2.0 m ± 0.2 m. We should report correct value for as:

9

Which of the following measurements is most precise?

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Young’s modulus of steel is 1.9 × 1011 N/m2. When expressed in CGS units of dynes/cm2, it will be equal to (1N = 105 dyne, 1m2 = 104 cm2)

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Questions · 44
2. Units and Measurements
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