Question:

The magnitude of any physical quantity

Updated On: Aug 1, 2022
  • depends on the method of measurement
  • does not depend on the method or measurement
  • is more in SI system than in CGS system
  • directly proportional to fundamental unit of mass. length and time
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The Correct Option is B

Solution and Explanation

The magnitude of any physical quantity clocs not depend on the method of measurement because magnitude is absolute.
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Concepts Used:

Uncertainty in Measurement

  • Atoms and molecules consist of very low mass. But they are present in huge numbers.
  • Chemists have to deal with numbers as large as 602,200,000,000,000,000,000,000, which is the number of molecules of 2g of hydrogen.
  • There are even other constants like the speed of light, charges on particles, Avogadro’s number and etc.
  • To handle these large or small numbers, we use the following notation: m × 10n, which is, m times ten raised to the power of n. In this expression, n is an exponent having positive and negative values and m is that number that varies from 1.000… and 9.999…
  • The scientific notation 573.672 can be written as 5.73672 × 10 and in the same way, 0.000089 can also be written as 8.9 × 10-5.
  • All of these help us to attain easier handling, better precision, and accuracy while performing operations on numbers with high magnitudes.

Read More: Uncertainty in Measurement