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Class 10 Class 12
State the number of significant figures in the following :
a) 0.007 m2

b) 2.64 1024kg
(c) 0.2370 g cm–3
(d) 6.320 J
(e) 6.032 N m
–2
(f) 0.0006032 m2

a) 1

The given quantity is 0.007 m2

If the number is less than one, then all zeros on the right of the decimal point (but left to the first non-zero) are insignificant. This means that here, two zeros after the decimal are not significant. Hence, only 7 is a significant figure in this quantity.

b) 3

Here, the power of 10 is irrelevant for the determination of significant figures. Hence, all the digits are significant figures.

c) 4

d) 4

e) 4

f) 4

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What is measurement?

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Give four examples of physical quantities.

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