The number of significant figures in 0.007 m² and 2.64 × 10²⁴ kg are respectively:

Model Answer & Options

Source: Extra Practice

1 and 3

4 and 3

3 and 3

1 and 24

Explanation

In 0.007, trailing zeros after a decimal point but before a non-zero digit are not significant, so only '7' is significant (1 figure). In scientific notation (2.64 × 10²⁴), only the coefficients are counted, so '2', '6', and '4' are significant (3 figures). 4 and 3 is wrong because leading zeros are not significant. 3 and 3 is wrong because the zeros in 0.007 are not significant. 1 and 24 is wrong because the power of 10 does not affect significant figures.

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