The density of a substance is measured as $3.42 imes 10^{-2}$ kg/m$^3$. How many significant figures are in this measurement?

The area of a rectangular garden, whose length is 55.3 m and breadth is 25 m, is to be calculated. Rounding off the value to the correct significant figures, the area is:

A student measures the length of a rod as 25.00 cm using a vernier caliper with a least count of 0.01 cm. The student then uses a meter scale with a least count of 0.1 cm to measure the same rod. Which statement is true regarding the significant figures in these measurements?

The number of significant figures in all the given numbers 25.12, 2009, 4.156 and $1.217 imes {10^{ - 4}}$ is

The measurement $4.00 imes 10^3$ m has how many significant figures?

The radius of a wire is 0.24 mm. Then its area of cross section by taking significant figures into consideration is

A solar panel is 55.3 m long and 25 m wide. To estimate the area for installation purposes, what's the area rounded to the appropriate number of significant figures?

The value of $\frac{4.0 imes 10^{-2} imes 0.00302}{200.0}$ expressed with the correct number of significant figures is:

What is the area of a rectangle with dimensions 5.53 m and 2.5 m, expressed with the correct number of significant figures?

What is the sum of 2.34 g and 0.021 g expressed with the correct number of significant figures?

How many significant figures are in the number 0.00420?