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Class 10 Class 12
The length, breadth and thickness of a rectangular sheet of metal are 4.234 m, 1.005 m, and 2.01 cm respectively. Give the area and volume of the sheet to correct significant figures.

Given,

Length, l = 4.234 m

Thickness, t = 2.01 cm = 2.01 × 10-2 m

Area of the sheet = 2 (l × 0 + b × t + t × l)

= 2 (4.234 × 1.005 + 1.005 × 0.0201 + 0.0201 × 4.234)

= 2 (4.3604739)

= 8.7209478 m2

Area can contain a maximum of three significant digits, therefore, rounding off, we get

Area = 8.72 m2

Also, volume = l × b × t

V = 4.234 × 1.005 × 0.0201

= 0.0855289

= 0.0855 m3 (Significant Figures = 3)

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Give four examples of physical quantities.

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What is measurement?

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Define unit.

The quantity used as a standard of measurement is called unit.

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Define physical quantity.

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