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Question

The length,breadth and thickness of a rectangular copper sheet are 4cm,2.5cm and 1.56cm respectively. Find the area of the sheet to corrected significant figures.

A
40.3cm2
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B
40.28cm2
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C
40×102cm2
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D
0.4×102cm2
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Solution

The correct option is C 0.4×102cm2
If l be the length, b be the breadth and t be the thickness of the sheet,
then the area of sheet is A=2(lb+bt+tl)=2[(4×2.5)+(2.5×1.56)+(1.56×4)]=40.28cm2
As length has least significant figures i.e one so the answer must be expressed as one significant figures.
Thus according rule of determining significant figures, the area will be 0.4×102cm2

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