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Q.

The length of a strip measured with a metre rod is 10.0 cm. Its width measured with a vernier calipers is 1.00 cm. The least count of the metre rod is 0.1 cm and that of vernier calipers 0.01 cm. What will be error in its area?

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a

±13%

b

±7%

c

±4%

d

±2%

answer is D.

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Detailed Solution

A=l×w

ΔAA×100=Δll×100+Δww×100

=0.110.0×100+0.011.0×100=±2%

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