JEE Advanced 2025 · Paper 1 · Physics Q6

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PhysicsMultiple correct+4 / -2Question 22 of 48

Length, breadth and thickness of a strip having a uniform cross section are measured to be 10.5 cm, 0.05 mm, and 6.0 $\mu$ m, respectively. Which of the following option(s) give(s) the volume of the strip in cm $^3$ with correct significant figures:

3.2\times10^{-5}

32.0\times10^{-6}

3.0\times10^{-5}

3\times10^{-5}

Answer and worked solution

Official answer: D

In cm:
$V=10.5\times0.005\times6.0\times10^{-4}=3.15\times10^{-5}\ \text{cm}^3.$

The breadth 0.05 mm has only one significant figure, so the product is limited to one significant figure: $3\times10^{-5}$ cm $^3$ .

Options (A), (B) and (C) all show more significant figures than the data allow.

Topics:Significant figures

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