smc-1120-30-Significant Figures

Measurement, STD1 M1 2022 HSC 4 MC

The area of a circle is given by the formula , where is the radius.

What is the value of , correct to three significant figures, if ?

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♦♦ Mean mark 30%.
COMMENT: Significant figures warrant attention.

Suppose , where

What is the value of , correct to three significant figures?

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♦ Mean mark 37%.

What is 0.002073 expressed in standard form with two significant figures?

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♦♦♦ Mean mark 12%.

What is 0.002073 expressed in standard form with two significant figures?

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♦♦ Mean mark 35%.
COMMENT: A notable knowledge gap flagged by this result.

What is 208.345 correct to two significant figures?

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♦♦ Mean mark 36%!!

What is 1 560 200 km written in standard form correct to two significant figures?

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♦♦ Mean mark 30%.
COMMENT: Incredibly, the first MC question in 2015 had the lowest mean mark of all MC questions in the exam!