Prelim Standard 2 Units of Measurement 1

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The length of a window is measured as 2.4 m. Which calculation will give the percentage error for this measurement?

1 point

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In a school experiment, a student measured a length to be 9.4 cm. What is the upper limit of accuracy of this measurement?

1 point

9.41 cm

9.45 cm

9.5 cm

9.9 cm

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The number of significant figures in the number 5.081 x 10²

1 point

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A person’s weight is measured as 79.3 kg.What is the absolute error of this measurement?

1 point

10 grams

50 grams

100 grams

500 grams

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

1 point

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A plant stem is measured to be 16.0 cm, correct to one decimal place.What is the percentage error in this measurement?

1 point

0.3125%

0.625%

3.125%

6.25%

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Nick has 2500 photos on his computer which have an average size of 3.2 MB.He wants to back up these photos onto USB drives which have a capacity of 4 GB.How many of these drives would he need to back up all of the photos?

1 point

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An electronic timing device that measures to the nearest tenth of a second is used to time footraces at an athletics carnival. What is the percentage error (to 2 decimal places) in a 100-metre race that was timed at 10.5 seconds.

1 point

0.45%

0.48%

0.50%

0.54%

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1 point

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Betty measures her height to be 1.66 m correct to the nearest centimetre. What is the percentage error in her measurement.

1 point

0.003%

0.006%

0.3%

0.6%

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