# Significant Figures and their Importance Revision Questions

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The following physics revision questions are provided in support of the physics tutorial on Significant Figures and their Importance. In addition to this tutorial, we also provide revision notes, a video tutorial, revision questions on this page (which allow you to check your understanding of the topic) and calculators which provide full, step by step calculations for each of the formula in the Significant Figures and their Importance tutorials. The Significant Figures and their Importance calculators are particularly useful for ensuring your step-by-step calculations are correct as well as ensuring your final result is accurate.

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Units and Measurements Learning Material
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1.3Significant Figures and their Importance

## 1. Three workers measure three consecutive segments and then they then provide their results in a written form to the supervisor. The results are shown below.

• Segment 1 (measured by worker 1) = 12.24 m
• Segment 2 (measured by worker 2) = 8.4 m
• Segment 3 (measured by worker 3) = 11.187 m

What is the correct value of the sum the supervisor must record?

1. 31.827 m
2. 31.83 m
3. 31.8 m
4. 31.80 m

## 2. Which of the following numbers has more significant figures?

1. 0.0037400 m
2. 3.000003 kg
3. 745 000 000 000 Hz
4. 74.000000000 electrons

## 2. Which number is different from the other from the physics viewpoint?

1. 103.00 × 10-4km
2. 0.010300 km
3. 10.300 m
4. 103 × 10-4km