$$5.2 \times 10^3$ (rounded to 2 sig figs)

Question 1

Which of the following measurements contains exactly 3 significant figures?

Accepted Answer

$$0.00450$$

Question 2

Why is it important to know the number of significant figures in a measured value?

Accepted Answer

It relates to the measurement scale and ensures calculated results do not exceed the precision of the measured values.

Question 3

How many significant figures are in the measurement $$0.010020 m$$?

Accepted Answer

5

Question 4

Which rule applies to zeros between nonzero digits in a measurement?

Accepted Answer

They are always significant.

Question 5

A student measures the mass of a sample as $$500 g. $$How many significant figures does this measurement have?

Accepted Answer

1

Question 6

When multiplying $$2.5 (2 $$sig figs) by $$3.42 (3 $$sig figs), how many significant figures should the result have?

Accepted Answer

2

Question 7

Which of the following best describes how to round the result of an addition problem involving significant figures?

Accepted Answer

Round to the same number of decimal places as the number with the fewest decimal places.

Question 8

Calculate $$1.9 + 38.2123 + 33.5$$ and report the answer to the correct number of significant figures.

Accepted Answer

$$73.6$$

Question 9

Which measurement has the greatest number of significant figures?

Accepted Answer

$$0.004500$$

Question 10

A scientist records a value as $$770 (2 $$sig figs) and multiplies it by $$6.72 (3 $$sig figs). What is the correct way to report the result?

Accepted Answer

$$5.2 	imes 10^3$ (rounded to 2 sig figs)

Question 11

Which of the following is true about trailing zeros in a measurement?

Accepted Answer

They are significant only if there is a decimal point.

Question 12

A hospital lab reports a blood glucose level as $$0.0560 g/dL. $$How many significant figures does this value have?

Accepted Answer

4

Question 13

Which of the following measurements is reported to the highest precision?

Accepted Answer

$$0.00450$$

Question 14

If you subtract $$12.345$$ from $$13.2$$, how should you report the result?

Accepted Answer

$$0.9$$

Question 15

Which of the following is NOT a rule for determining significant figures?

Accepted Answer

Leading zeros are significant.

Question 16

A chemist divides $$100.0 mL by$$ $$3.0 mL. $$How many significant figures should the result have?

Accepted Answer

2

Question 17

Which of the following measurements has only one significant figure?

Accepted Answer

$$500$$

Question 18

A student adds $$2.34 g $$and $$0.056 g. $$What is the correct way to report the sum?

Accepted Answer

$$2.40 g ($$rounded to 2 decimal places)

Question 19

Which of the following is a real-world consequence of reporting too many significant figures in a medical test result?

Accepted Answer

It may suggest a false level of precision, leading to incorrect medical decisions.

Question 20

When dividing $$123.45 by$$ $$6.7$$, what is the correct number of significant figures in the result?

Accepted Answer

2

Significant Figures: Concepts, Rules, and Calculations

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