Question 1

How many significant digits are in the number 0.003420?

Accepted Answer

3

Question 2

Which of the following numbers has exactly 4 significant digits?

Accepted Answer

0.0004000

Question 3

A student records the mass of a sample as 1.009650 g. How many significant digits does this measurement have?

Accepted Answer

6

Question 4

Which of the following best describes the result of a measurement that is close to the true value but not reproducible in repeated trials?

Accepted Answer

Accurate but not precise

Question 5

When multiplying 3.05 by 5.555 and then by 3.0, how many significant digits should the final answer have?

Accepted Answer

2

Question 6

Which of the following numbers contains only 1 significant digit?

Accepted Answer

30,000,000

Question 7

Convert 2,340 to scientific notation with the correct number of significant digits.

Accepted Answer

$$1.234 	imes 10^3$

Question 8

A measurement is recorded as 0.0000800. How many significant digits does it have?

Accepted Answer

3

Question 9

A student divides $$432\ \mathrm{cm} by$$ $$12.5\ \mathrm{cm}. $$What is the answer rounded to the correct number of significant digits?

Accepted Answer

$$34.6$$

Question 10

Which of the following statements about zeros is correct?

Accepted Answer

Zeros between nonzero digits are always significant.

Question 11

A laboratory scale gives the following masses for a 137.0 g standard: 146.0 g, 148.0 g, 140.0 g. Which best describes the scale's performance?

Accepted Answer

Neither accurate nor precise

Question 12

Round the number 3.05999 to two significant digits.

Accepted Answer

3.1

Question 13

How many significant digits are in the number 108,400?

Accepted Answer

4

Question 14

Which of the following best explains why 0.00042 has only two significant digits?

Accepted Answer

Leading zeros are not significant.

Question 15

A student calculates $$84 	imes 31.221 on a $$calculator and gets $$2622.564. $$How should this be reported using the correct number of significant digits?

Accepted Answer

$$2600$$

Question 16

Which of the following numbers has exactly 3 significant digits?

Accepted Answer

67,500

Question 17

A student measures a value as 1005 grams three times, but the true value is 169.5 grams. What does this indicate about the measurements?

Accepted Answer

Not accurate but precise

Question 18

Which of the following is the correct standard form for $$8.7 	imes 10$$^{-5}$$?

Accepted Answer

0.000087

Question 19

When dividing $$121 by$$ $$8.0$$, what is the answer rounded to the correct number of significant digits?

Accepted Answer

$$15$$

Question 20

Which of the following best describes the correct way to handle significant digits in a multi-step calculation?

Accepted Answer

Carry extra digits through all steps and round only the final answer.

Significant Figures: Rules, Accuracy & Precision, and Calculations

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