Question 1

Which of the following statements best describes the difference between accuracy and precision in scientific measurements?

Accepted Answer

Accuracy refers to how close a measurement is to the true value, while precision refers to how close repeated measurements are to each other.

Question 2

A student measures the mass of a sample three times and obtains values of 2.51 g, 2.50 g, and 2.52 g. The true mass is 2.80 g. Which statement best describes the measurements?

Accepted Answer

The measurements are precise but not accurate.

Question 3

How many significant figures are in the measurement 0.00450 mL?

Accepted Answer

3

Question 4

Which of the following numbers contains exactly four significant figures?

Accepted Answer

2.300

Question 5

When multiplying 2.34 (three significant figures) by 0.056 (two significant figures), how many significant figures should the answer have?

Accepted Answer

Two

Question 6

Which of the following is an example of an exact number?

Accepted Answer

4 apples in a basket

Question 7

A measurement is recorded as 15.22 g. Rounded to three significant figures, what is the value?

Accepted Answer

$$15.2$$

Question 8

Which of the following numbers has five significant figures?

Accepted Answer

560.00

Question 9

When adding 12.45 g and 0.321 g, what is the correct answer with proper significant figures?

Accepted Answer

$$12.77 g$$

Question 10

Which of the following best describes a trailing zero in significant figures?

Accepted Answer

A zero to the right of the last nonzero digit that is only significant if the number contains a decimal point.

Question 11

A student records the following measurements for the length of a table: 2.01 m, 2.00 m, 2.02 m, and 2.01 m. The actual length is 2.50 m. Which statement is true?

Accepted Answer

The measurements are precise but not accurate.

Question 12

Which of the following measurements contains three significant figures?

Accepted Answer

0.045

Question 13

If you subtract 123.456 from 124.1, what is the answer rounded to the correct number of decimal places?

Accepted Answer

$$0.6$$

Question 14

Which of the following is true about significant figures in multiplication and division?

Accepted Answer

The answer should have the same number of significant figures as the number with the least significant figures.

Question 15

A student measures the volume of a liquid in a graduated cylinder and records 25.0 mL. Which digit is considered uncertain?

Accepted Answer

0

Question 16

Which of the following numbers has only one significant figure?

Accepted Answer

0.003

Question 17

When rounding 121.45 to four significant figures, what is the result?

Accepted Answer

$$121.5$$

Question 18

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

Accepted Answer

Exact numbers limit the number of significant figures reported.

Question 19

A scientist records the mass of a sample as 500.0 g. How many significant figures does this measurement have?

Accepted Answer

Four

Question 20

Which of the following best explains why measurements always have some degree of uncertainty?

Accepted Answer

Because the rightmost digit in a measurement is always estimated.

Significant Figures, Precision, and Accuracy in Measurements

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