Question 1

Which of the following numbers is correctly written in scientific notation?

Accepted Answer

$4.5 	imes 10^{2}$

Question 2

A scientist measures the mass of a sample as 0.010 g. How many significant figures are in this measurement?

Accepted Answer

3

Question 3

Express the number 0.0000021 in scientific notation.

Accepted Answer

$2.1 	imes 10^{-6}$

Question 4

Which of the following measurements has the greatest precision?

Accepted Answer

2.400 m

Question 5

A graduated cylinder is marked every 0.1 mL. Which measurement below correctly reports the number of significant figures?

Accepted Answer

2.94 mL

Question 6

The population of China in 2017 was approximately 1,387,000,000 people. Express this number in scientific notation.

Accepted Answer

$1.387 	imes 10^{9}$

Question 7

How many significant figures are in the measurement 0.00450 m?

Accepted Answer

3

Question 8

Which of the following best describes the meaning of a negative exponent in scientific notation?

Accepted Answer

Divide by 10 for each negative exponent

Question 9

A scientist reports a temperature increase of $0.7^{\circ}C$. What does this imply about the precision of the measurement?

Accepted Answer

The uncertainty is $\pm 0.1^{\circ}C$

Question 10

Which of the following numbers has an ambiguous number of significant figures?

Accepted Answer

$2100$

Question 11

When rounding 2.349 to two significant figures, what is the correct result?

Accepted Answer

2.4

Question 12

Which of the following statements about leading zeros is correct?

Accepted Answer

Leading zeros are never significant

Question 13

A measurement is recorded as 5.100 g. How many significant figures does this value have?

Accepted Answer

4

Question 14

Which of the following is an example of an exact number with an unlimited number of significant figures?

Accepted Answer

The number of pencils in a box: 10 pencils

Question 15

The Curiosity Rover on Mars measured a daily low temperature of $-65.19^{\circ}C$. What is the implied range of the actual temperature?

Accepted Answer

between $-65.18^{\circ}C$ and $-65.20^{\circ}C$

Question 16

When adding $5.21$ and $0.912$, what is the correct answer with the proper number of decimal places?

Accepted Answer

$6.12$

Question 17

Which of the following measurements is reported with the correct number of significant figures for a balance marked every 0.1 g?

Accepted Answer

1.26 g

Question 18

A ruler is used to measure the diameter of a disk as $4.5 	imes 10^{-2}$ m. What is the value in decimal notation?

Accepted Answer

0.045 m

Question 19

Which of the following is true about trailing zeros in a number with a decimal point?

Accepted Answer

They are always significant

Question 20

If you measure the temperature of a backyard in the shade and obtain a reading of $24.2^{\circ}C$, how many significant figures does this measurement have?

Accepted Answer

3

Chapter 2 Measurement and Problem Solving: Scientific Notation, Significant Figures, and Precision

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