Significant Figures

Question 1

0.0005 has five significant figures.

True or False?

Answer 1

False

Question 2

What is the number of significant digits in the following measurement?
33.10

Answer 2

4

Question 3

The mass of copper is 0.063546 kg and the density is 8.940 g/cm3. Calculate the volume using scientific figures.

Answer 3

7.108cm3

Question 4

89015 has _____ significant digits.

Answer 4

5

Question 5

0.000236 kg has _____ significant figures.

Answer 5

3

Question 6

How many of the zeroes in 0.0079 are significant digits?

Answer 6

0

Question 7

How many significant figures does the measurement 1.50 have?

Answer 7

3

Question 8

Assume that you take a measurement with a metric ruler that is divided into individual millimeters. Which measurement has the correct number of significant figures?

21. 0mm
22. 00mm

Answer 8

21.0mm

Question 9

Express the number 38000 in exponential notation to show four significant figures.

Answer 9

3.800 x 10^4

Question 10

How many significant figures are present in 2.020×10−25 and 5.00×1027 respectively?

Answer 10

4 and 3

Question 11

Which of the following is a correct rule for counting significant figures?
Leading zeroes are always significant.
Trailing zeroes are never significant.
Zeroes that show only where the decimal point falls are not significant.

Answer 11

Zeroes that show only where the decimal point falls are not significant.

Question 12

How many significant figures are in 3.02×108?

Answer 12

3

Question 13

When expressed as 7.5×104, only the significant figures of _____ are to be considered.

Answer 13

7.5

Question 14

Round the number 6845 into three significant figures.

Answer 14

6850

Question 15

The mass of an element is .007502×10−26 g. Find the number of significant figures when the mass is converted to mg. (Both mass values have same order of magnitude)

Answer 15

4

Question 16

When measuring an object’s physical properties, how precise can one’s estimate be?

Answer 16

to the nearest tenth of a mark

Question 17

How many significant figures are there in the measurement 347,000 g?

Answer 17

three

Question 18

New carpet is being measured for a room that is 6.2 m by 8.9 m. On a measuring tape, what is the largest unit that could be used to correctly make these measurements?

Answer 18

decimeters

Question 19

Round the number 1258 into three significant figures.

Answer 19

1260

Question 20

1.05×104g has two significant figures.

True or False?

Answer 20

False

Question 21

A zero that appears in front of all of the nonzero digits is right-end zero.
True or False?

Answer 21

False

Question 22

0.48 has three significant figures.

True or False?

Answer 22

False

Question 23

There are four significant numbers in 70.03.

True or False?

Answer 23

True

Question 24

Considering 20.000 and 0.00002, 20.000 has more significant figures.
True or False?

Answer 24

True

Question 25

Zeroes that occur between other nonzero digits (as in 602.7) are always considered to be significant digits. True or False?

Answer 25

True

Question 26

700. has one significant figure. | True or False?

Answer 26

False

Question 27

There are three significant figures in 1.23 g. | True or False?

Answer 27

True

Question 28

In a properly reported measurement, one or more insignificant digits are reported. True or False?

Answer 28

False

Question 29

An insignificant zero functions as a placeholder for the decimal point. True or False

Answer 29

True