Q: A scientist needs to convert $$2.5$$ hours to seconds. Which conversion factors should be used?

$$1 \text{ hour} = 60 \text{ minutes}$$ and $$1 \text{ minute} = 60 \text{ seconds}$$

Q: Which of the following conversions is correct using dimensional analysis?

$$1 \text{ km} = 1000 \text{ m}$$

Question 1

Which of the following is the correct SI base unit for measuring electric current?

Accepted Answer

ampere (A)

Question 2

A laboratory thermometer measures the boiling point of water as $$98^\circ C$$ when the true value is $$100^\circ C. $$What is the percent error of this measurement? Use the formula $$	ext{Percent Error} = \frac{\left| 	ext{measured value} - 	ext{true value} ight|}{	ext{true value}} 	imes 100\%.$$

Accepted Answer

$$2\%$$

Question 3

Which prefix represents a factor of $$10^{-6} in $$the metric system?

Accepted Answer

micro

Question 4

Convert $$5.2 	imes 10^3$ grams to kilograms using dimensional analysis.

Accepted Answer

$$5.2 kg$$

Question 5

Which of the following quantities is NOT an SI base quantity?

Accepted Answer

Volume

Question 6

A student records a measurement as $$0.00450$$ meters. How many significant figures does this value have?

Accepted Answer

3

Question 7

Which of the following best describes dimensional analysis?

Accepted Answer

A technique for converting one unit to another using conversion factors

Question 8

Express $$0.00032$$ meters in scientific notation.

Accepted Answer

$$3.2 	imes 10$$^{-4}$$ m

Question 9

If a measurement is recorded as $$7.00 	imes 10^2$ seconds, how many significant figures does it have?

Accepted Answer

3

Question 10

A car travels $$150$$ kilometers. Express this distance in meters using the correct conversion factor.

Accepted Answer

$$1.5 	imes 10^5$ m

Question 11

Which of the following is the correct symbol for the SI base unit of temperature?

Accepted Answer

K

Question 12

A scientist needs to convert $$2.5$$ hours to seconds. Which conversion factors should be used?

Accepted Answer

$$1 	ext{ hour} = 60 	ext{ minutes}$$ and $$1 	ext{ minute} = 60 	ext{ seconds}$$

Question 13

Which of the following is the correct scientific notation for $$4,500,000$$?

Accepted Answer

$$4.5 	imes 10^6$

Question 14

A sample has a mass of $$0.025$$ kilograms. How many milligrams is this?

Accepted Answer

$$2.5 	imes 10^4$ mg

Question 15

Which of the following is a correct statement about the SI system?

Accepted Answer

It is based on multiples of ten.

Question 16

A measurement is recorded as $$3.00 	imes 10$$^{-2}$$ meters. Which of the following best describes the number of significant figures?

Accepted Answer

3

Question 17

Which of the following conversions is correct using dimensional analysis?

Accepted Answer

$$1 	ext{ km} = 1000 	ext{ m}$$

Question 18

A scientist measures a length as $$2.56$$ meters, but the true value is $$2.60$$ meters. What is the percent error?

Accepted Answer

$$1.54\%$$

Question 19

Which SI prefix would you use to express $$10^9$$ times a base unit?

Accepted Answer

giga

Question 20

A medical test result is reported as $$4.2 	imes 10$$^{-3}$$ grams. How many micrograms is this?

Accepted Answer

$$4.2 	imes 10^3$ \mu g

Models, Measurements, and Vectors: SI Units, Scientific Notation, and Measurement Accuracy

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