Q: Which of the following is the correct scientific notation for the radius of the Earth at the equator, $$6,380,000\ \mathrm{m}$$?

$$6.38 \times 10^6$\ \mathrm{m}$$

Q: Which of the following is the correct value for the speed of light in SI units?

$$3.00 \times 10^8$\ \mathrm{m/s}$$

Question 1

Which of the following is a derived SI unit?

Accepted Answer

meter per second (m/s)

Question 2

A laboratory scale measures a mass as 0.1500 kg. How many significant figures does this measurement have?

Accepted Answer

4

Question 3

The density of water is $$1\ \mathrm{g/cm^3$}. $$What is this value in SI units?

Accepted Answer

$$1000\ \mathrm{kg/m^3$}$$

Question 4

Which of the following is the correct scientific notation for the radius of the Earth at the equator, $$6,380,000\ \mathrm{m}$$?

Accepted Answer

$$6.38 	imes 10^6$\ \mathrm{m}$$

Question 5

A gold bar has a volume of $$129.5\ \mathrm{cm^3$}$$ and a density of $$19.3\ \mathrm{g/cm^3$}. $$What is its mass in kilograms?

Accepted Answer

$$2.50\ \mathrm{kg}$$

Question 6

Which SI prefix corresponds to a factor of $$10^{-6}$$?

Accepted Answer

micro

Question 7

A car travels at $$10\ \mathrm{m/s}. $$What is its speed in $$\mathrm{km/h}$$?

Accepted Answer

$$36\ \mathrm{km/h}$$

Question 8

Which of the following equations is dimensionally consistent for the period $$T of a $$pendulum of length $$L in a $$gravitational field $$g$$?

Accepted Answer

$$T = 2\pi \sqrt{L/g}$$

Question 9

Which of the following is NOT a fundamental SI unit?

Accepted Answer

newton (N)

Question 10

A measurement is recorded as $$0.003125\ \mathrm{ms}. $$How many significant figures does this value have?

Accepted Answer

4

Question 11

Which of the following best describes the difference between mass and weight?

Accepted Answer

Weight is the force of gravity on an object; mass is the amount of matter in an object.

Question 12

Which of the following conversion factors would you use to convert $$53.75$$ feet to inches?

Accepted Answer

$$\frac{12\ \mathrm{in}}{1\ \mathrm{ft}}$$

Question 13

A briefcase has inner dimensions $$46.0\ \mathrm{cm} 	imes 29.6\ \mathrm{cm} 	imes 10.5\ \mathrm{cm}. $$What is its volume in $$\mathrm{cm^3$}$$?

Accepted Answer

$$14232\ \mathrm{cm^3$}$$

Question 14

Which of the following statements about significant figures is correct?

Accepted Answer

Trailing zeros after a decimal point are significant.

Question 15

If a measurement is $$8.25\ \mathrm{m}$$, how many significant figures does it have?

Accepted Answer

3

Question 16

Which of the following is the correct dimensional formula for acceleration?

Accepted Answer

$$[L T$$^{-2}$$]$$

Question 17

A student adds $$27153$$ and $$132$$ and subtracts $$1174. $$What is the correct answer with the proper number of significant figures?

Accepted Answer

$$1536$$

Question 18

Which of the following is a correct statement about dimensional analysis?

Accepted Answer

The two sides of an equation must have the same dimensions.

Question 19

The period of a pendulum is given by $$T = 2\pi \sqrt{L/g}. If$$ $$L is $$measured in meters and $$g in$$ $$\mathrm{m/s^2$}$$, what is the unit of $$T$$?

Accepted Answer

$$\mathrm{s}$$

Question 20

Which of the following is the correct value for the speed of light in SI units?

Accepted Answer

$$3.00 	imes 10^8$\ \mathrm{m/s}$$

Measurements and Units in Physics: Foundations, Conversions, and Precision

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