Q: Which of the following is a correct conversion using the 'magic of 1' method: Convert $$10 \ \mathrm{m} to $$centimeters?

$$10 \ \mathrm{m} \times \frac{100 \ \mathrm{cm}}{1 \ \mathrm{m}} = 1000 \ \mathrm{cm}$$

Question 1

Which of the following is NOT one of the four fundamental forces studied in physics?

Accepted Answer

Friction

Question 2

A measurement is recorded as $$X = 12.34 \ \mathrm{cm} \pm 0.02 \ \mathrm{cm}. $$What does the $$\pm 0.02 \ \mathrm{cm}$$ represent?

Accepted Answer

The uncertainty in the measurement

Question 3

Which of the following quantities is expressed with the correct number of significant figures after multiplication: $$4.56 	imes 1.4$$?

Accepted Answer

$$6.4$$

Question 4

A student measures the length of a table as $$2.50 \ \mathrm{m}$$ and the width as $$1.2 \ \mathrm{m}. $$What is the area, with the correct number of significant figures?

Accepted Answer

$$3.0 \ \mathrm{m}^2$$

Question 5

Which of the following is the correct SI unit for mass?

Accepted Answer

Kilogram

Question 6

The prefix 'milli-' in the metric system means:

Accepted Answer

$$10^{-3}$$

Question 7

Which of the following is a correct statement about adding or subtracting physical quantities?

Accepted Answer

You can only add or subtract quantities with the same dimensions.

Question 8

A patient receives a CAT scan. Which subfield of physics is most directly involved in the technology behind this medical application?

Accepted Answer

Nuclear Physics

Question 9

Convert $$5.0 \ \mathrm{in} 	imes 3.0 \ \mathrm{in} to$$ $$\mathrm{cm}^2$$ using $$1 \ \mathrm{in} = 2.54 \ \mathrm{cm}.$$

Accepted Answer

$$38 \ \mathrm{cm}^2$$

Question 10

Which of the following best describes an order of magnitude estimate?

Accepted Answer

A rough estimate, usually within a factor of 10

Question 11

A measurement is recorded as $$0.00340. $$How many significant figures does this value have?

Accepted Answer

3

Question 12

Which of the following is the correct definition of a meter in the SI system?

Accepted Answer

The distance light travels in $$1/299,792,458 of a $$second

Question 13

A scientist records a value as $$8.00 	imes 10^2$. How many significant figures does this value have?

Accepted Answer

3

Question 14

Which of the following is the best reason for including units in all answers to physics problems?

Accepted Answer

Units help ensure the answer is physically meaningful.

Question 15

A ruler is used to measure the length of a board as shown in the image. If the measurement reads $$8.8 \ \mathrm{cm}$$, what is the uncertainty if the smallest division is $$0.1 \ \mathrm{cm}$$?

Accepted Answer

$$\pm 0.1 \ \mathrm{cm}$$

Question 16

Which of the following is a correct conversion using the 'magic of 1' method: Convert $$10 \ \mathrm{m} to $$centimeters?

Accepted Answer

$$10 \ \mathrm{m} 	imes \frac{100 \ \mathrm{cm}}{1 \ \mathrm{m}} = 1000 \ \mathrm{cm}$$

Question 17

Which of the following is a correct statement about significant figures in addition and subtraction?

Accepted Answer

The result should have as many decimal places as the number with the least decimal places.

Question 18

Which of the following is a real-world application of physics in medicine?

Accepted Answer

MRI scans

Question 19

A calculation yields $$23.66 	imes 1.1 = 26.026. $$What is the correct way to report this result using significant figures?

Accepted Answer

$$26$$

Question 20

Which of the following is the correct definition of the unified atomic mass unit ($$1 \ \mathrm{u}$$)?

Accepted Answer

1/12 the mass of a $$^{12}\mathrm{C}$$ atom

Unit 1: Units and Measurements – Foundations of Physics with Algebra

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