Question 1

Which of the following is NOT a fundamental physical quantity in the International System (SI)?

Accepted Answer

Force

Question 2

If $$d = v t + h$$ and $$[d] = m$$, $$[t] = s$$, what are the units of $$v$$?

Accepted Answer

$$\frac{m}{s}$$

Question 3

A student measures a length as $$2.10\ m$$ and another as $$2.1\ m. $$What is the main difference between these two measurements?

Accepted Answer

The first has more significant figures, indicating higher precision.

Question 4

Which of the following equations is dimensionally consistent?

Accepted Answer

$$d = v t$$

Question 5

Convert $$1\ inch to $$centimeters using the equivalence $$1\ inch = 2.54\ cm. $$How many centimeters are in $$5\ inches$$?

Accepted Answer

$$12.7\ cm$$

Question 6

A car travels $$50\ km. $$Its fuel efficiency is $$22\ miles/gallon$$ and gas costs $$4.00/gallon. If $$you have $$5$$, can you make the trip? (Use $$1\ mile = 1.609\ km)$$

Accepted Answer

No

Question 7

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

Accepted Answer

Kilogram ($$kg)$$

Question 8

What is the percent error if the true value is $$159.87\ km$$ and the measured value is $$159.90\ km$$? (Round to two significant figures)

Accepted Answer

$$0.019\%$$

Question 9

Which statement best describes the purpose of dimensional analysis in physics?

Accepted Answer

To check that equations are physically meaningful by comparing units.

Question 10

Which of the following is a correct unit conversion for mass?

Accepted Answer

$$1\ lb = 0.454\ kg$$

Question 11

Why is it important to carry units through calculations in physics?

Accepted Answer

It ensures dimensional consistency and physical meaning.

Question 12

Which prefix represents $$10^{-2} in $$the SI system?

Accepted Answer

Centi-

Question 13

If an equation is not dimensionally consistent, what does this imply?

Accepted Answer

The equation cannot represent a physical law.

Question 14

Which of the following is a real-world example where significant figures are crucial?

Accepted Answer

Calculating the dosage of medication for a patient.

Question 15

Which of the following is NOT a correct SI unit?

Accepted Answer

Pound ($$lb)$$

Question 16

A bridge collapses due to a minor calculation error. What does this scenario illustrate about physics calculations?

Accepted Answer

Precision and accuracy are critical in real-world applications.

Question 17

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

Accepted Answer

$$M L T$$^{-2}$$

Question 18

If you add $$2.105\ m$$ and $$2.098\ m$$, how many significant figures should the result have?

Accepted Answer

Three

Question 19

Which of the following is a correct conversion for $$0.454\ kg to $$grams?

Accepted Answer

$$0.454 	imes 10^3$\ g$$

Question 20

Why is it important to approximate reality with the simplest model possible in physics?

Accepted Answer

It makes predictions easier and more reliable if the approximation is valid.

Introduction to Physics: Units, Physical Quantities, and Measurement

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