Question 1

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

Accepted Answer

Force (F)

Question 2

A student writes the equation $$d = vt + h$$, where $$[d] = m$$ and $$[t] = s. $$What are the units of $$h$$ for the equation to be dimensionally consistent?

Accepted Answer

$$m$$

Question 3

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

Accepted Answer

To check that all terms in an equation have the same units

Question 4

If $$1$$ inch $$= 2.54 cm$$, how many meters are in $$10$$ inches?

Accepted Answer

$$0.254 m$$

Question 5

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

Accepted Answer

No, you do not have enough money for gas.

Question 6

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

Accepted Answer

Newton (N)

Question 7

A measurement is recorded as $$2.10 m. $$How many significant figures does this value have?

Accepted Answer

Three

Question 8

The distance between two train stations is $$159.87 km. A $$train travels $$159.90 km. $$What is the percent error (rounded to two significant figures)?

Accepted Answer

$$0.019\%$$

Question 9

Which of the following is a correct statement about the scientific method as discussed in the course?

Accepted Answer

It relies on observation and experiments to understand nature.

Question 10

Why is it important to keep units throughout calculations in physics?

Accepted Answer

To ensure that the final answer is dimensionally correct and meaningful.

Question 11

Which of the following is the correct conversion for $$1 lb to $$kilograms?

Accepted Answer

$$1 lb$$ $$= 0.454 kg$$

Question 12

Which of the following best describes the role of approximation in physics modeling?

Accepted Answer

To simplify complex reality with the simplest model possible.

Question 13

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

Accepted Answer

$$m/s$$

Question 14

Which of the following is a derived unit in the SI system?

Accepted Answer

Newton (N)

Question 15

A bridge is designed using a model that ignores air resistance. This is an example of:

Accepted Answer

Approximating reality with a simple model

Question 16

Which of the following is the correct SI prefix for $$10^{-3}$$?

Accepted Answer

Milli-

Question 17

Why is it important to use significant figures in reporting measurements?

Accepted Answer

To reflect the precision of the measurement instrument.

Question 18

Which of the following is a real-world consequence of a minor calculation error in physics, as discussed in class?

Accepted Answer

A bridge could collapse.

Question 19

Which of the following is the correct conversion for $$2.54 cm to $$meters?

Accepted Answer

$$2.54 	imes 10$$^{-2}$$ m

Question 20

Which of the following is a key reason why physics is at the core of all natural sciences, technology, and engineering?

Accepted Answer

It provides models to predict where things will be and why.

Introduction to Units, Physical Quantities, and Dimensional Analysis in Physics

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