Question 1

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

Accepted Answer

Newton (N)

Question 2

A car travels 120 kilometers in 2 hours. What is its average speed in meters per second (m/s)?

Accepted Answer

$$16.7\ \mathrm{m/s}$$

Question 3

Which of the following statements about dimensional analysis is correct?

Accepted Answer

It can be used to check if an equation is dimensionally consistent.

Question 4

You are given the equation $$x = vt. $$What are the dimensions of $$x$$?

Accepted Answer

$$[L]$$

Question 5

A student wants to convert 5280 feet to meters. Which conversion factor should they use?

Accepted Answer

$$1\ \mathrm{m} = 3.281\ \mathrm{ft}$$

Question 6

Which of the following is a scalar quantity?

Accepted Answer

Temperature

Question 7

How many significant figures are in the number $$0.003040$$?

Accepted Answer

4

Question 8

Which of the following equations is NOT dimensionally consistent?

Accepted Answer

$$x = vt^2$

Question 9

A measurement is recorded as $$2.40 	imes 10^3$. How many significant figures does it have?

Accepted Answer

3

Question 10

Which of the following best describes a vector quantity?

Accepted Answer

A quantity that has both magnitude and direction

Question 11

If you convert 9780 meters to feet using the conversion factor $$1\ \mathrm{m} = 3.281\ \mathrm{ft}$$, what is the result?

Accepted Answer

$$32,090\ \mathrm{ft}$$

Question 12

Which of the following is NOT a base unit in the SI system?

Accepted Answer

Newton (N)

Question 13

A runner completes a 400 m lap in 50 seconds. What is their average speed in $$\mathrm{m/s}$$?

Accepted Answer

$$4.0\ \mathrm{m/s}$$

Question 14

Which of the following is a correct statement about significant figures?

Accepted Answer

Zeros between two significant digits are significant.

Question 15

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

Accepted Answer

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

Question 16

A student writes the equation $$x = vt^2$. Using dimensional analysis, what is the dimension of the right side?

Accepted Answer

$$[L][T]^2$$

Question 17

Which of the following is a correct step in the problem-solving strategy outlined in the study materials?

Accepted Answer

Sketch a picture and write out the knowns and unknowns.

Question 18

Which of the following is a correct conversion for $$1\ \mathrm{kg} to $$grams?

Accepted Answer

$$1\ \mathrm{kg} = 1000\ \mathrm{g}$$

Question 19

Which of the following is an example of a vector quantity?

Accepted Answer

Displacement

Question 20

Why is it important to use the correct number of significant figures in scientific measurements?

Accepted Answer

It reflects the precision of the measurement and avoids overstating accuracy.

Fundamental Concepts in Physics: Units, Dimensional Analysis, Significant Figures, Scalars & Vectors, and Problem Solving

Guida di studio - Domande di pratica