Question 1

Which of the following is NOT a fundamental SI unit?

Accepted Answer

Newton

Question 2

A student measures the length of a table as $$2.50 m $$and its width as $$1.20 m. $$What is the correct number of significant figures in the calculated area?

Accepted Answer

2

Question 3

Which of the following equations is dimensionally consistent?

Accepted Answer

$$v = at$$

Question 4

A vector $$	extbf{A}$$ has components $$A_x = 3$$ and $$A_y = 4. $$What is the magnitude of $$	extbf{A}$$?

Accepted Answer

$$5$$

Question 5

Which statement about vector addition is correct?

Accepted Answer

Vectors must be added using both magnitude and direction.

Question 6

If a measurement is reported as $$0.06750 m$$, how many significant figures does it have?

Accepted Answer

5

Question 7

Which of the following is a derived SI unit?

Accepted Answer

Joule

Question 8

A car travels $$123.62 km $$and then $$89 km. $$What is the sum, rounded to the correct number of significant figures?

Accepted Answer

$$213 km$$

Question 9

Which of the following best describes a scalar quantity?

Accepted Answer

A quantity with magnitude only

Question 10

If vector $$	extbf{B}$$ points east and vector $$-	extbf{B} is $$taken, in which direction does $$-	extbf{B}$$ point?

Accepted Answer

West

Question 11

Which of the following is a correct order-of-magnitude estimate for the mass of a car?

Accepted Answer

$$10^3 kg$$

Question 12

A student adds $$2.4 m $$and $$0.042 m. $$What is the sum, rounded to the correct number of significant figures?

Accepted Answer

$$2.4 m$$

Question 13

Which of the following is NOT a rule for significant figures?

Accepted Answer

All zeros are always significant.

Question 14

Which physical quantity is measured in seconds?

Accepted Answer

Time

Question 15

A vector $$	extbf{C}$$ has magnitude $$8$$ and points north. What is the magnitude and direction of $$-	extbf{C}$$?

Accepted Answer

Magnitude $$8$$, direction south

Question 16

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

Accepted Answer

Equations must be dimensionally consistent to be physically meaningful.

Question 17

A measurement is reported as $$0.00420 kg. $$How many significant figures does this value have?

Accepted Answer

3

Question 18

Which of the following is a real-world example of a vector quantity?

Accepted Answer

Velocity of a car driving north at $$60 km/h$$

Question 19

A runner completes a $$400 m $$lap in $$50 s. $$What is the average speed in SI units?

Accepted Answer

$$8 m/s$$

Question 20

Which of the following best describes the difference between scalars and vectors?

Accepted Answer

Scalars have magnitude only; vectors have both magnitude and direction.

Fundamental Concepts in Physics: Physical Quantities, Units, Significant Figures, and Vectors

Guida di studio - Domande di pratica

Study guide - Flashcard