Question 1

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

Accepted Answer

Area

Question 2

A car travels at a speed of $$38.0\ \mathrm{m/s}. Is $$the driver exceeding the speed limit of $$75.0\ \mathrm{mi/h}$$? Use $$1\ \mathrm{mi} = 1609\ \mathrm{m}.$$

Accepted Answer

Yes, the driver is exceeding the speed limit.

Question 3

Which of the following best describes a physical property?

Accepted Answer

A property that is measurable and describes a state of a physical system.

Question 4

What is the dimension of acceleration in terms of $$L$$, $$M$$, and $$T$$?

Accepted Answer

$$L/T^2$$

Question 5

If you multiply $$25.57\ \mathrm{m} by$$ $$2.45\ \mathrm{m}$$, how many significant figures should your answer have?

Accepted Answer

3

Question 6

Which of the following conversion factors is correct?

Accepted Answer

$$1\ \mathrm{ft} = 0.3048\ \mathrm{m}$$

Question 7

A measurement is reported as $$1.234 	imes 10$$^{-4}$$. How many significant figures does it have?

Accepted Answer

4

Question 8

Which of the following statements about dimensional analysis is correct?

Accepted Answer

An equation is only correct if the dimensions on both sides are the same.

Question 9

When adding $$135\ \mathrm{m}$$ and $$3.25\ \mathrm{m}$$, what should be the result according to the rules of significant figures?

Accepted Answer

$$138\ \mathrm{m}$$

Question 10

Which SI base unit is used to measure luminous intensity?

Accepted Answer

Candela

Question 11

A student measures the mass of an object as $$1000\ \mathrm{g}. $$How many significant figures does this measurement have?

Accepted Answer

1

Question 12

Which of the following is a correct order-of-magnitude estimate for $$0.0086\ \mathrm{m}$$?

Accepted Answer

$$10^{-2}$$\ \mathrm{m}$$

Question 13

Which of the following is NOT a criterion for the measurement of a property?

Accepted Answer

Color

Question 14

A distance of $$100\ \mathrm{mi} is to be $$converted to kilometers. Which of the following is true?

Accepted Answer

The number of kilometers is larger than 100.

Question 15

Which of the following best describes the concept of 'significant figures'?

Accepted Answer

Digits in a number that carry meaning contributing to its precision.

Question 16

Which of the following derived quantities has the dimension $$L^2$$?

Accepted Answer

Area

Question 17

A measurement is reported as $$0.000123. $$How many significant figures does it have?

Accepted Answer

3

Question 18

Which of the following is the correct dimension for speed?

Accepted Answer

$$L/T$$

Question 19

Which SI base unit is used to measure thermodynamic temperature?

Accepted Answer

Kelvin

Question 20

When multiplying or dividing measured quantities, the number of significant figures in the final answer should be:

Accepted Answer

The same as the quantity with the smallest number of significant figures.

Physics and Measurement: SI Units, Dimensional Analysis, and Significant Figures

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