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Introductory Physics Units and Quantities
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1
Question
What is Physics?
Answer
A science of matter, energy, and their interactions.
2
Question
What is a physical quantity?
Answer
Measurable quantity with magnitude and unit.
3
Question
What are base quantities?
Answer
Fundamental quantities from which others are derived.
4
Question
Name the seven base quantities.
Answer
Length, Mass, Time, Temperature, Electric current, Amount of substance, Luminous intensity.
5
Question
What is the SI unit for length?
Answer
Meter (m).
6
Question
What is the SI unit for mass?
Answer
Kilogram (kg).
7
Question
What is the SI unit for time?
Answer
Second (s).
8
Question
What is the SI unit for temperature?
Answer
Kelvin (K).
9
Question
What is the SI unit for electric current?
Answer
Ampere (A).
10
Question
What is the SI unit for amount of substance?
Answer
Mole (mol).
11
Question
What is the SI unit for luminous intensity?
Answer
Candela (cd).
12
Question
What is the SI unit for force?
Answer
Newton (N).
13
Question
What is the SI unit for energy?
Answer
Joule (J).
14
Question
What is the SI unit for density?
Answer
Kilogram per cubic meter (kg/m³).
15
Question
What is the difference between base and derived quantities?
Answer
Base quantities form the foundation; derived quantities are expressed from base ones.
16
Question
What is meant by scalar and vector quantities?
Answer
Scalars have magnitude only; vectors have magnitude and direction.
17
Question
Give an example of a derived quantity.
Answer
Speed (m/s) or Force (N).
18
Question
What is meant by measurement error?
Answer
Difference between measured value and true value.
19
Question
What is the relationship between energy and units as listed?
Answer
Energy uses the joule (J) as its unit.
20
Question
What is a derived quantity?
Answer
A quantity calculated from base quantities
21
Question
Give three examples of derived quantities.
Answer
Area, Volume, Speed
22
Question
What is the SI unit for length?
Answer
Meter (m)
23
Question
What is the SI unit for mass?
Answer
Kilogram (kg)
24
Question
What is the SI unit for time?
Answer
Second (s)
25
Question
What is the SI unit for temperature?
Answer
Kelvin (K)
26
Question
What is the SI unit for electric current?
Answer
Ampere (A)
27
Question
What is the SI unit for amount of substance?
Answer
Mole (mol)
28
Question
What is the SI unit for luminous intensity?
Answer
Candela (cd)
29
Question
Define speed as a derived quantity.
Answer
Distance divided by time (Speed = distance/time)
30
Question
What is area a derived quantity of?
Answer
Length x Width (or base vectors) → m²