SI Units Flashcards: 7 Base Units & 22 Named Derived Units
Practice all 7 SI base units and 22 derived units with special names: quantities, symbols, and base-unit expressions in one installable deck.
За това тесте
Most SI lists are easy to scan and awkward to recall. These 110 text-only cards turn the complete core into small retrieval tasks: all seven base units and all 22 derived units with special names and symbols.
What the cards practice
-
Quantity ↔ unit and symbol: recall each base quantity and every named derived quantity in both directions.
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Named unit ↔ coherent base-unit expression: expand all 22 special names, then reverse the mapping with the quantity supplied whenever an expression is shared.
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Notation and distinctions: keep case, spacing, symbol grammar, Hz/Bq, Gy/Sv, rad/sr, and kelvin/degree Celsius intervals straight.
The deck leaves out prefixes, conversions, non-SI units, unnamed derived units, significant figures, uncertainty, laboratory procedures, historical definitions, defining-constant values, and proprietary exam material. Expression-to-unit prompts always state the quantity, so shared expressions such as s⁻¹ and m²·s⁻² stay unambiguous.
The sequence establishes the seven base units first. It then alternates the 22 named units with a deterministic stride before moving from identity recall to base-unit expressions. Related directions and easy-to-confuse units stay at least three unrelated cards apart; the review scheduler handles longer-term spacing after installation.
Facts were checked against the BIPM SI Brochure, 9th edition, version 4.01 and NIST SP 330 §2, with notation checked against NIST SP 330 §5. The 2026 BIPM edition expresses radian and steradian as unit one; this deck follows that current form. No source prose, third-party deck text, or exam content was copied.
An AI tool helped draft and sequence the cards and generated the cover. Every final front and back was manually checked against the official SI tables. The original questions, answers, selection, sequence, metadata, and cover are shared under CC0 1.0 to the extent those elements can be dedicated; the underlying SI facts remain common knowledge.
Карти в това тесте
Карта 1
Въпрос
What is the SI base unit for time?
Отговор
second (s).
Карта 2
Въпрос
What is the SI base unit for length?
Отговор
metre (m).
Карта 3
Въпрос
What is the SI base unit for mass?
Отговор
kilogram (kg).
Карта 4
Въпрос
What is the SI base unit for electric current?
Отговор
ampere (A).
Карта 5
Въпрос
What is the SI base unit for thermodynamic temperature?
Отговор
kelvin (K).
Карта 6
Въпрос
What is the SI base unit for amount of substance?
Отговор
mole (mol).
Карта 7
Въпрос
What is the SI base unit for luminous intensity?
Отговор
candela (cd).
Карта 8
Въпрос
Which SI base quantity uses the second (s)?
Отговор
Time.
Карта 9
Въпрос
Which SI base quantity uses the metre (m)?
Отговор
Length.
Карта 10
Въпрос
Which SI base quantity uses the kilogram (kg)?
Отговор
Mass.
Карта 11
Въпрос
Which SI base quantity uses the ampere (A)?
Отговор
Electric current.
Карта 12
Въпрос
Which SI base quantity uses the kelvin (K)?
Отговор
Thermodynamic temperature.
Карта 13
Въпрос
Which SI base quantity uses the mole (mol)?
Отговор
Amount of substance.
Карта 14
Въпрос
Which SI base quantity uses the candela (cd)?
Отговор
Luminous intensity.
Карта 15
Въпрос
Which SI unit with a special name is used for plane angle?
Отговор
radian (rad).
Карта 16
Въпрос
Which SI unit with a special name is used for energy, work, or amount of heat?
Отговор
joule (J).
Карта 17
Въпрос
Which SI unit with a special name is used for electric resistance?
Отговор
ohm (Ω).
Карта 18
Въпрос
Which SI unit with a special name is used for Celsius temperature?
Отговор
degree Celsius (°C).
Карта 19
Въпрос
Which SI unit with a special name is used for dose equivalent?
Отговор
sievert (Sv).
Карта 20
Въпрос
Which SI unit with a special name is used for force?
Отговор
newton (N).
Карта 21
Въпрос
Which SI unit with a special name is used for electric potential difference?
Отговор
volt (V).
Карта 22
Въпрос
Which SI unit with a special name is used for magnetic flux density?
Отговор
tesla (T).
Карта 23
Въпрос
Which SI unit with a special name is used for activity referred to a radionuclide?
Отговор
becquerel (Bq).
Карта 24
Въпрос
Which SI unit with a special name is used for solid angle?
Отговор
steradian (sr).
Карта 25
Въпрос
Which SI unit with a special name is used for power or radiant flux?
Отговор
watt (W).
Карта 26
Въпрос
Which SI unit with a special name is used for electric conductance?
Отговор
siemens (S).
Карта 27
Въпрос
Which SI unit with a special name is used for luminous flux?
Отговор
lumen (lm).
Карта 28
Въпрос
Which SI unit with a special name is used for catalytic activity?
Отговор
katal (kat).
Карта 29
Въпрос
Which SI unit with a special name is used for pressure or stress?
Отговор
pascal (Pa).
Карта 30
Въпрос
Which SI unit with a special name is used for capacitance?
Отговор
farad (F).
Карта 31
Въпрос
Which SI unit with a special name is used for inductance?
Отговор
henry (H).
Карта 32
Въпрос
Which SI unit with a special name is used for absorbed dose or kerma?
Отговор
gray (Gy).
Карта 33
Въпрос
Which SI unit with a special name is used for frequency?
Отговор
hertz (Hz).
Карта 34
Въпрос
Which SI unit with a special name is used for electric charge?
Отговор
coulomb (C).
Карта 35
Въпрос
Which SI unit with a special name is used for magnetic flux?
Отговор
weber (Wb).
Карта 36
Въпрос
Which SI unit with a special name is used for illuminance?
Отговор
lux (lx).
Карта 37
Въпрос
What quantity uses the radian (rad)?
Отговор
Plane angle.
Карта 38
Въпрос
What quantity uses the joule (J)?
Отговор
Energy, work, and amount of heat.
Карта 39
Въпрос
What quantity uses the ohm (Ω)?
Отговор
Electric resistance.
Карта 40
Въпрос
What quantity uses the degree Celsius (°C)?
Отговор
Celsius temperature.
Карта 41
Въпрос
What quantity uses the sievert (Sv)?
Отговор
Dose equivalent.
Карта 42
Въпрос
What quantity uses the newton (N)?
Отговор
Force.
Карта 43
Въпрос
What quantity uses the volt (V)?
Отговор
Electric potential difference.
Карта 44
Въпрос
What quantity uses the tesla (T)?
Отговор
Magnetic flux density.
Карта 45
Въпрос
What quantity uses the becquerel (Bq)?
Отговор
Activity referred to a radionuclide.
Карта 46
Въпрос
What quantity uses the steradian (sr)?
Отговор
Solid angle.
Карта 47
Въпрос
What quantity uses the watt (W)?
Отговор
Power and radiant flux.
Карта 48
Въпрос
What quantity uses the siemens (S)?
Отговор
Electric conductance.
Карта 49
Въпрос
What quantity uses the lumen (lm)?
Отговор
Luminous flux.
Карта 50
Въпрос
What quantity uses the katal (kat)?
Отговор
Catalytic activity.
Карта 51
Въпрос
What quantity uses the pascal (Pa)?
Отговор
Pressure and stress.
Карта 52
Въпрос
What quantity uses the farad (F)?
Отговор
Capacitance.
Карта 53
Въпрос
What quantity uses the henry (H)?
Отговор
Inductance.
Карта 54
Въпрос
What quantity uses the gray (Gy)?
Отговор
Absorbed dose and kerma.
Карта 55
Въпрос
What quantity uses the hertz (Hz)?
Отговор
Frequency.
110 карти
SI Units Flashcards: 7 Base Units & 22 Named Derived Units
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Карта 56
Въпрос
What quantity uses the coulomb (C)?
Отговор
Electric charge.
Карта 57
Въпрос
What quantity uses the weber (Wb)?
Отговор
Magnetic flux.
Карта 58
Въпрос
What quantity uses the lux (lx)?
Отговор
Illuminance.
Карта 59
Въпрос
Express the radian (rad) in coherent SI base units.
Отговор
1. The symbol rad keeps the plane-angle context explicit.
Карта 60
Въпрос
Express the joule (J) in coherent SI base units.
Отговор
kg·m²·s⁻².
Карта 61
Въпрос
Express the ohm (Ω) in coherent SI base units.
Отговор
kg·m²·s⁻³·A⁻².
Карта 62
Въпрос
Express the degree Celsius (°C) in coherent SI base units.
Отговор
K. A degree Celsius and a kelvin have the same size; their zero points differ.
Карта 63
Въпрос
Express the sievert (Sv) in coherent SI base units.
Отговор
m²·s⁻².
Карта 64
Въпрос
Express the newton (N) in coherent SI base units.
Отговор
kg·m·s⁻².
Карта 65
Въпрос
Express the volt (V) in coherent SI base units.
Отговор
kg·m²·s⁻³·A⁻¹.
Карта 66
Въпрос
Express the tesla (T) in coherent SI base units.
Отговор
kg·s⁻²·A⁻¹.
Карта 67
Въпрос
Express the becquerel (Bq) in coherent SI base units.
Отговор
s⁻¹. Use Bq for stochastic nuclear transformations, not periodic phenomena.
Карта 68
Въпрос
Express the steradian (sr) in coherent SI base units.
Отговор
1. The symbol sr keeps the solid-angle context explicit.
Карта 69
Въпрос
Express the watt (W) in coherent SI base units.
Отговор
kg·m²·s⁻³.
Карта 70
Въпрос
Express the siemens (S) in coherent SI base units.
Отговор
kg⁻¹·m⁻²·s³·A².
Карта 71
Въпрос
Express the lumen (lm) in coherent SI base units.
Отговор
cd·sr. Since sr has unit one, this is dimensionally cd; sr keeps the solid-angle context explicit.
Карта 72
Въпрос
Express the katal (kat) in coherent SI base units.
Отговор
mol·s⁻¹.
Карта 73
Въпрос
Express the pascal (Pa) in coherent SI base units.
Отговор
kg·m⁻¹·s⁻².
Карта 74
Въпрос
Express the farad (F) in coherent SI base units.
Отговор
kg⁻¹·m⁻²·s⁴·A².
Карта 75
Въпрос
Express the henry (H) in coherent SI base units.
Отговор
kg·m²·s⁻²·A⁻².
Карта 76
Въпрос
Express the gray (Gy) in coherent SI base units.
Отговор
m²·s⁻².
Карта 77
Въпрос
Express the hertz (Hz) in coherent SI base units.
Отговор
s⁻¹. Use Hz for periodic phenomena.
Карта 78
Въпрос
Express the coulomb (C) in coherent SI base units.
Отговор
A·s.
Карта 79
Въпрос
Express the weber (Wb) in coherent SI base units.
Отговор
kg·m²·s⁻²·A⁻¹.
Карта 80
Въпрос
Express the lux (lx) in coherent SI base units.
Отговор
cd·sr·m⁻². Since sr has unit one, this is dimensionally cd·m⁻²; sr keeps the solid-angle context explicit.
Карта 81
Въпрос
For plane angle, which named SI unit has the coherent base-unit expression 1?
Отговор
radian (rad).
Карта 82
Въпрос
For energy, work, or amount of heat, which named SI unit has the coherent base-unit expression kg·m²·s⁻²?
Отговор
joule (J).
Карта 83
Въпрос
For electric resistance, which named SI unit has the coherent base-unit expression kg·m²·s⁻³·A⁻²?
Отговор
ohm (Ω).
Карта 84
Въпрос
For Celsius temperature, which named SI unit has the coherent base-unit expression K?
Отговор
degree Celsius (°C).
Карта 85
Въпрос
For dose equivalent, which named SI unit has the coherent base-unit expression m²·s⁻²?
Отговор
sievert (Sv).
Карта 86
Въпрос
For force, which named SI unit has the coherent base-unit expression kg·m·s⁻²?
Отговор
newton (N).
Карта 87
Въпрос
For electric potential difference, which named SI unit has the coherent base-unit expression kg·m²·s⁻³·A⁻¹?
Отговор
volt (V).
Карта 88
Въпрос
For magnetic flux density, which named SI unit has the coherent base-unit expression kg·s⁻²·A⁻¹?
Отговор
tesla (T).
Карта 89
Въпрос
For activity referred to a radionuclide, which named SI unit has the coherent base-unit expression s⁻¹?
Отговор
becquerel (Bq).
Карта 90
Въпрос
For solid angle, which named SI unit has the coherent base-unit expression 1?
Отговор
steradian (sr).
Карта 91
Въпрос
For power or radiant flux, which named SI unit has the coherent base-unit expression kg·m²·s⁻³?
Отговор
watt (W).
Карта 92
Въпрос
For electric conductance, which named SI unit has the coherent base-unit expression kg⁻¹·m⁻²·s³·A²?
Отговор
siemens (S).
Карта 93
Въпрос
For luminous flux, which named SI unit has the coherent base-unit expression cd·sr?
Отговор
lumen (lm).
Карта 94
Въпрос
For catalytic activity, which named SI unit has the coherent base-unit expression mol·s⁻¹?
Отговор
katal (kat).
Карта 95
Въпрос
For pressure or stress, which named SI unit has the coherent base-unit expression kg·m⁻¹·s⁻²?
Отговор
pascal (Pa).
Карта 96
Въпрос
For capacitance, which named SI unit has the coherent base-unit expression kg⁻¹·m⁻²·s⁴·A²?
Отговор
farad (F).
Карта 97
Въпрос
For inductance, which named SI unit has the coherent base-unit expression kg·m²·s⁻²·A⁻²?
Отговор
henry (H).
Карта 98
Въпрос
For absorbed dose or kerma, which named SI unit has the coherent base-unit expression m²·s⁻²?
Отговор
gray (Gy).
Карта 99
Въпрос
For frequency, which named SI unit has the coherent base-unit expression s⁻¹?
Отговор
hertz (Hz).
Карта 100
Въпрос
For electric charge, which named SI unit has the coherent base-unit expression A·s?
Отговор
coulomb (C).
Карта 101
Въпрос
For magnetic flux, which named SI unit has the coherent base-unit expression kg·m²·s⁻²·A⁻¹?
Отговор
weber (Wb).
Карта 102
Въпрос
For illuminance, which named SI unit has the coherent base-unit expression cd·sr·m⁻²?
Отговор
lux (lx).
Карта 103
Въпрос
How are SI unit names capitalized in English?
Отговор
They normally start with a lowercase letter, even when named after a person. Within this deck, the proper-name modifier in degree Celsius keeps its capital C.
Карта 104
Въпрос
What determines capitalization in an SI unit symbol?
Отговор
Symbols derived from proper names start with a capital letter; the others are lowercase. Case is mandatory and meaningful.
Карта 105
Въпрос
How do SI unit symbols behave in plurals and at sentence endings?
Отговор
They never take a plural ending, and they take no period unless the symbol ends a sentence. Unit symbols are mathematical symbols, not abbreviations.
Карта 106
Въпрос
How should a number and an SI unit symbol be spaced?
Отговор
Put a space between them: 25 m and 20 °C. In °C, the degree sign and C stay together.
Карта 107
Въпрос
Both hertz and becquerel reduce to s⁻¹. When is each used?
Отговор
Use hertz (Hz) for periodic phenomena and becquerel (Bq) for activity referred to a radionuclide. The shared expression doesn't make the quantities interchangeable.
Карта 108
Въпрос
Both gray and sievert reduce to m²·s⁻². What distinguishes them?
Отговор
Gray (Gy) is used for absorbed dose or kerma; sievert (Sv) is used for dose equivalent. The quantity context determines the special name.
Карта 109
Въпрос
Radian and steradian both have coherent unit expression 1. What distinguishes them?
Отговор
Radian (rad) is used for plane angle; steradian (sr) is used for solid angle. Their symbols preserve the quantity context.
Карта 110
Въпрос
For temperature intervals, how do kelvin and degrees Celsius compare?
Отговор
A change of 1 K equals a change of 1 °C. Their zero points differ, so absolute temperatures aren't numerically equal.
110 карти
SI Units Flashcards: 7 Base Units & 22 Named Derived Units
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