Question:
What is the SI unit of luminous intensity ?
What is the SI unit of luminous intensity ?
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Luminous intensity is one of the seven SI base quantities, measured in candela.
Updated On: Oct 1, 2026
- Ampere
- Coulomb
- Candela
- Ohm
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the Question:
The SI system has seven base quantities: length, mass, time, electric current, temperature, amount of substance and luminous intensity. Each has one base unit.
Step 2: Key Fact:
The base unit of luminous intensity is the candela, symbol cd. It measures how strongly a source shines in a given direction as seen by the human eye.
Step 3: Detailed Explanation:
Match the base units with their quantities:
metre for length, kilogram for mass, second for time, ampere for electric current, kelvin for temperature, mole for amount of substance, candela for luminous intensity.
So the unit asked for in the question is the candela.
Step 4: Why the other options are wrong.
Option (A) Ampere is the unit of electric current. Option (B) Coulomb is the unit of electric charge, a derived unit equal to one ampere-second. Option (D) Ohm is the unit of electrical resistance, also a derived unit. None of these measures brightness of a source.
Final Answer:
The SI unit of luminous intensity is the candela, option (C). \[ \boxed{\text{Candela (C)}} \]
The SI system has seven base quantities: length, mass, time, electric current, temperature, amount of substance and luminous intensity. Each has one base unit.
Step 2: Key Fact:
The base unit of luminous intensity is the candela, symbol cd. It measures how strongly a source shines in a given direction as seen by the human eye.
Step 3: Detailed Explanation:
Match the base units with their quantities:
metre for length, kilogram for mass, second for time, ampere for electric current, kelvin for temperature, mole for amount of substance, candela for luminous intensity.
So the unit asked for in the question is the candela.
Step 4: Why the other options are wrong.
Option (A) Ampere is the unit of electric current. Option (B) Coulomb is the unit of electric charge, a derived unit equal to one ampere-second. Option (D) Ohm is the unit of electrical resistance, also a derived unit. None of these measures brightness of a source.
Final Answer:
The SI unit of luminous intensity is the candela, option (C). \[ \boxed{\text{Candela (C)}} \]
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