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Standard IX
Physics
SI Units
The number of...
Question
The number of base SI units is:
A
5
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B
7
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C
6
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D
2
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Solution
The correct option is
B
7
The SI system has seven base units. These are tabulated below:
Physical Quantity
SI Unit
Symbol
Length
metre
m
Mass
kilogram
kg
Time
second
s
Temperature
Kelvin
K
Electric Current
Ampere
A
Amount of substance
mole
mol
Luminous intensity
candela
cd
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