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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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