Which of the following is not a S.I. base quantity:
Correct answer: C. Velocity
- A. Mass
- B. Intensity of light
- C. Velocity
- D. Length
Explanation
Option A: Mass (kilogram, kg) is the amount of matter in an object. It is a fundamental property of matter that does not depend on the object's location or motion. Option B: Intensity of light (candela, cd) is the amount of light emitted from a source in a particular direction. It is a measure of the brightness of light. Option C: Velocity is a derived quantity, which means that it can be expressed in terms of the SI base quantities. For example, velocity is equal to the distance traveled divided by the time it takes to travel that distance, so it can be expressed in terms of the base quantities of length and time. Option D: Length (meter, m) is the distance between two points. It is a fundamental property of space that does not depend on the location or motion of the points.
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About Measurements
Physical quantities are expressed with SI base and derived units, while measurement limits are described through accuracy, precision, absolute and percentage error, and significant figures. Dimensional analysis checks equations, derives relationships and detects inconsistent units, but it cannot determine numerical constants or distinguish quantities with identical dimensions.
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