The SI unit of angular displacement is:
Correct answer: C. Radian
- A. Meter
- B. Foot
- C. Radian
- D. Centimetre
Explanation
The radian (rad) is the SI unit of angular displacement. It is a dimensionless unit that represents the angle subtended when the arc length equals the radius of the circle. One radian is the angle formed when the radius of a circle wraps around the circumference. Angular displacement is often measured in radians because it provides a natural and convenient way to express rotational motion.
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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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