An angular displacement of 90 degrees is equal to:
Correct answer: A. One-fourth revolution
- A. One-fourth revolution
- B. One-third revolution
- C. One half revolution
- D. One complete revolution
Explanation
A full revolution is 360 degrees, so 90 degrees is a quarter of it, equivalent to pi over 2 radians. Half a revolution would be 180 degrees or pi radians. Converting between degrees, radians and revolutions is worth doing fluently, since rotational formulae require radians.
This question appeared on the UHS MDCAT 2025 paper, which you can sit online with every answer explained.
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About Angular Displacement
Angular displacement measures the change in a body’s angular position and is expressed in radians or degrees, with anticlockwise and clockwise directions assigned signs. It connects to arc length, angular velocity and angular acceleration, and must be distinguished from ordinary linear displacement in rotational motion.
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