Dimensionless Quantities
Easyphysics
Which is dimensionless?
Select the correct option:
Solution
Incorrect! Answer:
All of these
Dimensionless quantities are ratios of similar physical quantities.
- Strain: ΔL/L (Length / Length). Dimensionless.
- Refractive Index: cvacuum/cmedium (Speed / Speed). Dimensionless.
- Angle: Arc length/Radius (Length / Length). Dimensionless. Even though angles have units (degrees/radians), they do not have physical dimensions (M,L,T).
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About This Question
- Subject
- physics
- Chapter
- physics and measurement
- Topic
- dimensionless quantities
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
All of these
Dimensionless quantities are ratios of similar physical quantities.
- Strain: ΔL/L (Length / Length). Dimensionless.
- Refractive Index: cvacuum/cmedium (Speed / Speed). Dimensionless.
- Angle: Arc length/Radius (Length / Length). Dimensionless. Even though angles have units (degrees/radians), they do not have physical dimensions (M,L,T).
This easy difficulty physics question is from the chapter physics and measurement, covering the topic of dimensionless quantities. It appeared in the 2025 exam.
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