MCQ practice · SSC Physics Board questions · Chapter 1: Physical Quantities and Their Measurements
What is the dimension of power?
Think it through first, then pick an option.
- a MLT⁻³
- b ML²T⁻²
- c ML⁻¹T⁻³
- d ML²T⁻³
Answer and explanation
Correct answer: d ML²T⁻³
Power = work ÷ time = ML²T⁻² ÷ T = ML²T⁻³.
Why the other options are wrong
- a MLT⁻³: MLT⁻³ is wrong; in power the exponent of L is 2, not 1. Power = work ÷ time = ML²T⁻² ÷ T = ML²T⁻³.
- b ML²T⁻²: ML²T⁻² is the dimension of work and energy; in power the exponent of T is −3, not −2. Power = work ÷ time = ML²T⁻² ÷ T = ML²T⁻³.
- c ML⁻¹T⁻³: ML⁻¹T⁻³ is wrong; in power the exponent of L is 2, not −1. Power = work ÷ time = ML²T⁻² ÷ T = ML²T⁻³.
More board questions on this topic
- Which pair of quantities has the same dimension?
- Which two quantities have the same dimension?
- What is the dimension of stress?
- What is the dimension of stress?
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