MCQ practice · SSC Physics Board questions · Chapter 1: Physical Quantities and Their Measurements
What is the dimension of stress?
Think it through first, then pick an option.
- a ML⁻¹T⁻²
- b ML²T⁻²
- c ML²T⁻³
- d ML⁻²T⁻³
Answer and explanation
Correct answer: a ML⁻¹T⁻²
Stress = force ÷ area = MLT⁻² ÷ L² = ML⁻¹T⁻².
Why the other options are wrong
- b ML²T⁻²: ML²T⁻² is the dimension of work and energy; in stress the exponent of L is −1, not 2. Stress = force ÷ area = MLT⁻² ÷ L² = ML⁻¹T⁻².
- c ML²T⁻³: ML²T⁻³ is the dimension of power; in stress the exponent of L is −1, not 2. Stress = force ÷ area = MLT⁻² ÷ L² = ML⁻¹T⁻².
- d ML⁻²T⁻³: ML⁻²T⁻³ is wrong; in stress the exponent of L is −1, not −2. Stress = force ÷ area = MLT⁻² ÷ L² = ML⁻¹T⁻².
More board questions on this topic
- What is the dimension of pressure?
- What is the dimension of density?
- What is the dimension of retardation?
- Which two quantities have the same unit?
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