MCQ practice · SSC Physics Board questions · Chapter 1: Physical Quantities and Their Measurements
What is the dimension of kinetic energy?
Think it through first, then pick an option.
- a ML²T⁻²
- b ML²T⁻³
- c MLT⁻¹
- d MLT⁻²
Answer and explanation
Correct answer: a ML²T⁻²
Kinetic energy = ½mv² = M × (LT⁻¹)² = ML²T⁻².
Why the other options are wrong
- b ML²T⁻³: ML²T⁻³ is the dimension of power; in kinetic energy the exponent of T is −2, not −3. Kinetic energy = ½mv² = M × (LT⁻¹)² = ML²T⁻².
- c MLT⁻¹: MLT⁻¹ is the dimension of momentum; in kinetic energy the exponent of L is 2, not 1. Kinetic energy = ½mv² = M × (LT⁻¹)² = ML²T⁻².
- d MLT⁻²: MLT⁻² is the dimension of force; in kinetic energy the exponent of L is 2, not 1. Kinetic energy = ½mv² = M × (LT⁻¹)² = ML²T⁻².
More board questions on this topic
- What is the dimension of energy?
- Which of the following is the dimension of potential energy?
- Which pair of quantities has the same dimension?
- What is the dimension of power?
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