MCQ practice · SSC Physics Board questions · Chapter 1: Physical Quantities and Their Measurements
What is the dimension of velocity?
Think it through first, then pick an option.
- a LT⁻²
- b L⁻¹T
- c L⁻¹T²
- d LT⁻¹
Answer and explanation
Correct answer: d LT⁻¹
Velocity = length ÷ time, so its dimension is L ÷ T = LT⁻¹.
Why the other options are wrong
- a LT⁻²: LT⁻² is the dimension of acceleration; in velocity the exponent of T is −1, not −2. Velocity = length ÷ time, so its dimension is L ÷ T = LT⁻¹.
- b L⁻¹T: L⁻¹T is wrong; in velocity the exponent of L is 1, not −1. Velocity = length ÷ time, so its dimension is L ÷ T = LT⁻¹.
- c L⁻¹T²: L⁻¹T² is wrong; in velocity the exponent of L is 1, not −1. Velocity = length ÷ time, so its dimension is L ÷ T = LT⁻¹.
More board questions on this topic
- Which one is the dimension of acceleration?
- Which one of the following is a nanosecond?
- In the equation v = u + at, which is the dimension of at?
- What is the dimension of kinetic energy?
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