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NDA 2017 GAT · General Knowledge · Units and Measurements · easy

The SI unit of impulse is

Single correct option

The SI unit of impulse is
  1. A. N m
  2. B. N / s
  3. C. N s
  4. D. J s
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Answer: (C) N s

Impulse equals force multiplied by the time for which it acts, which is also the change in momentum. Its unit is therefore newton second (kg m/s). N m is the unit of torque or work, N/s is the rate of change of force, and J s is the unit of angular momentum or Planck's constant, so none of these fit.
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Original question written in the NDA 2017 GAT pattern and checked twice for the correct answer. Not an official question paper. How we write and check questions · Corrections policy · Report a mistake