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NDA 2 2025 GAT, question 61

Topic: Physics

Q61

The work done by the force acting on an object is zero if the displacement of the object

  1. (a) is in the opposite direction of the direction of force
  2. (b) is in the same direction of the direction of force
  3. (c) is in perpendicular direction of the direction of forceCorrect answer
  4. (d) none of above

Solution.

Answer: (c) is in perpendicular direction of the direction of force

  1. For a constant force, work is W=Fs cosθ.
  2. If displacement is perpendicular to force, θ=90° and cosθ=0.
  3. Parallel and antiparallel displacements give positive and negative work respectively, not zero.