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GATE 2020 ST – Question 41

Calculus · Single Variable Calculus · 2 marks · Multiple choice

Which function is uniformly continuous on its stated domain?

  1. $e^{x^2}$ on R
  2. 1/x on0<x≤1, with f(0)=0
  3. x² for|x|≤1 and2/(1+x²) for|x|>1
  4. x for|x|≤1 and x² for|x|>1

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Correct answer: (C) x² for|x|≤1 and2/(1+x²) for|x|>1

Explanation

The third function joins continuously at±1 and has bounded derivative on each piece, yielding a global Lipschitz bound and uniform continuity: C. A grows too steeply at infinity, B is discontinuous at zero, and D is discontinuous at−1.

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