Three Dimensional Geometry (Quiz)

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Q.1 From a point P(λ, λ, λ) perpendiculars PQ and PR are drawn respectively on the lines y = x, z = 1 and y = -x , z = -1. If P is such that ∠QPR is a right angle, then the possible value (s) of λ is (are)
  $\sqrt{2}$
  1
  -1
  $-\sqrt{2}$