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GK QUESTION#3108

Statement I: A spherometer is used to measure the radius of curvature of spherical surfaces like lenses and mirrors. Statement II: A spherometer typically has a triangular metallic frame supported on three legs with a central screw for fine adjustment. Statement III: A viscometer is used to measure the radius of spherical objects.

  1. AAll three statements are correct
  2. BOnly I and II are correctCorrect answer
  3. COnly II and III are correct
  4. DOnly I and III are correct
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Answer

B. Only I and II are correct

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Explanation

A spherometer measures the curvature of spherical surfaces with a central screw relative to three supporting legs. NCERT describes a triangular frame for the usual laboratory instrument. A viscometer measures viscosity, so only Statements I and II are correct.

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