UPSC CAPF AC 2026 Paper 1 · Question 118

Question 118 of the UPSC CAPF (AC) 2026 Paper I (19 July 2026). Try it first, then open the answer and explanation.

1. CAPF 2026 · P-I · Q118 · General Science · Physics

   Which one of the following does not generally obey Hooke's law?

   1. Glass
   2. Quartz
   3. Clay
   4. Copper

   निम्नलिखित में से कौन-सा, हुक के नियम (Hooke's law) का सामान्यतः पालन नहीं करता है?

   1. काँच
   2. स्फटिक (quartz)
   3. मृत्तिका (clay)
   4. ताँबा
   Show answer

   Answer: (3) Clay

   उत्तर: (3) मृत्तिका (clay)

   Hooke's law (stress is proportional to strain within the elastic limit) holds for elastic solids such as glass, quartz and copper. Clay is a plastic material: it deforms permanently even under small forces and does not regain its shape, so it does not obey Hooke's law.

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