Elastic behaviour of solids - class-XI

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Multiple Choice

Which of the following statements is incorrect?

  1. When a material is under tensile stress, the restoring forces are caused by interatomic attraction while under compressional stress, the restoring force is due to interatomic repulsion
  2. The stretching of a coil is determined by its shear modulus
  3. Rubber is more elastic than steel
  4. Shearing stress plays an important role in the buckling of shafts
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