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Elastic Properties of solids — Syllabus

NIOS · Class 12 · Physics

What Elastic Properties of solids covers in NIOS Class 12 Physics: 4 topics, for the 2026-27 session. Part of the NIOS Class 12 Physics syllabus.

45 questions38 flashcards10 formulas & key relations5 concepts

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A labeled diagram illustrating the four main types of stress (tensile, compressive, shear, and hydraulic) acting on a solid body, showing the direction of applied forces and the resulting internal res
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4 Topics · NIOS Class 12 Physics · 2026-27

Topics in Elastic Properties of solids

1

Molecular Theory of Matter and Intermolecular Forces

  • All matter is made of atoms and molecules held together by intermolecular forces.
  • At equilibrium separation R₀ (≈ 10⁻¹⁰ m for solids), the net intermolecular force is zero.
  • When R > R₀: attractive force acts between molecules.
2

Elasticity, Elastic and Plastic Bodies

  • Elasticity is the property of matter to regain its original shape and size after removal of the deforming force.
  • Perfectly Elastic Body: regains original state completely on removal of deforming force. Example: Quartz fiber (nearest to perfectly elastic).
  • Perfectly Plastic Body: does not regain original shape at all. Example: Ordinary putty (nearest to perfectly plastic).
3

Stress — Definition, Types and Formula

  • When a deforming force is applied, internal restoring forces develop inside the body that oppose the deformation.
  • Stress = Internal Restoring Force per unit area of cross-section.
  • At equilibrium, restoring force = deforming force in magnitude (but opposite in direction).
4

Strain — Definition, Types and Formula

  • Strain is the change in dimension per unit original dimension of a body due to deforming force.
  • Strain is a DIMENSIONLESS and UNITLESS quantity (ratio of two similar quantities).
  • Three types of strain correspond to three types of stress: Linear Strain, Volume (Bulk) Strain, and Shearing Strain.

Key Concepts

Central concept: Elasticity of Solids

Molecular Theory of MatterStressStrainHooke's LawModuli of ElasticityPoisson's RatioStress-Strain CurveElastic vs Plastic Bodies

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Frequently Asked Questions

What are the important topics in Elastic Properties of solids for NIOS Class 12 Physics?
Key topics in Elastic Properties of solids include Molecular Theory of Matter and Intermolecular Forces, Elasticity, Elastic and Plastic Bodies, Stress — Definition, Types and Formula, Strain — Definition, Types and Formula. Study these first, then practise questions on each for the NIOS Class 12 board exam.
How should I revise Elastic Properties of solids for the NIOS Class 12 board exam?
Learn the core ideas first, then work through the 45 practice questions on Elastic Properties of solids. Revise definitions regularly and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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