Physics of Solids Notes Class 11 FBISE NBF: Solved chapter on solids properties, classification, deformation, stress-strain, energy. From Hamdard Science Academy PDF include MCQ’s, Short response, long response, numericals, assignment and more…
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Physics of Solids
Branch studying solid properties: mechanical, electrical, thermal, optical. Solids have fixed shape/volume due to strong forces; particles vibrate.
Examples: Crystalline (salt, metals), amorphous (glass, rubber), deformation (rubber band elastic, paperclip plastic).
Classification
- Crystalline: Ordered lattice, anisotropic, sharp melting.
- Polycrystalline: Grains of crystals, isotropic macroscopically (metals, ceramics).
- Amorphous: Disordered, isotropic, glass transition (glass, plastics).
Crystal Lattice: 3D points array. Unit Cell: Smallest repeating unit.
Deformation
Stress σ = F/A (tensile, compressive, shear). Units: Pa.
Strain ε = ΔL/L0 (dimensionless).
Hooke’s Law: σ = Yε (elastic limit).
Moduli: Young’s Y (tensile), Shear G, Bulk K.
Stress-Strain Curve
Proportional/elastic limit, yield, plastic, UTS, fracture. Ductile (large plastic), brittle (little plastic).
Elastic Potential Energy
U = (1/2)kx² = (1/2)σ ε V. Density u = (1/2)σ ε.
Young’s modulus experiment: Wires, loads, measure extension.
Exercises Solved
Solved MCQs
a. Amorphous (glue)
b. Glass-transition
c. Network structure (silicon)
d. [W1+(3W/4)]/S
e. mg/A
f. 400π N
g. Bending
h. 1×10¹²
i. Resilience
j. Constant
Short Responses
7.1 Crystalline stable low energy.
Glass transition reversible, no latent heat.
7.2 Milky from devitrification/leaching.
No flow at room temp.
7.3 Strain fundamental kinematic; stress response.
7.4 Yes, via Poisson’s ratio.
7.5 Slope = stiffness k.
7.6 Always positive.
7.7 Axial, bending, shear, torsion formulas.
7.8 Dangerous fatigue/corrosion.
7.9 Strain hardening/cracks.
7.10 Stiffness/resistance to deformation.
Long Responses
7.1 Classifications details.
7.2 Unit cells types.
7.3 Stress/strain/modulus.
7.4 Ductile curve stages.
7.5 Elastic recoverable; plastic permanent.
7.6 Area = work.
7.7 Derivation U=1/2 kx².
7.8 Young’s experiment.
Numericals
7.1 Force ~51N, mass~5.2kg.
7.2 Copper d~2.29mm.
7.3 ΔL~0.279mm, U~0.011J.
7.4 U=60.75J.
7.5 σ~2.55kPa.
Assignments
7.1 ΔL~23m.
7.2 ε~10^{-4}.
7.3 W=0.02J.
Master physics of solids chapter notes FBISE with NBF physics unit 7 solved.
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