Free Physics of Solids MCQs with Answers
320 Physics of Solids MCQs from Physics, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Solids are compared through crystal structure, amorphous arrangement, elasticity, plastic deformation, stress, strain and Young’s modulus. Electrical behavior depends on available charge carriers and band structure, so conductors, insulators and semiconductors must be distinguished from mechanical properties such as strength, stiffness and brittleness.
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320 questions · page 5 of 16
- A. [MLT^ -2]
- B. [ML^-1T^-2]
- C. [MLA-1T^21
- D. [M^-2L^-2T^-1]
Explanation: The modulus of elasticity is defined as the ratio of stress to strain.* Stress is defined as force per unit area, with dimensions…
Correct answer: [ML^-1T^-2]- A. 2 cm
- B. 4 cm
- C. 8 cm
- D. 16 cm
Explanation: The height (h) of capillary rise is inversely proportional to the tube's radius (r).
Correct answer: 8 cm- A. 1
- B. 2
- C. 5
- D. 1/2
Explanation: The tensile strain remains the same because it is defined asthe ratio of change in length to the original length, which is aproperty of…
Correct answer: 1- A. Glass
- B. Copper
- C. Aluminium
- D. All of these
Explanation: Glass is a non metallic material which shatters easily, makingit a classic example of a brittle material.
Correct answer: Glass- A. n
- B. p1/n
- C. p/n
- D. pn
Explanation: The bulk modulus is defined as K = -V(dP/dV). By differentiating the given relation V Pⁿ = constant, we find that the bulk modulus for…
Correct answer: pn- A. F
- B. 4F
- C. 6F
- D. 9F
Explanation: Force to stretch a wire: F=YAΔL/L. Both wires have the same volume: F'/F = A'/A x L/L' = 3x3 F' = 9F
Correct answer: 6F- A. 10⁹ N/m²
- B. 2 × 10⁹ N/m²
- C. 3 × 10⁹ N/m²
- D. 4 × 10⁹ N/m²
Explanation: Bulk modulus is K = -ΔP / (ΔV/V). The pressure change at200 m is ΔP = ρgh = 1000×10×200 = 2 x 10⁶ Pa.
Correct answer: 2 × 10⁹ N/m²- A. 20 cm/s
- B. 20 m/s
- C. 2 m/s
- D. None of these
Explanation: The potential energy stored in the stretched cord is E = (1/2)× Stress × Strain × Volume.
Correct answer: 20 m/s- A. 0.045
- B. 0.03
- C. 0.45
- D. 4.5
Explanation: For small changes, the bulk strain (ΔV/V) is approximatelythree times the linear strain (ΔL/L).
Correct answer: 0.045- A. 3.3
- B. 6.4
- C. 7.2
- D. 12.8
Explanation: The density of the sphere is the average of the two fluiddensities, since it is half-immersed in eachρ=0.8+13.6/2 = 7.2 g/cm³.
Correct answer: 7.2- A. Infinity
- B. Zero
- C. Unity
- D. -1
Explanation: Young's modulus measures resistance to deformation (Strain) under Stress.
Correct answer: Infinity- A. 1
- B. 2
- C. 3
- D. 4
Explanation: Solids are classified into two main contrasting categories:Crystalline(regular, repeating, three dimensional structure)and…
Correct answer: 2- A. Zn
- B. Cd
- C. Mg
- D. None of these
Explanation: Zn, Cd and Mg all crystallize in Hexagonal ClosedPacking(HCP) structurehence none of these represent Face Centered Cubic (FCC).
Correct answer: None of these- A. Doubles
- B. Halved
- C. Four times
- D. Remains the same
Explanation: By halving the length of the wire, its cross-sectional areaeffectively doubles keeping the volume constant.
Correct answer: Remains the same- A. H₂O
- B. NaCl
- C. Cu
- D. Bi
Explanation: Paramagnetic materials have unpaired electrons, causingweak attraction to an external magnetic field. Water (H₂O) isweakly paramagnetiC.
Correct answer: H₂O- A. Diamagnetic
- B. Paramagnetic
- C. Ferromagnetic
- D. None of these
Explanation: Ferromagnetic materials, like iron and nickel, have amagnetic permeability much greater than 1.
Correct answer: Ferromagnetic- A. Diamagnetic
- B. Ferromagnetic
- C. Paramagnetic
- D. All of these
Explanation: Diamagnetic materials have a magnetic permeability slightlyless than 1.
Correct answer: Diamagnetic- A. Diamagnetic
- B. Paramagnetic
- C. Ferromagnetic
- D. All of these
Explanation: Diamagnetic materials create an induced magnetic fieldopposite to the applied field, so they are weakly repelled andmove from stronger to…
Correct answer: Diamagnetic- A. Less than 3eV
- B. Greater than 3eV
- C. Zero
- D. None
Explanation: In conductors,valence band and the conduction band overlap.This means there is no energy gap(the gap is zero),allowing electrons to move…
Correct answer: Zero- A. Zero
- B. Very high
- C. Narrow
- D. Infinite
Explanation: Insulators are characterized by a very large or high energy band gap(typically >3eV).This large gap makes it extremely difficult for…
Correct answer: Very high