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.
Last updated
320 questions · page 6 of 16
- A. Zero
- B. Very high
- C. Narrow
- D. Infinite
Explanation: Semiconductors have a narrow but non-zero energy band gap(typically between 0.2 eV and 3 eV).This allows them to act as insulators at…
Correct answer: Narrow- A. Ferromagnetism
- B. Paramagnetism
- C. Diamagnetism
- D. All of these
Explanation: Ferromagnetism is characterized by the presence ofmagnetic domains, which are microscopic regions where themagnetic moments of atoms are…
Correct answer: Ferromagnetism- A. Gases
- B. Liquids
- C. Solids
- D. All of these
Explanation: Longitudinal strain (change in length per unit length)requires a material to have a definite shape to resist tensileor compressive forces.
Correct answer: Solids- A. Solids
- B. Liquids
- C. Gases
- D. Liquids and gases
Explanation: The shear modulus measures resistance to a change inshape without a change in volume.
Correct answer: Liquids and gases- A. Diamagnetic
- B. Ferromagnetic
- C. Low retentivity
- D. Both (a) and (c)
Explanation: The Curie temperature is a critical point for magneticmaterials. Below this temperature, a material like ironexhibits strong ferromagnetic…
Correct answer: Ferromagnetic- A. From stronger to the weaker parts of the field
- B. From weaker to the stronger parts of the field
- C. Perpendicular to the field
- D. In none of the above directions
Explanation: Diamagnetic materials are weakly repelled by magneticfields. As a result, when placed in a non-uniform magneticfield, they will experience…
Correct answer: In none of the above directions- A. High coercivity
- B. Low coercivity
- C. Low retentivity
- D. Both (a) and (c)
Explanation: A permanent magnet must be able to resist demagnetizationfrom external fields.
Correct answer: High coercivity- A. Soft iron
- B. Steel
- C. Iron
- D. Alnico
Explanation: Transformer cores require a material that can be easilymagnetized and demagnetized with low energy loss.
Correct answer: Soft iron- A. High-high
- B. Low-low
- C. Low-high
- D. High-low
Explanation: To be a strong and lasting magnet, a material must havehigh retentivity (to retain a strong magnetic field) and highcoercivity (to resist…
Correct answer: High-high- A. Low retentivity and high coercive force
- B. High retentivity and high coercive force
- C. Low retentivity and low coercive force
- D. High retentivity and low coercive force
Explanation: Electromagnets need to be switched on and off easily. Softiron is ideal because it has low retentivity (it doesn't staymagnetized) and low…
Correct answer: Low retentivity and low coercive force- A. s²/2y
- B. 2y/s²
- C. s/2y
- D. 2s²y
Explanation: The energy stored per unit volume in a wire under elasticdeformation is given by the formula U = (1/2) ×Y ×S2, whereU is the energy per…
Correct answer: s²/2y- A. 4 x 10^5
- B. 2 x 10^5
- C. 1 x 10^5
- D. None of these
Explanation: The breaking strength of a wire is directly proportional to itscross-sectional area.
Correct answer: 1 x 10^5- A. A
- B. B
- C. C
- D. D
Explanation: The correct condition for no change in the lengths of theindividual rods when the temperature increases is given bythe equation A1Y1α1 =…
Correct answer: D- A. A. 2 x 10^11 Pa
- B. B. 1 x 10^11 Pa
- C. C. 3 x 10^11 Pa
- D. D. 5 x 10^10 Pa
Explanation: To calculate Young's modulus (Y), use the formula Y =Stress/Strain. Here, Stress = Force (F) / Area (A) and Strain =Extension (Δl) /…
Correct answer: A. 2 x 10^11 Pa- A. Y₁ + Y₂
- B. Y₁ + Y₂ / 2
- C. Y₁Y₂ / (Y₁ + Y₂)
- D. under root Y₁Y₂
Explanation: The correct answer is Option B: 2(Y1Y2)/(Y1 + Y2). In ascenario where two wires are of equal length and cross-section, the effective or…
Correct answer: Y₁Y₂ / (Y₁ + Y₂)- A. Energy stored in a stretched wire
- B. Young's double slit phenomenon
- C. Bulk Modulus
- D. Young's Modulus
Explanation: The Young's modulus (E) is a property of the material that tells us how easily it can stretch and deform and is defined as the ratio of…
Correct answer: Young's Modulus- A. Solid nuclei
- B. Sugar solution
- C. Solid graphite
- D. None
Explanation: The conduction of electricity depends on the movement of electrons and other charged particles (ions).
Correct answer: Solid graphite- A. Ductile substance
- B. Brittle substance
- C. Crystalline substance
- D. Polymeric substance
Explanation: Substances that elongate considerably and undergo plastic deformation before they break are known as ductile substances (A).
Correct answer: Ductile substance- A. Polymeric strain
- B. Volumetric strain
- C. Parallel strain
- D. Tensile strain
Explanation: The ratio of the change of volume of the body to the original volume is known as volumetric strain.
Correct answer: Volumetric strain- A. Trivalent Element
- B. Second Group Element
- C. Fourth Group Element
- D. Pentavalent Element
Explanation: Explanation:To convert a silicon (Si) crystals into a p-type semi-conductor, it needs to be doped with a trivalent element, which means an…
Correct answer: Trivalent Element