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 2 of 16
- A. Insulator
- B. Conductor
- C. Semiconductor
- D. Superconductor
Explanation: The correct answer is Insulator. Insulators have the largest energy gap among the given options, which prevents electrons from easily…
Correct answer: Insulator- A. Trivalent
- B. Tetravalent
- C. Pentavalent
- D. Monovalent
Explanation: The correct answer is Trivalent. Trivalent impurities, such as Boron, have three valence electrons.
Correct answer: Trivalent- A. Rubber
- B. Steel
- C. Glass
- D. Copper
Explanation: Rubber possesses the highest elasticity among the given options. It can undergo significant deformation under stress and return to its…
Correct answer: Rubber- A. Nm^-2
- B. Jm^-2
- C. Nm^-1
- D. Being a number, it has no unit
Explanation: The modulus of elasticity, also known as Young's modulus, measures the stiffness of a material.
Correct answer: Nm^-1- A. MLT^-2
- B. ML^-2T^-1
- C. ML^-1T^-2
- D. ML^0T^-1
Explanation: Stress is defined as force per unit area and is expressed in units of pressure.
Correct answer: MLT^-226. Which one of the following physical quantities does not have the dimensions of force per unit area?
- A. Stress
- B. Strain
- C. Young modulus
- D. Pressure
Explanation: Explanation: Strain is a dimensionless quantity that represents the relative deformation or change in shape of a material due to stress.
Correct answer: Strain- A. zero
- B. 1
- C. 1/2
- D. double
Explanation: Strain is defined as the change in length per unit length. If a wire is stretched to double its original length, the strain will be the…
Correct answer: 1/2- A. Fl
- B. 1/2Fl
- C. Fl^2 /L
- D. 1/2fl^2
Explanation: The amount of energy stored in an elastic material when stretched is given by the formula 1/2 * force * extension.
Correct answer: 1/2Fl- A. Ye
- B. Ye²
- C. 1/2Ye
- D. 1/2Ye²
Explanation: The energy stored per unit volume in an elastic material is given by the formula 1/2 * stress * strain.
Correct answer: 1/2Ye²- A. 0.01J
- B. 0.02J
- C. 0.04J
- D. 1J
Explanation: The energy gained by the wire is given by the formula 1/2 * force * extension.
Correct answer: 0.01J- A. Elastic region
- B. Non-Elastic region
- C. both a and b
- D. Elastic for small force
Explanation: The area method is valid for both the elastic and non-elastic regions. In the elastic region, the area under the stress-strain curve…
Correct answer: both a and b- A. Positive
- B. Negative
- C. Neutral
- D. None of these
Explanation: N-type crystals are doped semiconductors where the majority charge carriers are electrons.
Correct answer: Negative- A. 10^4 to 10^6 Ωm
- B. 10^4 to 10^4 Ωm
- C. 10^7
- D. 10^-10 to 10^-20 Ωm
Explanation: The resistivity of semiconductors typically falls in the range of 10^4 to 10^6 Ωm.
Correct answer: 10^4 to 10^4 Ωm- A. Inversely
- B. Directly
- C. Does not depend
- D. None of these
Explanation: theseYoung's modulus generally increases with temperature. This is because at higher temperatures, materials tend to vibrate more, causing…
Correct answer: Directly- A. Filled conduction and valence band
- B. Empty conduction, and filled valence band
- C. Empty conduction and valence band
- D. Filled conduction, and empty valence band
Explanation: At absolute zero (0 K), the valence band of silicon is fully occupied by electrons, while the conduction band is empty.
Correct answer: Empty conduction, and filled valence band- A. Indium, aluminum, phosphorous
- B. Aluminum, indium, gallium
- C. Phosphorous, antimony, arsenic
- D. None
Explanation: Donor atoms are those that contribute additional electrons to the semiconductor material, increasing its electron concentration.
Correct answer: Indium, aluminum, phosphorous- A. stifness
- B. toughness
- C. extension
- D. deformation
Explanation: Deformation is a general term that refers to any alteration in shape, length, or volume when a body is subjected to an external force
Correct answer: deformation- A. Energy state
- B. Valance bond
- C. Conduction Bond
- D. -ive Energy bond
Explanation: The valence band is the energy band in which the valence electrons reside.
Correct answer: Valance bond- A. Semiconductor becomes conductors
- B. Ferromagnetic becomes paramagnetic
- C. Paramagnetic becomes diamagnetic
- D. Metals become superconductor
Explanation: The Curie temperature is the temperature at which ferromagnetic materials lose their permanent magnetic properties and become paramagnetic.
Correct answer: Ferromagnetic becomes paramagnetic- A. Orbital motion of electron
- B. Spin motion of electron
- C. Spin motion of nucleus
- D. All
Explanation: Both the orbital motion of electrons around the nucleus and the spin motion of electrons contribute to the generation of a magnetic field.
Correct answer: All