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 3 of 16
41. Materials in which valence electrons are tightly bound to their atoms at low temperature are called
- A. Semiconductor
- B. Superconductor
- C. Insulator
- D. Conductor
Explanation: Insulators have tightly bound valence electrons that do not contribute significantly to electrical conduction at low temperatures.
Correct answer: Insulator- A. 1
- B. zero
- C. infinity
- D. none of these
Explanation: Liquids do not have a modulus of elasticity in the same way that solids do.
Correct answer: none of these- A. Y/2
- B. 2Y
- C. Y
- D. 4Y
Explanation: Young's modulus (Y) is a material property and does not depend on the dimensions of the specimen.
Correct answer: Y- A. short range order
- B. no definite melting point
- C. sharp melting point
- D. All
Explanation: Crystalline substances typically have a well-defined, sharp melting point.
Correct answer: no definite melting point- A. Conduction Band
- B. Valence Band
- C. Forbidden band
- D. Core band
Explanation: The valence band is completely filled with electrons, and these electrons are involved in chemical bonding
Correct answer: Valence Band- A. Transports vibration
- B. Transports signals
- C. Transports charge
- D. Transports impulses
Explanation: Electrons in the conduction band are free to move and carry an electric charge, contributing to electrical conductivity.
Correct answer: Transports charge- A. Decreases
- B. Increases
- C. Remain the same
- D. First increases then decreases
Explanation: In intrinsic semiconductors, increasing the temperature leads to more thermal generation of charge carriers (electrons and holes), which…
Correct answer: Decreases- A. Conductors
- B. Insulators
- C. Semiconductors
- D. All of the above
Explanation: Holes can exist in all types of materials: conductors, insulators, and semiconductors.
Correct answer: All of the above- A. the shear
- B. the fractional change in volume
- C. the fractional change in length
- D. the pressure
Explanation: Young's modulus (E) is a measure of the stiffness of a material and is defined as the ratio of stress to strain in the linear elastic…
Correct answer: the fractional change in length- A. Holes only
- B. Electrons only
- C. Electrons and holes both
- D. None of these
Explanation: Semiconductors can have both electrons and holes as charge carriers. Electrons are the majority carriers in n-type semiconductors, while…
Correct answer: Electrons and holes both- A. Remains underwater
- B. Returns to its original shape when the stress is removed
- C. Bends at 180 degrees
- D. Breaks
Explanation: The ultimate strength of a sample is the maximum stress that the sample can withstand before it breaks or fractures.
Correct answer: Breaks- A. Squids
- B. MRI
- C. Magnetometer
- D. Oscilloscope
Explanation: Superconducting Quantum Interference Devices (SQUIDs) are highly sensitive detectors used to measure very weak magnetic fields, often at…
Correct answer: Squids- A. Four corners
- B. Nine corners
- C. Eight corners
- D. Six corners
Explanation: a simple cube structure, each corner is shared by eight adjacent cubes.
Correct answer: Eight corners- A. The fractional change in volume
- B. The shear
- C. The fractional change in length
- D. The spring constant
Explanation: The bulk modulus (K) is a measure of the resistance of a material to uniform compression.
Correct answer: The fractional change in volume- A. zero
- B. infinite
- C. 1
- D. none of these
Explanation: Young's modulus (Y) is a measure of the stiffness of a material. For a perfectly rigid body, which does not deform under any stress, the…
Correct answer: infinite- A. 10^7 N
- B. 10^11N
- C. 2 × 10^7 N
- D. 2 x 10^11 N
Explanation: The force (F) required to stretch a wire can be calculated using Hooke's Law: F=Y⋅A⋅ΔL/L , where:Y is the Young's modulus,A is the…
Correct answer: 2 × 10^7 N- A. 16 J
- B. 4 J
- C. 8 J
- D. 1/4 J
Explanation: Work Done in Stretching a Wire:The work done in stretching a wire depends on two factors:Force (F): The force applied to stretch the…
Correct answer: 4 J- A. the same stress and strain
- B. the same strain but different stresses
- C. the same stress but different strain
- D. different stresses and strains
Explanation: Since the wires are connected end to end and are subjected to the same force, they experience the same change in length.
Correct answer: the same strain but different stresses- A. ultimate tensile strength
- B. permanent stress
- C. elastic stress
- D. all type of stress
Explanation: The ultimate tensile strength (UTS) is the maximum stress that a material can withstand while being stretched or pulled before necking…
Correct answer: ultimate tensile strength- A. weak substances
- B. brittle substances
- C. ductile substances
- D. polymeric substances
Explanation: Brittle substances are those materials that break or fracture soon after they exceed their elastic limit.
Correct answer: brittle substances