12th class Physics MCQs Preparation 2022 and Onwards (Unit: Physics of Solids: Set-2 (34 MCQs)) for National MDCAT, ECAT, FPSC, PPSC, JOB Exam, Physics Lecturer, SSC, HSSC (F.Sc.), BS, MS Exams NTS, ETS ETc..



1. The shear modulus of elasticity G is




... Answer is C. F/Aθ
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2. The temperature at which material becomes superconductor is called




... Answer is B. critical temperature
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3. Which of the following is not a ferromagnetic material?




... Answer is D. Barium
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4. The ratio of stress to the strain is




... Answer is C. Constant
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5.  A wire is stretched to double of its length. Its strain is




... Answer is B. 1
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6. Which of the modulus of elasticity is involved in compressing a rod to decrease its length?




... Answer is A. Young's modulus
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7. A wire is stretched to double of its length. The strain is: :




... Answer is B. 1
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8. If both the length and radius of the rod are doubled, then the modulus of elasticity will




... Answer is C. remains the same
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9. Curie temperature is a point where




... Answer is C. ferromagnetism changes to paramagnetism
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10. A cable breaks if stretched by more than 2 mm . It is cut into two equal parts . How much either part can be stretched with breaking.




... Answer is B. 1 mm
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11. Which states of matter are incompressible and have definite volume and shapes:




... Answer is D. Solids
Solids are incompressible and have definite volume and shapes


12. The solids in which their atoms, molecules or ions are arranged in a definite order are called:




... Answer is A. Crystalline solids
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13. Which of the solid is not a Crystalline solid:




    ... Answer is D. Glass
    Glass is amophous solid while Sodium Chloride (NaCl), Sugar. and Diamond are Crystalline solid.


    14.  The solids whose constituent particles i.e. atoms, molecules or ions are arranged more -or-less in a random manner are called:




    ... Answer is C. Amorphous solids
    Amorphous solids have not definite regular geometrical or crystalline shapes.


    15. The solids in which the atoms, molecules or ions are arranged neither periodically like crystalline nor random like amorphous are called:




    ... Answer is B. Polymeric Solids
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    16.. The amorphous solid is also named as ?




    ... Answer is D. Glassy Solid
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    17. When the deforming force is applied on a box, the perpendicular axes of the box are displaced from their original position. This cause change in the shape of the box called :




    ... Answer is C. shearing
    tensile = change in length, volumetric = change in volume, shearing = change in shape. elasticity = property of solid to regain original position.


    18. The bodies which can not regain their original shape and size but a permanent change occurs in it after the removal of deforming force is called




    ... Answer is A. Plastics
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    19. SI unit of stress?




    ... Answer is C. N m⁻²
    The formula for stress ie. Stess = `\frac {F}{A}`, where F = deforming force and A = area


    20. Directional formula of stress?




    ... Answer is D. [M L⁻¹ T⁻²]
    The formula for stress = `\frac {F}{A}`, the dimension F = [M L T⁻²] and A = [L²]


    21. When the deforming force produces a change in the shape of body (without changing its volume), the strain is called ?




    ... Answer is B. Shear Strain
    Strain is ratio of same quantity ie. Shear Strain = `\frac {Δx}{l}`, Longitudinal Strain ε = `\frac {ΔL}{L}` and Volumetric Strain = `\frac {ΔV}{V}`


    22. The statement "Within elastic limit the strain is directly proportional to the applied stress" is called




    ... Answer is B. Hooke's Law
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    23. The Young's modulus 'Y' of an elastic body is due to the applied stress 'S', the energy stored in the body per unit volume is:




    ... Answer is B. `\frac {1}{2}` Y(strain)²
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    24. The materials whose ultimate tensile strength and breaking point are close together are known as




    ... Answer is D. Brittle substances
    -

    25.  The ratio of volumetric stress to volumetric strain is called




    ... Answer is B. Bulk Modulus (K)
    K = `\frac {FV}{AΔV}`


    26. The ratio of shear stress to shear strain is called




    ... Answer is C. Modulus of Rigidity (η)
    η = `\frac {F}{Aθ}`


    27. A substance which is permanently deformed by the applied stress is called :




    ... Answer is B. Plastic
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    28. Conductivity range of insulators is between




    ... Answer is C. 10⁻¹¹ (Ω m)⁻¹ and 10⁻¹⁹ (Ω m)⁻¹
    Unit of Conductivity is (Ω m)⁻¹ and Unit of Resistivity is Ω m


    29. Resistivity range of conductors is between




    ... Answer is B. 10⁻² Ω m and 10⁻⁸ Ω m
    Unit of Conductivity is (Ω m)⁻¹ and Unit of Resistivity is Ω m


    30. Certain material such as mercury, tin, lead and vanadium, when cooled by liquid helium to low temperature become:




    ... Answer is D. Superconductor
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    31. When the resistivity of some materials fall to zero at certain temperature called critical temperature Tc. this phenomenon is called:




    ... Answer is B. Superconductivity
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    32. When the area of hysteresis loop is large, energy dissipation is




    ... Answer is B. Large
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    33. Resistivity range of semiconductors is between




    ... Answer is C. 10⁻⁶ Ω m and 10⁶ Ω m
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    34. The range of the conductivity in semiconductor's is




    ... Answer is C. 10⁻⁶ (Ω m)⁻¹ and 10⁴ (Ω m)⁻¹
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