HSSC-II (Class-12) Solved Physics MCQs; Unit-16: Physics of Solids (Baluchistan Textbook Board, Quetta) With Verified Answers: 


1. When the temperature increases, the distance between the molecules of a crystal is




... Answer is B. Increased
The amplitude of vibration of atoms, molecules, or ions increases with increasing temperature.


2. Which one of the following has a low melting point?




... Answer is C. Polymer
Polymeric solids have low melting point than Crystalline and Amorphous solids


3. Which one of the following is called a glassy solid?




... Answer is B. Amorphous
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4. Which one of the following is a polymeric solid?




... Answer is D. Copper
Copper is a polymeric solid, while Wool and Glass are amorphous and Sodium chloride is crystalline


5.  The applied force which produces a change in a body is called




... Answer is B. Deforming force
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6. The property of a body to attain its original position after the removal of force is called




... Answer is C. Elasticity
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7. Which one of the following is without any dimension and unit? :




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


8. Modulus of elasticity is dimensionally equal to




... Answer is C. Stress
As E = Stress / Strain and strain has no unit, the Modulus of elasticity has the same unit as Stress (N m⁻²).


9. 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}`. `\frac {S^2}{Y}`
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10. If the applied stress is increased, then according to Hook's law the ratio of stress to strain will be




... Answer is C. Constant
Within the elastic limit stress ∝ strain


11. A substance that is permanently deformed by the applied stress is called




... Answer is B. Plastic
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12. A body that breaks down just crossing the elastic limit is known as




... Answer is D. Brittle
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13. Which one of the following substances is very strong in compression?




    ... Answer is B. Brittle
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    14.  Resistivity range of insulators is between




    ... Answer is D. 10¹¹ Ω m and 10¹⁹ Ω m
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    15. The order of the conductivity of the conductors is




    ... Answer is A. 10² (Ω m)⁻¹ and 10⁸ (Ω m)⁻¹
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    16.. Which one of the following substances has a partially filled valence band?




    ... Answer is B. Conductor
    In a conductor, the valance band is partially filled and overlaps with an empty conduction band


    17. The forbidden energy gap between valance and conduction bands in semiconductors is upto :




    ... Answer is A. 1eV
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    18. When the temperature is increased, the conduction in the semiconductor material is




    ... Answer is B. Increase
    Semiconductors are conducting more at higher temperatures


    19. Which one of the following does not exhibit superconductivity?




    ... Answer is B. Copper
    Copper is the best conductor at room temperature


    20. Which one of the following is not a magnetic substance?




    ... Answer is C. Brass
    Brass is an alloy of zinc and copper, both are non-magnetic, so brass is non-magnetic


    21. Which substance has a relative permeability of less than 1?




    ... Answer is A. Diamagnetic
    --------------------------


    22. When diamagnetic material is placed in an external magnetic field, the direction of the field induced in the material is




    ... Answer is B. Opposite to the external direction field
    When diamagnetic material is placed in an applied external magnetic field H, a weak magnetic field B is induced in it. Which is not only less in magnitude but also in the opposite direction to that of the eternal magnetic field.


    23. The relative permeability of iron is




    ... Answer is D. 10⁴
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    24. Which substance shows a strong magnetic moment due to the cooperation of its atoms with each other?




    ... Answer is C. Ferromagnetic
    --------------------------------


    25.  The temperature at which the ferromagnetic substance becomes a paramagnetic substance is known as




    ... Answer is B. Curie temperature
    By Definition



26. When the area of the hysteresis loop is small, energy dissipation is




... Answer is A. Small
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