# 12th Class Physics Mcqs Chapter no 17 | Physics Mcqs For Class 12th Mcqs 2021 with answers pdf

Moreover from this platform you are able to physics solved mcqs pdf free download and if you want to test your self or want to take any quiz related to these chapters then you are also able to take 2nd year physics chapter wise test pdf

Chapter 17

Physics of Solids

Encircle the most appropriate answer among the following options

1.         Polymer solids are choose which one is correct:

(a) Order solids

(b) Disorder solids

(c) In b/w order and disorder

(d) Neither type

2.         Crystalline solids are choose which one is correct:

2.         Crystalline solids are choose which one is correct:

(a) Order solid

(b) Disorder solid

(c) In b/w order and disorder

(d) All of above

3.         Amorphous solids are choose which one is correct:

(a) Order solid

(b) Disorder solid

(c) In b/w order and disorder

(d) None of the above

4.         Amorphous solid are also called choose which one is correct:

(a) Crystalline solid

(b) Glassy solid

(c) Soft solid

(d) Hard solid

5.         Crystalline solid have choose which one is correct:

(a) Definite melting point

(b) Indefinite melting point

(c) In between

(d) None of above

6.         The solids are classified as choose which one is correct:

(a) Polymeric

(b) Amorphous

(c) Crystalline

(d) All of above

7.         Each atom in a crystalline vibrates about a fixed point with an amplitude that choose which one is correct:

(a) Increases with rise in temperature

(b) Decreases with rise in temperature

(c) Remains the same with rise in temperature

(d) None of these

8.         The transition from solid state to liquid state is actually from choose which one is correct:

(a) Order to order

(b) Disorder to order

(c) Order to disorder

(d) None of these

9.         The force which maintains the long-range order between atoms of crystalline solid is called choose which one is correct:

(a) Gravitational force

(b) Nuclear force

(c) Coulomb’s force

(d) Cohesive force

10.       The word amorphous means choose which one is correct:

(a) With definite structure

(b) Without any structure

(c) Regular arrangement of atoms

(d) None of these

11        An ordinary glass gradually softness into a paste like state before it becomes a very viscous liquid which is possible at choose which one is correct:

(a) 9000C

(b) 6000C

(c) 8000C

(d) 1000C

12.       A unit cell is the smallest basic structure which is choose which one is correct:

(a) Two dimensional

(b) One dimensional

(c) Three dimensional

(d) None of these

13.       The temperature at which the vibrations becomes so great that the structure of the crystal breaks is called choose which one is correct:

(a) Melting point

(b) Critical temperature

(c) Boiling point

(d) None of these

14.       The whole structure obtained by the repetition of unit cell is called choose which one is correct:

(a) Crystalline solid

(b) Amorphous solid

(c) Polymeric solid

(d) Crystal lattice

15.       Examples of polymeric solids are choose which one is correct:

(a) Plastic

(b) Zirconia

(c) NaCl

(d)   Copper

16.       Examples of crystalline solids are choose which one is correct:

(a) Copper

(b) NaCl

(c) Zirconia

(d) All of above

17.       The substance among the following which breaks after the elastic limit is called choose which one is correct:

(a) Brittle

(b) Organic

(c) Ductile

(d) All of above

18.       Ordinary glass becomes a very viscous liquid at choose which one is correct:

(a) 600oC

(b) 800oC

(c) 300oC

(d) 100oC

19.       Artificial polymers are made by a chemical reaction known as choose which one is correct:

(a) Polymerization

(b) Polarization

(c) Electroplating

(d) All of the above

20.       Which of the following are mechanical properties of a material choose which one is correct:

(a) Ductility

(b) Strength

(c) Stiffness

(d) All of the above

21.       The ratio of stress to strain is called choose which one is correct:

(a) Modulus of elasticity

(b) Young’s modulus

(c) Bulk modulus

(d) All of the above

22.       The ratio of applied stress to tensile strain is called choose which one is correct:

(a) Bulk modulus

(b) Young modulus

(c) Shear modulus

(d) None of the above

23.       The ratio of the applied stress to volume strain is called choose which one is correct:

(a) Bulk modulus

(b) Young modulus

(c) Shear modulus

(d) None of the above

24.       The ratio of the applied stress to shear strain is called choose which one is correct:

(a) Bulk modulus

(b) Young modulus

(c) Shear modulus

(d) None of the above

25.       The prosperity of a material to return to its original shape and size on the removal of strain is called choose which one is correct:

(a) Elasticity

(b) Strain

(c) Plasticity

(d) None of the above

26.       When a body is subjected to some external force, deformation is produced in choose which one is correct:

(a) Shape

(b) Length

(c) Volume

(d) Any of these

27.       The results of mechanical tests are usually expressed in terms of choose which one is correct:

(a) Strain

(b) Stress

(c) Applied force

(d) All of above

28.       When the stress changes length of a body, it is called choose which one is correct:

(a) Tensile strain

(b) Shear strain

(c) Volumetric strain

(d) None of these

29.       When the stress changes the shape of the body it is called choose which one is correct:

(a) Tensile strain

(b) Shear strain

(c) Volumetric strain

(d) None of these

30.       When the stress changes the volume of the body, it is called choose which one is correct:

(a) Tensile strain

(b) Shear strain

(c) Volumetric strain

(d) None of these

31.       A stress which decreases the length along one dimension is known as choose which one is correct:

(a) Compressive stress

(b) Tensile stress

(c) Linear stress

(d) None of these

32.       Bulk Modulus is involved when the deformation is choose which one is correct:

(a) Two dimensional

(b) Three dimensional

(c) One dimensional

(d) None of these

33.       For practical purposes, the proportional limit for ductile material is choose which one is correct:

(a) Smaller than elastic limit

(b) Greater than elastic limit

(c) Identical to the elastic limit

(d) None of these

34. When the specimen does not recover its original shape after the stress is removed, its behaviour is called choose which one is correct:

(a) Ductility

(b) Deformation

(c) Plasticity

(d) Elasticity

35.       Yield stress is another name of choose which one is correct:

(a) Plasticity

(b) Proportional limit

(c) Elastic limit

(d) Both (b) and (c)

36.       The ultimate tensile strength (UTS) is the choose which one is correct:

(a) Maximum strength that a material can with stand

(b) Minimum strength

(c) Minimum strength that a material can withstand

(d) Both (a) and (c)

37.       Once the stress is increased than UTS, the material falls into the region of choose which one is correct:

(a) Fracture stress

(b) Elastic limit

(c) Proportional limit

(d) None of these

38.       A steel wire 20 mm in diameter is stretched by a force of 1 13 N. The tensile stress applied is choose which one is correct:

(a) 1 MPa

(b) 10-6,N/m2

(c) 0.1 MPa

(d) 0.2 x 106 P

39.       The area method for finding strain energy is useful for choose which one is correct:

(a) Linear part

(b) Non-elastic part

(c) Linear part of the force-extension graph

(d) None Of these

40.       The strain energy in a deformed wire is actually the gain in the choose which one is correct:

(a) Kinetic energy of its molecules

(b) Potential energy of its molecules

(c) K.E and P.E of the its molecules

(d) Gravitational P.E of its molecules

41.       The force applied on a unit area to produce any change in shape, volume and length is called choose which one is correct:

(a) Stress

(b) Strain

(c) Elasticity

(d) Plasticity

42.       Hook’s law states that the strain is directly proportional to choose which one is correct:

(a) Power

(b) Shear

(c) Force

(d) Energy

43.       Molecules of a solid possess choose which one is correct:

(a) Rotatory motion

(b) Vibratory motion

(c) Circular motion

(d) Translatory motion

44.       Force applied on a unit area is called choose which one is correct:

(a) Strain

(b) Stress

(c) Elasticity

(d) Fracture strain

45.       The SI unit of stress is choose which one is correct:

(a) N-S

(b) N-m2

(c) N-m

(d) N

46.       A stress which changes one dimension only is choose which one is correct:

(a) Linear strain

(b) Linear stress

(c) Elasticity

(d) None of the above

47.       The dimension of stress is choose which one is correct:

(a) [MLT-1 ]

(b) [ML-1T]

(c) [ML-1W-1]

(d) [ML-1T2.]

48.       The dimension of strain is choose which one is correct:

(a) [L]

(b) [LT-1]

(c) [L-1]

(d) Dimension less

49.       The maximum stress which a body can bear is choose which one is correct:

(a) Plastic stress

(b) Elastic stress

(c) UTS

(d) None Of the above

50.       What type of impurity is to be added to the semi conductor material to provide hole choose which one is correct:

(a) Pentavalent

(b) Trivalent

(c) Monovalent

(d)  None of these

51.       The extension produced in a sample of material depends upon choose which one is correct:

(a) Area

(b) Force

(c) Nature of material

(d) All Of the above

52.       Super conductors are used in choose which one is correct:

(a) Magnetic Levitation train

(b) Fast computer chip

(c) Magnetic resonance imaging

(d) All of the above

53.       Semi conductor is one which has choose which one is correct:

(a) Large conductivity

(b) Less conductivity

(c) Zero conductivity

(d) Intermediate conductivity

54.       On doping, the conductivity of the semi conductor choose which one is correct:

(a) Remains constant

(b) Increases

(c) Decreases

(d) None of the above

55.       A solid that is intermediate between order and disorder is called choose which one is correct:

(a) Polymeric solids

(b) Glassy solid

(c) Amorphous solids

(d) None of these

56.       Materials have specific uses depending upon their characteristics and properties such as choose which one is correct:

(a) Hardness

(b) Conducting or magnetic

(c) Ductility

(d) All of above

57.       Example of polymeric solid choose which one is correct:

(a) Polythene

(b) Plastic

(c) Nylon

(d) All of above

58.       Whole structure of solid obtain by the repetition of unit cells is called choose which one is correct:

(a) Polymer

(b) Crystal lattice

(c) Amorphous

(d) None of these

59.       Measure of deformation of body with application of stress is called choose which one is correct:

(a) Rigidity

(b) Modulus of elasticity

(c) Elasticity

(d) Strain

60.       If a material sets up a magnetic field which opposes the applied magnetic field it is said to be choose which one is correct:

(a) Electromagnetic

(b) Diamagnetic

(c) Paramagnetic

(d) None of these

61.       Solids with high value of conductivity are called choose which one is correct:

(a) Conductors

(b) Semi-conductors

(c) Insulators

(d) Plasticity

62.       Any change produced in shape, volume or length when a body is subjected some external force is called choose which one is correct:

(a) Yield point

(b) Elastic limit

(c) Deformation

(d) Plasticity

63.       Modulus of elasticity of material is choose which one is correct:

(a) Strain

(b) Stress

(c) Stress x Strain

(d) None of these

64.       The value of stress beyond which the body is permanently deformed will be known as choose which one is correct:

(a) Mini-stress

(b) Yield stress

(c) Maxi-stress

(d) None of these

65.       The domain theory Of magnet is important to explain the behaviour of choose which one is correct:

(a) Diamagnets

(b) Paramagnets

(c) Ferromagnets

(d) All of these

66.       A pentaralent impurity in Si choose which one is correct:

(a) a free electron and a free hole

(b) a free hole

(c) a free electron

(d) No free particle

67.       The substances which have partially filled conduction bands are called choose which one is correct:

(a) Conductors

(b) Insulator

(c) Semi-conductor

(d)        Super Conductor

68.       A conduction band is always choose which one is correct:

(a) Partially filled

(b) Complete filled

(c) Partially empty

(d) Empty

69.       The conduction band lies choose which one is correct:

(a) Inside the valance band

(b) Below valance band

(c) Above valance band

(d) None of these

70.       The electrons occupying by conduction band are choose which one is correct:

(a) Free electrons

(b) Valance electrons

(c) Conductive electrons

(d) All of above

71.       The band below the valance band is choose which one is correct:

(a) Empty band

(b) Partially filled band

(c) Completely filled band

(d) All of above

72.       The theory failed to explain the complete electric behaviour of solid choose which one is correct:

(a) Rutherford’s theory

(b) Newton’s theory

(c) Bohr’s theory

(d) None of the above

73.       The examples of conductors are choose which one is correct:

(a) Copper

(b) Diamond

(c) Wood

(d) Germinium

74.       The examples of insulators are choose which one is correct:

(a) Diamond

(b) Wood

(c) Zinc

(d) Both (a) and (b)

75.       Valence band choose which one is correct:

(a) Contains valence electron

(b) Contains no valence electron

(c) Highest occupied band

(d) Lowest occupied band

76.       Valence band may be choose which one is correct:

(a) Completely filled

(b) Partially filled

(c) Both (a) and (b)

(d) None of these

77.       Conduction band may be choose which one is correct:

(a) Partially filled with electrons

(b)        Empty

(c) Not empty

(d) None of these

behaviour choose which one is correct:

78.       Those materials in which valence and conduction bands are overlap each other are called choose which one is correct:

(a) Conductors

(b) Insulators

(c) Semi-conductors

(d) None of these

79.       Partially filled conduction and valence bands with a very narrow forbidden energy gap in between them shows the choose which one is correct:

(a) Conductors

(b) Insulators

(c) Semi-conductors

(d) None of these

80.       When a battery is connected to a semi-conductor, the current passes through it is due to choose which one is correct:

(a) Electrons and holes

(b) Protons and holes

(c) Electrons

(d) Holes

81.       On introducing a small amount of impurity into a pure semi-conductor, its electrical behaviour choose which one is correct:

(a) does not change

(b) is changed

(c) is changed very small

(d) is changed very large

82.       To form an N-type semi-conductor, silicon crystal is doped with choose which one is correct:

(a) Penta valent element

(b) Trivalent element

(c) Both (a) and (b)

(d) None of these

83.       An example of donor impurity is choose which one is correct:

(a) Phosphorus

(b) Indium

(c) Boron

(d) Gallium

84.       To form a P-type semi-conductor, silicon is doped with choose which one is correct:

(a) Germanium

(b) Arsenic

(c) Indium

(d) Antimony

85.       An example of acceptor impurity is choose which one is correct:

(a) Phosphorus

(b) Indium

(c) Arsenic

(d)        Silicon

86.       An P-type substance is choose which one is correct:

(a) Neutral

(b) Positively charged

(c) Negatively charged

(d) None of these

87.       An N-type substance is choose which one is correct:

(a) Neutral

(b) Positively charged

(c) Negatively charged

(d) None of these

88.       Conductors have choose which one is correct:

(a) Partially filled valance band

(b) Partially filled conduction band

(c) Narrow forbidden gap

(d) All of above

89.       The doped semi-conducting materials are called choose which one is correct:

(a) Superconductors

(b) Poor semi conductors

(c) Pure semi conductors

(d) Extrinsic semi conductors

90.       When a Germanium is doped with pentavalent impurity, the doped semi conductor is choose which one is correct:

(a) p-type

(b) n-type

(c) Both (a) and (b)

(d) None of the above

91.       When a covalent bond is broken in a doped semi conductor choose which one is correct:

(a) An electron is created

(b) A proton and electron are created

(c) A hole is created

(d) A pair of hole and electron are created

92.       The material whose resistivity becomes zero below a certain temperature choose which one is correct:

(a) Conductors

(b) Semi conductors

(c) Super conductors

(d) Insulators

93.       The energy band occupying valance electrons is known as choose which one is correct:

(a) Conductive electrons

(b) Valance electrons

(c) Free electrons

(d) Both (a) and (c)

94.       The energy band occupying free electrons is called choose which one is correct:

(a) Conduction band

(b) Valance band

(c) Forbidden gap

(d) None of these

95.       An example of an intrinsic semi conductor is choose which one is correct:

(a) Al

(b) Ge

(c) Cb

(d) Ph

96.       An example of an extrinsic semi conductor is choose which one is correct:

(a) Si

(b) ph

(c) Al

(d) Both (b) and (c)

97.       The supper conductor was discovered by choose which one is correct:

(a) Lenz

(b) Orested

(c) Kmaerlingh ornes

98.       The first super conductor was discovered in choose which one is correct:

(a) 1923

(b) 1917

(c) 1905

(d) 1911

99.       The resistance of mercury becomes zero at the temperature choose which one is correct:

(a) Below 4.2 K

(b) to 4.2 K

(c) Above 4.2 K

(d) None of these

100.     A new class of ceramic materials was discovered in choose which one is correct:

(a) 1986

(b) 1978

(c) 1938

(d) 1958