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ECAT Physics Of Solids Online Test

Maan AliLast Updated: April 18, 2025

Physics Of Solids MCQS Online Test

ECAT Physics Of Solids Chapter Online Test

Total Questions:	95
Time Allowed:	35 Minutes
Total Marks:	95
How to Attempt Test:	Please choose the right Option in MCQ-type question.
Test Helpful For:	ECAT Entry Test Physics Online Test Interview Questions about Physics All Universities Entrance Test Recruitments Tests

Page 1 of 4

1. What is the SI unit of modulus of elasticity of substance?

Nm¯²

Jm¯²

Nm¯¹

Being a number it has no unit.

2. Which one of the following physical quantities does not have the dimensions of force per unit area?

Stress

Strain

Young’s modulus

Pressure

3. A certain stress applied to an elastic material produces a certain strain in it. If the elastic limit is not exceeded the energy gained per unit volume of the material is given by

Stress/strain

(stress/strain)

Stress x strain

(Stress/strain)

4. The ration stress to strain in young’s modulus of the material then tension is

Directly proportional to extension

Directly proportional to strain

Directly proportional to square of amplitude

Inversely proportional to extension

5. A wire is stretched by a force F which causes an extension 1. The energy stored in the wire is

The extension of the wire is proportional to the force applied

The weight of the wire is negligible

The wire is not stretched beyond its elastic limit

The cross sectional area of the wire remains constant

6. Any alteration produced in shapes length or volume when a body is subjected to some external force is called

Stiffness

Toughness

Extension

Deformation

7. The breaking of crystals along definite direction is called

Cleavage

Symmetry

Isotropy

Homogeneity

8. If the density of atoms remain same along any direction in a crystal is called

Symmetry

Homogeneity

Isotropy

Cleavage

9. The energy band occupied by the valence electrons is called

Energy state

Valence band

Ve-energy state

Conduction band

10. Materials in which valence electrons are tightly bound to their atoms at low temperature are called

Semi conductor

Super conductor

Insulators

Conductor

11. The band theory of solids explains satisfactorily the nature of

Electrical insulators alone

Electrical conductors alone

Electrical semi-conductors alone

All of these

12. A vacant or partially filled band is called

Conduction band

Valence band

Forbidden band

Empty band

13. A completely filled band is called

Conduction band

Valence band

Forbidden band

Core band

14. The electrons in conduction band are free to

Transport vibrations

Transport signals

Transport charge

Transport impulses

15. Which one has the greatest energy gap?

Semi conductor

Conductor

Metals

None metals

16. With increase in temperature the electrical conductivity of intrinsic semi-conductor

Decreases

Increases

Remains same

First increases then decreases

17. Holes can exist in

Conductors

Insulators

Semi-conductors

All of these

18. On the basis of band theory of solids the semiconductors have

A party filled valence band and totally empty conduction band

A completely filled valence band a totally empty conduction band and a very wide forbidden band

A completely filled valence band a partially filled conduction and a narrow forbidden band

A partly filled valence band a totally empty conduction band and a wide forbidden band

19. In a semiconductors the charge carriers are

Holes only

Electrons only

Electron and holes both

All of these

20. Very weak magnetic fields are detected by

Squids

Magnetic resonance imaging (MRI)

Magnetometer

Oscilloscope

21. Energy needed to magnetize and demagnetize is represented by

Hysteresis curve

Hysteresis loop area

Hysteresis loop

Straight line

22. Polythene, polystyrene and nylon are examples of

Polymeric solids

Crystalline solids

Glassy solids

Amorphous solids

23. Crystalline solids have the properties such as

Regular arrangement

Covalent bonding

Some what defective

All of these

24. The whole structure obtained by the repetition of unit cell is known as

Unit cell

Crystal lattice

Crystal

All of these

25. The metals become electrically conducting due to their

Ductility

Hardness

Structure

All of these

Page 2 of 4

26. The measure of deformation of a solid when stress is applied to it is called

Strain

Stress

Force

None of these

27. The atoms molecules or ions in a crystalline solids are at room temperature

Motionless

Vibrate violently

Fixed

Simply vibrate

28. The ratio of applied stress to volumetric strain is called

Shear modulus

Young’s modulus

Bulk modulus

None of these

29. While vibrating the atoms are at their

Fixed positions

Extreme position

Average positions

None of these

30. In between two consecutive permissible energy bands, there is a range of energy states which cannot be occupied by electrons. These are called

Hidden energy states

Forbidden energy states

Band levels

None of these

31. At higher temperature their vibrations become so great that structure suddenly breaks up and changes into

Order to disorder

Solid into liquid

Melted

All of these

32. A substance which have empty conduction band is called

Conductor

Insulator

Semiconductor

None of these

33. Amorphous materials have the properties of solid like

No structure

Like liquid

Glassy

A and C

34. Arsenic, antimony or phosphorus are impurities for

p-type

n—type

may be p-type or n—type

None of these

35. The amorphous material (solids) have

No structure

No melting points

Partially crystalline solids

All of these

36. Polymeric solids have the structure

One dimensional

Two dimensional

Zero dimensional

Three dimensional

37. Unit cell has a basic structure of

One dimensional

Two dimensional

Three dimensional

None of these

38. In a semiconductor, the mobility of holes is

Greater than electrons

Less than electrons

Equal to electrons

None of these

39. The shape of crystals other than a cube have

Right angles

Not right angles

Not corners

None of these

40. How many oxygen atoms are in Yttrium barium copper oxide?

41. Examples of crystalline solids are

Copper

Zirconia

Iron

All of these

42. Polymers have chemically combinations with

Carbon

Nitrogen

Hydrogen

All of these

43. The deformation produced in the body by an applied force in their

Shape

Length

Volume

All of these

44. In forward bias, the width of potential barrier in a p-n junction diode

Increases

Decreases

Remains constant

First A and B

45. The ability of a body to return to its original shape when applied force is removed is called

Stress

Strain

Elasticity

All of these

46. Which of the following when added as a n impurity into the silicon produces n-type semi-conductor?

47. When a stress changes its length it is called

Stress

Tensile stress

Shear stress

None of these

48. Two inputs of NAND gates are shorted. This gate is equivalent to

OR gate

AND gate

NOT gate

XOR gate

49. When a stress change its shape it is called

Tensile stress

Shear stress

Volume stress

None of these

50. Which logic gate is represented by following diagram?

AND

NOR

EOR

Page 3 of 4

51. The measure of the deformation of a solid is called

Stress

Strain

Elastic constant

None of these

52. How many types of strain is

53. Nm¯² or Pa are the units of

Stress

Strain

Modulus of Elasticity

A and C

54. The energy band gap is maximum in

Metals

Superconductors

Insulators

Semiconductors

55. For three dimensional deformation l.e. volume deformation the bulk modulus is given by

56. Young’s modulus for aluminum is

100

57. When the output of OR gate is 1

If either of both inputs are 1

Only if both inputs are 1

If either input is zero

If both inputs are zero

58. Shear modulus for aluminum is

59. Young’s modulus for bass is

60. At absolute zero, SI acts as

Non-metal

Metal

Insulator

None of these

61. Shear modulus for brass is

62. In a junction diode, the holes are due to

Protons

Neutrons

Extra electrons

Missing of electrons

63. Bulk modulus for copper is

140

147

64. Young’s modulus for diamond is

700

913

1100

1120

65. The part of a transistor, which is heavily doped to produce a large number of majority carriers, is

Base

Emitter

Collector

None of these

66. Young’s modulus for lead is

67. Shear modulus for lead is

1.7

4.9

5.6

6.2

68. Bulk modulus for mercury is

29.4

69. The dimensional formula for the modulus of elasticity is same as that for:

Stress

Strain

Velocity

Surface tension

70. Steel is preferred for making springs over copper. Whey?

Steel is cheaper

Young’s modulus of steel is more than that of copper

Young’s modulus of copper is more than that of steel

Steel is less likely to be oxidized

71. The modulus of elasticity of a liquid is

Zero

Infinity

A value not one of these mentioned above

72. How does the Young’s modulus very with the increase of temperature?

Decrease

Increases

Remains constant

First increases and then decreases

73. A wire is stretched to double of its length. The strain is:

Zero

0.5

74. According to the Hooke’s law the force required to change the length of a wire by ‘I’ us proportional to:

l¯²

l¯¹

l²

75. For obtaining appreciable extension, the wire should be:

Short and thin

Long and thin

Short and tick

Long and thick

Page 4 of 4

76. A cable that can support a load W is cut into two equal parts. The maximum load that can be supported by either part is:

W/4

W/2

77. A cable breaks if stretched by more than 2 mm. It is cut into two equal parts. How much either part can be stretched without breaking?

0.25 m

0.5 m

1 mm

2 mm

78. Breaking load for unit area of cross-section of a wire is called:

Tensile strength

Ductibility

Yield point

Breaking stress

79. If both the length and radius of the wire are doubled, how does the modulus of elasticity change?

Becomes one fourth

Halved

Doubled

Remains unchanged

80. The fractional change in volume per unit increase in pressure is called:

Bulk modulus

Compressibility

Pressure coefficient

Volume coefficient

81. The whole structure obtained by the repetition of unit cell is known as

Unit cell

Crystal lattice

Ore

All of these

82. When a strength changes the length of a body it is called:

Tensile stress

Shear stress

Compress ional stress

None of these

83. The measure of deformation of a solid when stress is applied to it is called:

Strain

Stress

Force

None of these

84. The ratio of tensile stress to tensile strain is called

Modulus of electricity

Young’s modulus

Bulk’s modulus

None of these

85. The ratio of applied stress to volumetric strain is called

Shear modulus

Young’s modulus

Bulk modulus

None of these

86. The units of modulus of elasticity are same as that of

Stress

Strain

Force

None of these

87. Young’s modulus for copper is

70 x 10 Nm¯²

91 x 10 Nm¯²

110 Nm¯²

11 Nm¯²

88. In between two consecutive permissible energy bands, there is a range of energy states which cannot be occupied by electrons. These are called

Hidden energy states

Forbidden energy states

Band levels

None of these

89. The electrons in the outermost shell of an atom are called

Valence electrons

Tightly bound electrons

Free electrons

None of these

90. A substance which have empty conduction band is called

Conductor

Insulator

Semiconductor

None of these

91. In n-type substances, the minority carriers are

Holes

Electrons

Neutrons

None

92. Arsenic, antimony or phosphorus are impurities of

p-type

n—type

may be p-type or n—type

None of these

93. The critical temperature for mercury is

1.18 K

4.2 K

3.72 K

7.2 K

94. N—type crystal is

Neutral

Positively charged

Negative charged

None of these

95. In a semiconductor, the mobility of holes is

Greater than electrons

Less than electrons

Equal to electrons

None of these

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Maan AliLast Updated: April 18, 2025

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ECAT Physics Of Solids Online Test

Physics Of Solids MCQS Online Test

ECAT Physics Of Solids Chapter Online Test

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Physics Of Solids MCQS Online Test

ECAT Physics Of Solids Chapter Online Test

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