1. The property of a body by virtue of which it regains its original shape after removing deforming force is called
A) Plasticity
B) Elasticity
C) Rigidity
D) Hardness
Answer: B) Elasticity
Explanation: Elasticity is the ability to return to the original shape once the external force is removed.
2. The inability of a body to regain its original shape after deformation is called
A) Plasticity
B) Elasticity
C) Brittleness
D) Ductility
Answer: A) Plasticity
Explanation: Plastic materials do not return to their original form after deformation.
3. The measure of elasticity of a material is known as
A) Modulus of elasticity
B) Elastic limit
C) Rigidity factor
D) Strength factor
Answer: A) Modulus of elasticity
4. The property of a material to resist a deforming force is
A) Stress
B) Strain
C) Elasticity
D) Rigidity
Answer: D) Rigidity
Explanation: Rigidity indicates resistance to deformation.
5. The point up to which a material returns to its original shape after removing force is called
A) Elastic limit
B) Breaking point
C) Yield point
D) Proportional limit
Answer: A) Elastic limit
6. Beyond the elastic limit, a material becomes
A) Plastic
B) Brittle
C) Elastic
D) Stronger
Answer: A) Plastic
Explanation: After the elastic limit, deformation becomes permanent.
7. The ratio of stress to strain within elastic limit is constant. This statement is known as
A) Hooke’s law
B) Pascal’s law
C) Archimedes’ principle
D) Bernoulli’s principle
Answer: A) Hooke’s law
8. The SI unit of modulus of elasticity is the same as that of
A) Pressure
B) Force
C) Energy
D) Power
Answer: A) Pressure
Explanation: Modulus of elasticity and pressure both have the same unit (force per unit area).
9. A material which can be stretched into a wire is said to be
A) Ductile
B) Malleable
C) Brittle
D) Elastic
Answer: A) Ductile
10. The property of being hammered into thin sheets is called
A) Malleability
B) Ductility
C) Brittleness
D) Elasticity
Answer: A) Malleability
11. The property of a material to resist breaking under tension is
A) Tensile strength
B) Elastic limit
C) Yield strength
D) Flexibility
Answer: A) Tensile strength
12. The breaking of a wire under tension depends on
A) Its material and diameter
B) Its length only
C) Its color
D) None of these
Answer: A) Its material and diameter
13. The materials that break suddenly without deformation are called
A) Brittle
B) Elastic
C) Ductile
D) Tough
Answer: A) Brittle
Explanation: Brittle materials fracture easily without much strain.
14. The materials which can be drawn into thin wires are called
A) Ductile
B) Malleable
C) Brittle
D) Elastic
Answer: A) Ductile
15. Which of the following is a ductile material?
A) Copper
B) Glass
C) Chalk
D) Coal
Answer: A) Copper
16. Which of the following is a brittle material?
A) Glass
B) Copper
C) Iron
D) Aluminium
Answer: A) Glass
17. The property of a material by which it can absorb energy and resist fracture is
A) Toughness
B) Hardness
C) Elasticity
D) Rigidity
Answer: A) Toughness
18. The ability of a body to resist permanent deformation is
A) Elasticity
B) Plasticity
C) Hardness
D) Creep
Answer: A) Elasticity
19. A steel spring returns to its original shape because of
A) Elasticity
B) Plasticity
C) Friction
D) Inertia
Answer: A) Elasticity
20. Rubber is less elastic than steel because
A) It does not regain shape fully
B) It deforms easily
C) It has weak intermolecular forces
D) All of these
Answer: D) All of these
21. A material that recovers its original dimensions quickly is said to have
A) High elasticity
B) Low elasticity
C) High viscosity
D) High density
Answer: A) High elasticity
22. The internal restoring force developed in a body under deformation is called
A) Stress
B) Strain
C) Force of friction
D) Rigidity
Answer: A) Stress
23. The change in dimension per original dimension under stress is called
A) Strain
B) Stress
C) Toughness
D) Elasticity
Answer: A) Strain
24. The stress at which a material just begins to flow is called
A) Yield stress
B) Elastic limit
C) Breaking stress
D) Shear stress
Answer: A) Yield stress
25. Beyond yield point, a material
A) Undergoes plastic deformation
B) Breaks immediately
C) Becomes perfectly elastic
D) Returns to original state
Answer: A) Undergoes plastic deformation
26. The maximum stress that a material can withstand is called
A) Breaking stress
B) Elastic stress
C) Yield stress
D) Normal stress
Answer: A) Breaking stress
27. The ratio of lateral strain to longitudinal strain is called
A) Poisson’s ratio
B) Elastic constant
C) Rigidity factor
D) Strain ratio
Answer: A) Poisson’s ratio
28. Poisson’s ratio is
A) Dimensionless
B) Has units of stress
C) Has units of strain
D) Has units of length
Answer: A) Dimensionless
29. When a wire is stretched, it becomes
A) Longer and thinner
B) Shorter and thicker
C) Longer and thicker
D) Shorter and thinner
Answer: A) Longer and thinner
30. In elastic materials, stress is directly proportional to
A) Strain
B) Density
C) Temperature
D) Pressure
Answer: A) Strain
31. The property by which an object resists twisting is
A) Rigidity
B) Elasticity
C) Flexibility
D) Ductility
Answer: A) Rigidity
32. Temporary deformation is known as
A) Elastic deformation
B) Plastic deformation
C) Permanent deformation
D) Creep
Answer: A) Elastic deformation
33. Permanent deformation is known as
A) Plastic deformation
B) Elastic deformation
C) Temporary strain
D) Reversible strain
Answer: A) Plastic deformation
34. The ability of a material to regain its shape after deformation is due to
A) Intermolecular forces
B) Inertia
C) Density
D) Temperature
Answer: A) Intermolecular forces
35. The stronger the intermolecular forces, the
A) Greater the elasticity
B) Lesser the elasticity
C) Greater the plasticity
D) Lower the rigidity
Answer: A) Greater the elasticity
36. The unit of stress and modulus of elasticity is the same because
A) Both involve force per area
B) Both involve volume
C) Both involve velocity
D) Both involve temperature
Answer: A) Both involve force per area
37. The elastic behavior of a solid is due to
A) Stretching of molecular bonds
B) Sliding of molecules
C) Breaking of bonds
D) Random motion of atoms
Answer: A) Stretching of molecular bonds
38. A rubber band shows
A) Elasticity
B) Plasticity
C) Rigidity
D) None
Answer: A) Elasticity
39. The best elastic material is
A) Steel
B) Copper
C) Aluminium
D) Rubber
Answer: A) Steel
Explanation: Steel regains its shape quickly and follows Hooke’s law accurately.
40. Rubber is elastic but not perfectly elastic because
A) It loses energy as heat
B) It is light
C) It is non-metallic
D) It is soft
Answer: A) It loses energy as heat
41. The elasticity of a wire depends on
A) Material of wire
B) Temperature
C) Length and thickness
D) All of these
Answer: D) All of these
Explanation: Elastic behavior varies with material type, dimensions, and temperature.
42. Elastic materials store energy when
A) Deformed
B) At rest
C) Heated
D) Rotated
Answer: A) Deformed
Explanation: Work done in deforming is stored as potential energy in the material.
43. Energy stored in an elastic body is called
A) Elastic potential energy
B) Mechanical energy
C) Strain energy
D) Work energy
Answer: A) Elastic potential energy
44. In which state of matter is elasticity most prominent?
A) Solids
B) Liquids
C) Gases
D) Plasma
Answer: A) Solids
Explanation: Solids strongly resist deformation due to strong molecular forces.
45. Liquids exhibit elasticity in
A) Volume
B) Shape
C) Length
D) None
Answer: A) Volume
Explanation: Liquids resist compression but easily change shape.
46. A perfectly elastic body
A) Regains its original shape completely
B) Regains partially
C) Never regains
D) Breaks after deformation
Answer: A) Regains its original shape completely
47. A perfectly plastic body
A) Never regains original shape
B) Regains partially
C) Behaves elastically
D) Expands permanently
Answer: A) Never regains original shape
48. Glass is an example of
A) Brittle substance
B) Elastic substance
C) Plastic substance
D) Ductile substance
Answer: A) Brittle substance
49. Steel wire is preferred for making springs because
A) It has high elasticity
B) It is light
C) It is cheap
D) It has low density
Answer: A) It has high elasticity
50. When a spring is stretched, the restoring force acts
A) Opposite to the deformation
B) Along deformation
C) Perpendicular to spring
D) Randomly
Answer: A) Opposite to the deformation
51. The elasticity of a material decreases when
A) Temperature increases
B) Temperature decreases
C) Pressure increases
D) Volume decreases
Answer: A) Temperature increases
52. A wire gets longer when stretched due to
A) Tensile stress
B) Compressive stress
C) Shear stress
D) Thermal stress
Answer: A) Tensile stress
53. A rod shortens when compressed due to
A) Compressive stress
B) Shear stress
C) Tensile stress
D) None
Answer: A) Compressive stress
54. When equal and opposite tangential forces act on a body, it produces
A) Shear stress
B) Longitudinal stress
C) Compressive stress
D) Normal stress
Answer: A) Shear stress
55. The temporary shape change that disappears after removing force is
A) Elastic deformation
B) Plastic deformation
C) Permanent deformation
D) None
Answer: A) Elastic deformation
56. A body that regains only part of its shape after deformation is called
A) Imperfectly elastic
B) Perfectly elastic
C) Plastic
D) Rigid
Answer: A) Imperfectly elastic
57. The ability of a metal to return to its original form is due to
A) Molecular forces
B) Gravitational forces
C) Magnetic forces
D) Electrical forces
Answer: A) Molecular forces
58. The elastic limit of steel is
A) Higher than that of rubber
B) Lower than that of rubber
C) Equal to that of rubber
D) Negligible
Answer: A) Higher than that of rubber
59. A wire remains elastic as long as
A) Stress does not exceed elastic limit
B) Stress is very large
C) It is thick
D) It is short
Answer: A) Stress does not exceed elastic limit
60. Elastic behavior of solids can be represented by
A) Stress-strain curve
B) Pressure-temperature graph
C) Volume-time graph
D) Force-distance graph
Answer: A) Stress-strain curve
61. In the initial part of stress-strain curve, stress is
A) Directly proportional to strain
B) Inversely proportional
C) Constant
D) Zero
Answer: A) Directly proportional to strain
62. The point beyond which strain increases without increase in stress is
A) Yield point
B) Elastic limit
C) Breaking point
D) Proportional limit
Answer: A) Yield point
63. The stress at which a wire breaks is
A) Breaking stress
B) Yield stress
C) Elastic stress
D) Shear stress
Answer: A) Breaking stress
64. The property of a body to resist volume change is measured by
A) Bulk modulus
B) Young’s modulus
C) Rigidity modulus
D) Poisson’s ratio
Answer: A) Bulk modulus
65. The property of a body to resist change in shape is measured by
A) Rigidity modulus
B) Young’s modulus
C) Bulk modulus
D) Plastic modulus
Answer: A) Rigidity modulus
66. The property of a body to resist change in length is measured by
A) Young’s modulus
B) Bulk modulus
C) Rigidity modulus
D) Plastic modulus
Answer: A) Young’s modulus
67. In liquids, only one modulus of elasticity is defined because
A) Liquids have no definite shape
B) Liquids cannot resist shear
C) Liquids flow under stress
D) All of these
Answer: D) All of these
68. For perfectly rigid bodies, elasticity is
A) Infinite
B) Zero
C) Maximum
D) Constant
Answer: A) Infinite
69. For perfectly plastic bodies, elasticity is
A) Zero
B) Infinite
C) Constant
D) Variable
Answer: A) Zero
70. The proportional limit is
A) The limit up to which stress and strain are proportional
B) The breaking point
C) The yield point
D) The elastic limit
Answer: A) The limit up to which stress and strain are proportional
71. The ability of a body to resist permanent deformation under stress is
A) Elasticity
B) Plasticity
C) Ductility
D) Toughness
Answer: A) Elasticity
72. The elasticity of rubber is due to
A) Stretching of long chain molecules
B) Density
C) Surface tension
D) Gravity
Answer: A) Stretching of long chain molecules
73. Elasticity depends upon
A) Nature of material
B) Temperature
C) Impurities
D) All of these
Answer: D) All of these
74. The spring balance works on the principle of
A) Elasticity
B) Pressure
C) Density
D) Magnetism
Answer: A) Elasticity
75. The greater the modulus of elasticity, the
A) Greater the stress required for same strain
B) Smaller the stress
C) Lower the elasticity
D) Easier deformation
Answer: A) Greater the stress required for same strain
76. Elastic fatigue means
A) Loss of elasticity due to repeated stress
B) Complete loss of elasticity
C) Permanent expansion
D) Sudden breakage
Answer: A) Loss of elasticity due to repeated stress
77. The materials used in bridges must have
A) High elasticity and high strength
B) Low elasticity and high weight
C) High density
D) Low rigidity
Answer: A) High elasticity and high strength
78. The ability to regain shape quickly after deformation is known as
A) Resilience
B) Plasticity
C) Rigidity
D) Brittleness
Answer: A) Resilience
79. The area under stress-strain curve represents
A) Work done per unit volume
B) Elastic limit
C) Strength
D) Density
Answer: A) Work done per unit volume
80. Elastic limit increases with
A) Decrease in temperature
B) Increase in temperature
C) Increase in volume
D) Increase in area
Answer: A) Decrease in temperature
81. A soft iron has
A) Low elasticity
B) High elasticity
C) Perfect elasticity
D) No elasticity
Answer: B) High elasticity
82. Elastic materials are used in
A) Springs
B) Balance instruments
C) Bridges
D) All of these
Answer: D) All of these
83. Perfectly elastic collision is one in which
A) No energy is lost
B) Energy is lost
C) Momentum is lost
D) Both are lost
Answer: A) No energy is lost
84. The property of glass fiber that makes it strong is
A) Elasticity
B) Plasticity
C) Density
D) Conductivity
Answer: A) Elasticity
85. The elastic behavior of solids is used in
A) Design of machines
B) Building construction
C) Measurement of force
D) All of these
Answer: D) All of these
86. Elastic limit decreases with
A) Increase in temperature
B) Decrease in temperature
C) Decrease in pressure
D) Increase in thickness
Answer: A) Increase in temperature
87. The unit of strain is
A) No unit
B) Same as stress
C) Same as force
D) Same as pressure
Answer: A) No unit
Explanation: Strain is a ratio; hence dimensionless.
88. The slope of stress-strain curve in elastic region gives
A) Modulus of elasticity
B) Density
C) Hardness
D) Weight
Answer: A) Modulus of elasticity
89. The deformation per unit length is called
A) Strain
B) Stress
C) Elastic limit
D) Tension
Answer: A) Strain
90. Steel is more elastic than rubber because
A) It recovers faster and completely
B) It is harder
C) It is denser
D) It is metallic
Answer: A) It recovers faster and completely
91. The elasticity of materials can be compared using
A) Modulus of elasticity
B) Density
C) Weight
D) Hardness
Answer: A) Modulus of elasticity
92. Modulus of elasticity is higher for
A) Metals
B) Rubber
C) Plastic
D) Wood
Answer: A) Metals
93. The stress beyond which a material breaks is known as
A) Breaking stress
B) Yield stress
C) Elastic stress
D) Shear stress
Answer: A) Breaking stress
94. A perfectly elastic body
A) Recovers total energy
B) Loses some energy
C) Stores heat
D) Gets permanently deformed
Answer: A) Recovers total energy
95. The property of a material which enables it to be rolled into sheets is
A) Malleability
B) Ductility
C) Elasticity
D) Rigidity
Answer: A) Malleability
96. In elasticity experiments, extension is directly proportional to
A) Load
B) Length
C) Temperature
D) Area
Answer: A) Load
97. When stress exceeds elastic limit, Hooke’s law
A) Fails
B) Holds good
C) Becomes stronger
D) Becomes linear
Answer: A) Fails
98. A perfect spring regains its shape completely after
A) Removal of load
B) Application of load
C) Heating
D) Cooling
Answer: A) Removal of load
99. Rubber has large elasticity because
A) Its molecules can stretch a lot
B) It is soft
C) It is light
D) It is dense
Answer: A) Its molecules can stretch a lot
100. The study of elasticity is useful in
A) Designing safe structures and machines
B) Making colors
C) Producing sound
D) Measuring time
Answer: A) Designing safe structures and machines