Strength of Material MCQ Set 1

STRENGTH OF MATERIAL MCQ SET 1

Q1. The property of a material by which it can regain its original shape after deformation is called:

A) Plasticity
B) Elasticity
C) Ductility
D) Toughness

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Answer: B) Elasticity
Explanation: Elasticity is the property that allows a material to return to its original dimensions after removal of load.

Q2. The ratio of stress to strain within elastic limit is called:

A) Bulk modulus
B) Rigidity modulus
C) Young’s modulus
D) Poisson’s ratio

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Answer: C) Young’s modulus
Explanation: Young’s modulus (E = stress/strain) defines the stiffness of a material in tension or compression.

Q3. The unit of stress is:

A) Pascal (Pa)
B) Newton (N)
C) Meter (m)
D) Joule (J)

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Answer: A) Pascal (Pa)
Explanation: Stress = Force / Area = N/m² = Pascal.

Q4. Hooke’s law is valid up to:

A) Limit of proportionality
B) Elastic limit
C) Yield point
D) Ultimate point

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Answer: A) Limit of proportionality
Explanation: Hooke’s law states that stress ∝ strain within the proportional limit.

Q5. The ability of a material to resist deformation under load is known as:

A) Strength
B) Toughness
C) Hardness
D) Elasticity

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Answer: A) Strength
Explanation: Strength determines how much load a material can bear without failure.

Q6. The ratio of lateral strain to longitudinal strain is:

A) Modulus of elasticity
B) Poisson’s ratio
C) Bulk modulus
D) Shear modulus

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Answer: B) Poisson’s ratio
Explanation: Poisson’s ratio (ν) = Lateral strain / Longitudinal strain, typically 0.25–0.35 for metals.

Q7. The stress at which a material begins to deform permanently is called:

A) Elastic limit
B) Yield stress
C) Ultimate stress
D) Breaking stress

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Answer: B) Yield stress
Explanation: Yield stress marks the start of plastic deformation.

Q8. The maximum stress a material can withstand before failure is:

A) Ultimate stress
B) Tensile stress
C) Elastic stress
D) Shear stress

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Answer: A) Ultimate stress
Explanation: Ultimate stress represents the peak value on a stress-strain curve.

Q9. Strain has:

A) Units of length
B) Units of force
C) No units
D) Units of stress

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Answer: C) No units
Explanation: Strain is a ratio of two lengths, so it is dimensionless.

Q10. A mild steel specimen fails under tension by:

A) Brittle fracture
B) Cup and cone fracture
C) Shear fracture
D) Fatigue fracture

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Answer: B) Cup and cone fracture
Explanation: Mild steel shows necking and ductile failure forming a cup and cone shape.