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
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) Youngโs modulus
D) Poissonโs ratio
Answer: C) Youngโs modulus
Explanation: Youngโs 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)
Answer: A) Pascal (Pa)
Explanation: Stress = Force / Area = N/mยฒ = Pascal.
Q4. Hookeโs law is valid up to:
A) Limit of proportionality
B) Elastic limit
C) Yield point
D) Ultimate point
Answer: A) Limit of proportionality
Explanation: Hookeโs law states that stress โ strain within the proportional limit.
Q5.ย The ability of a material to resist deformation under load is known as:
A) Strength
B) Toughness
C) Hardness
D) Elasticity
Answer: A) Strength
Explanation: Strength determines how much load a material can bear without failure.
Q6.ย The ratio of lateral strain to longitudinal strain is:
A) Modulus of elasticity
B) Poissonโs ratio
C) Bulk modulus
D) Shear modulus
Answer: B) Poissonโs ratio
Explanation: Poissonโs ratio (ฮฝ) = Lateral strain / Longitudinal strain, typically 0.25โ0.35 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
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
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
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
Answer: B) Cup and cone fracture
Explanation: Mild steel shows necking and ductile failure forming a cup and cone shape.
Leave a Reply