Strength of Material MCQ Set 2
STRENGTH OF MATERIAL MCQ SET 2
Q1. Which material has the highest elasticity?
A) Rubber
B) Steel
C) Copper
D) Brass
Show Answer
Answer: B) Steel
Explanation: Steel has the highest modulus of elasticity, so it’s most elastic, not rubber.
Q2. The point where stress-strain curve deviates from a straight line is:
A) Elastic limit
B) Proportional limit
C) Yield point
D) Ultimate point
Show Answer
Answer: B) Proportional limit
Explanation: Up to this point, stress is directly proportional to strain.
Q3. Which property indicates resistance to scratching or indentation?
A) Toughness
B) Hardness
C) Strength
D) Elasticity
Show Answer
Answer: B) Hardness
Explanation: Hardness measures a material’s resistance to surface deformation.
Q4. Toughness of a material is measured by:
A) Hardness test
B) Impact test
C) Fatigue test
D) Compression test
Show Answer
Answer: B) Impact test
Explanation: Charpy and Izod tests measure toughness — energy absorbed before fracture.
Q5. The ratio of change in volume to original volume is called:
A) Shear strain
B) Volumetric strain
C) Longitudinal strain
D) Poisson’s ratio
Show Answer
Answer: B) Volumetric strain
Explanation: Volumetric strain = ΔV / V.
Q6. The modulus of rigidity is also known as:
A) Young’s modulus
B) Shear modulus
C) Bulk modulus
D) Modulus of elasticity
Show Answer
Answer: B) Shear modulus
Explanation: It relates shear stress to shear strain.
Q7. The total deformation per unit length under load is:
A) Stress
B) Strain
C) Modulus
D) Elasticity
Show Answer
Answer: B) Strain
Explanation: Strain = (Change in length) / (Original length).
Q8. Which material property is most important for springs?
A) Ductility
B) Elasticity
C) Hardness
D) Brittleness
Show Answer
Answer: B) Elasticity
Explanation: Springs must return to their original shape after deformation.
Q9. The unit of modulus of elasticity is the same as:
A) Stress
B) Strain
C) Force
D) Length
Show Answer
Answer: A) Stress
Explanation: Since E = stress/strain, its unit is N/m² (same as stress).
Q10. A ductile material is one that:
A) Breaks easily
B) Can be drawn into wire
C) Absorbs little energy
D) Is hard and brittle
Show Answer
Answer: B) Can be drawn into wire
Explanation: Ductility allows a material to undergo large plastic deformation in tension.