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Strength of Material MCQ Set 2

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STRENGTH OF MATERIAL MCQ SET 2

Q1. Which material has the highest elasticity?

A) Rubber
B) Steel
C) Copper
D) Brass

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Answer: B) Steel
Explanation: Steel has the highest modulus of elasticity, so itโ€™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

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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

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Answer: B) Hardness
Explanation: Hardness measures a materialโ€™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

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Answer: B) Impact test
Explanation: Charpy and Izod tests measure toughness โ€” 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) Poissonโ€™s ratio

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Answer: B) Volumetric strain
Explanation: Volumetric strain = ฮ”V / V.

Q6. The modulus of rigidity is also known as:

A) Youngโ€™s modulus
B) Shear modulus
C) Bulk modulus
D) Modulus of elasticity

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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

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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

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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

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Answer: A) Stress
Explanation: Since E = stress/strain, its unit is N/mยฒ (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

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Answer: B) Can be drawn into wire
Explanation: Ductility allows a material to undergo large plastic deformation in tension.


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