Material Science MCQ Set 10
MATERIAL SCIENCE MCQ SET 10
Q1. Which property measures a material’s resistance to impact?
A) Hardness
B) Toughness
C) Ductility
D) Strength
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Answer: B) Toughness
Explanation: Toughness is measured using Charpy or Izod impact tests.
Q2. Which of the following is a non-ferrous metal?
A) Steel
B) Aluminum
C) Cast iron
D) Wrought iron
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Answer: B) Aluminum
Explanation: Non-ferrous metals do not contain significant iron content.
Q3. The cooling curve of steel is used to determine:
A) Hardness
B) Phase transformations
C) Density
D) Thermal conductivity
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Answer: B) Phase transformations
Explanation: Cooling curves show transformations like pearlite, bainite, and martensite.
Q4. White cast iron is hard because it contains:
A) Graphite
B) Cementite
C) Ferrite
D) Austenite
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Answer: B) Cementite
Explanation: Cementite (Fe₃C) is hard and brittle, giving white cast iron its hardness.
Q5. Which metal has HCP structure and is lightweight?
A) Magnesium
B) Iron
C) Copper
D) Aluminum
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Answer: A) Magnesium
Explanation: Magnesium is HCP, low density, and used in lightweight alloys.
Q6. Which of the following increases wear resistance?
A) Annealing
B) Carburization
C) Softening
D) Normalizing
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Answer: B) Carburization
Explanation: Carbon-rich surfaces formed during carburization resist wear.
Q7. Precipitation hardening is mainly used in:
A) Ferrous alloys
B) Aluminum alloys
C) Ceramics
D) Polymers
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Answer: B) Aluminum alloys
Explanation: Fine precipitates obstruct dislocation motion, strengthening alloys.
Q8. The crystal structure of copper is:
A) BCC
B) FCC
C) HCP
D) Simple cubic
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Answer: B) FCC
Explanation: Copper is FCC, giving high ductility and good electrical conductivity.
Q9. Nitriding increases:
A) Surface toughness
B) Surface hardness
C) Core hardness
D) Ductility
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Answer: B) Surface hardness
Explanation: Nitrogen forms hard nitrides, strengthening the surface layer.
Q10. Thermosetting polymers:
A) Can be reshaped by heating
B) Cannot be reshaped once set
C) Are flexible like rubber
D) Are metallic
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Answer: B) Cannot be reshaped once set
Explanation: Thermosets form permanent chemical bonds and retain shape on heating.