Material Science MCQ Set 2
MATERIAL SCIENCE MCQ SET 2
Q1. The TTT diagram is used for:
A) Determining elastic modulus
B) Time-temperature transformation of steel
C) Electrical conductivity measurement
D) Magnetic property analysis
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Answer: B) Time-temperature transformation of steel
Explanation: TTT diagrams help predict phases formed at different cooling rates.
Q2. Ceramics are generally:
A) Ductile
B) Brittle
C) Magnetic
D) Soft
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Answer: B) Brittle
Explanation: Ceramics have strong ionic/covalent bonds, making them hard but brittle.
Q3. The main constituent of bronze is:
A) Copper and Zinc
B) Copper and Tin
C) Aluminum and Copper
D) Iron and Carbon
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Answer: B) Copper and Tin
Explanation: Bronze is a copper-tin alloy used for bearings, coins, and sculptures.
Q4. Ductility is measured by:
A) Hardness test
B) Tensile test
C) Impact test
D) Fatigue test
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Answer: B) Tensile test
Explanation: Percent elongation and reduction in area in a tensile test indicate ductility.
Q5. The percentage of carbon in cast iron is:
A) 0.2–0.6%
B) 2–6%
C) 0.8–1.5%
D) 1–2%
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Answer: B) 2–6%
Explanation: Cast iron contains 2–6% carbon, making it hard and brittle.
Q6. Which of the following increases the hardness of steel?
A) Annealing
B) Quenching and tempering
C) Normalizing
D) Cold working
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Answer: B) Quenching and tempering
Explanation: Quenching produces martensite, and tempering reduces brittleness while maintaining hardness.
Q7. The hexagonal close-packed (HCP) metals include:
A) Iron and Nickel
B) Copper and Aluminum
C) Zinc and Magnesium
D) Gold and Silver
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Answer: C) Zinc and Magnesium
Explanation: HCP metals have limited slip systems, making them less ductile.
Q8. The property of metals to be drawn into wires is called:
A) Ductility
B) Malleability
C) Toughness
D) Hardness
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Answer: A) Ductility
Explanation: Ductile materials can be stretched into wires without fracture.
Q9. Annealing of steel is done to:
A) Increase hardness
B) Reduce hardness and improve ductility
C) Increase brittleness
D) Produce martensite
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Answer: B) Reduce hardness and improve ductility
Explanation: Annealing softens steel, making it easier to machine or form.
Q10. Bainite is:
A) A ductile phase of steel
B) A hard and brittle phase
C) Same as pearlite
D) A non-metallic inclusion
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Answer: A) A ductile phase of steel
Explanation: Bainite has a fine microstructure and combines strength and toughness.