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Material Science MCQ Set 2

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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

Show Answer

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) 0.2โ€“0.6%
B) 2โ€“6%
C) 0.8โ€“1.5%
D) 1โ€“2%

Show Answer

Answer: B) 2โ€“6%
Explanation: Cast iron contains 2โ€“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

Show Answer

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

Show Answer

Answer: A) A ductile phase of steel
Explanation: Bainite has a fine microstructure and combines strength and toughness.

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