GATE Material Science Objective Questions

Material Science : Objective Questions

1. Eutectoid reaction occurs at-

A. 114 °C

B. 600 °C

C. 727 °C

D. 1493 °C

View Answer/Explanation

Correct Answer is C

2. Machines tool guide-ways are usually hardness by-

A. Mar-tempering

B. Flame hardening

C. vacuum hardening

D. induction hardening

View Answer/Explanation

Correct Answer is B

3. 18/8 stainless steel contains-

A. 18% nickel & 8% chromium

B. 18% chromium & 8% nickel

C. 18% tungsten & 8% chromium

D. 18% stainless & 8% chromium

View Answer/Explanation

Correct Answer is B

It is also called Austentic stainless steel, and is magnetic in nature.

4. Which one of the following features improves the fatigue strength of a metallic material-

A. Increasing the temperature

B. Scratching the surface

C. Over stressing

D. Under stressing

View Answer/Explanation

Correct Answer is D

Under compressive stress, fatigue life is improved.

5. Gibbs phase rule is given by-

A. F = C + P

B. F = C – P + 2

C. F = C + P – 2

D. F = C – P – 2

View Answer/Explanation

Correct Answer is B

P + F = C + 2

where,

P = N0. of phase

F = No. of degree of freedom

C = No. of components

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