Material Science

1. The ability of material to resist softening at high temperature is known as

A) Creep
B) Hot tempering
C) Hot hardness
D) Fatigue

... Answer is C) Hot hardness

 

2. Slow plastic deformation of metal under a constant stress is known as

A) Creep
B) Fatigue
C) Endurance
D) none of the above

... Answer is A) creep
 

3.Resilience of material is important, when it is subjected to

A) Combined loading
B) fatigue
C) Thermal stresses
D) shock loading

... Answer is D)
shock loading
 

4.Delta iron occurs at temperature of

A) Room temperature
B) between 1400 ℃ and 1539 ℃
C) between 910 ℃ and 1400 ℃
D) None of the above

... Answer is B)
between 1400 ℃ and 1539 ℃

5. Railway rails are normally made of

A) Mild steel
B) alloy steel
C) High carbon steel
D) Tungsten steel

... Answer is C)
High carbon steel

 

6. Elasticity of various materials is controlled by

A) Ultimate tensile stress
B) Proof stress
C) Stress at yield point
D) Stress at elastic limit

... Answer is D)
Stress at elastic limit
 

7. A material capable of absorbing large amount of energy before fracture is known as

A) Ductility
B) Toughness
C) Resilience
D) Plasticity

... Answer is B) Toughness

 

8. Which of the following constituents of steel is softest and least strong ?

A) Ferrite
B) Austenite
C) Pearlite
D) Cementite

... Answer is A) Ferrite

 

9.Which of the following is used as bearing liner ?

A) Gun metal
B) Bronze
C) Brass
D) Babbit metal

... Answer is D)
Babbit metal
 

10. A steel is specified as En 42. This is as per following standard

A) French
B) American
C) British
D) Japanese

... Answer is C) British

11. . Malleability of a material can be defined as

A) Ability to undergo large permanent deformation in compression
B) Ability to recover it's original form
C) Ability to undergo large elastic deformation in tension
D) all of the above

... Answer is A) Ability to undergo large permanent deformations in compression