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Mechanical Engineering Objective Questions { Material Science }



8. Which of the following constituents of steels is softest and least strong
A.Austenite
B.Pearlite
C.Ferrite
D.Cementite

9. Ferromagnetic alpha iron exists in temperature range of
A.Below 723C
B.770-910C
C.910-1440C
D.1400-1539C

10. The number of electrons in 1 cm3 of metal would be of the order of
A.10^10
B.10^16
C.10^22
D.10^40

11. The ultimate tensile strength and yield strength of most of the metals, when temperature falls from 0 to -150C will
A.Increase
B.Decrease
C.Remain same
D.First increase and then decrease

12. Slow plastic deformation of metals under a constant stress is known as
A.Creep
B.Fatigue
C.Endurance
D.Plastic deformation

13. The ultimate tensile strength of low carbon steel by working at a high strain rate will
A.Decrease
B.Increase
C.Remain constant
D.First increase and then decrease

14. Mild steel belongs to the following category
A.Low carbon steel
B.Medium carbon steel
C.High carbon steel
D.Alloy steel

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