Engineering Materials MCQs

Question 1

Which of the following material has maximum ductility?

Accepted Answer

Mild steel

Answer

Copper

Answer

Nickel

Answer

Aluminium

Question 2

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

Accepted Answer

Hot hardness

Answer

Creep

Answer

Hot tempering

Answer

Fatigue

Question 3

The defect which takes place due to imperfect packing of atoms during crystallization is known as

Accepted Answer

Point defect

Answer

Line defect

Answer

Surface defect

Answer

None of these

Question 4

The alloy used for making electrical resistances and heating elements is

Accepted Answer

Nichrome

Answer

Invar

Answer

Magnin

Answer

Elinvar

Question 5

The strength is the ability of a material to resist

Accepted Answer

Externally applied forces with breakdown or yielding

Answer

Deformation under stress

Answer

Fracture due to high impact loads

Answer

None of these

Question 6

The stiffness is the ability of a material to resist

Accepted Answer

Deformation under stress

Answer

Fracture due to high impact loads

Answer

Externally applied forces with breakdown or yielding

Answer

None of the above

Question 7

Which of the following statement is wrong?

Accepted Answer

A mechanical mixture of 87% cementite and 13% ferrite is called pearlite

Answer

Steel with 0.8% carbon is wholly pearlite

Answer

The amount of cementite increases with the increase in percentage of carbon in iron

Answer

The cementite is identified as round particles in the structure

Question 8

Delta iron occurs at temperature of

Accepted Answer

Between 1400°C and 1539°C

Answer

Room temperature

Answer

Above melting point

Answer

Between 910°C and 1400°C

Question 9

Which of the following elements does not impart hardness to steel?

Accepted Answer

Copper

Answer

Chromium

Answer

Nickel

Answer

Silicon