Materials and Construction MCQs

Question 1

Nickel (76%) and chromium (15%) alloys are termed as

Accepted Answer

Inconel

Answer

Monel

Answer

Aluminium bronzes

Answer

Brass

Question 2

Karbate is

Accepted Answer

Both B and C

Answer

A mixture of iron dust and saw dust

Answer

Carbon impregnated with resin (usually bakelite)

Answer

An acid resistant material

Question 3

Kel-F is a material, which is

Accepted Answer

All of the above

Answer

Chemically known as polychlorotrifluor-oethylene (PTFE)

Answer

Having excellent chemical & high temperature resistance (upto 200°C)

Answer

Having elastomeric properties

Question 4

A chemical change takes place when iron

Accepted Answer

Rusts

Answer

Melts

Answer

Is heated

Answer

None of these

Question 5

Addition of 2% nickel in steel makes it suitable for making

Accepted Answer

Boiler plates, rivets etc

Answer

Electronic valves

Answer

Turbine blades

Answer

Connecting rod

Question 6

Which of the following materials may prove unsuitable for handling acetic acid (glacial & anhydrous) at 40°C?

Accepted Answer

Brass, cast iron, mild steel and tin

Answer

Silicone rubber, teflon, procelain and wood

Answer

Nickel, monel, stainless steel and graphite

Answer

Aluminium, copper, high silicon iron

Question 7

Cold work tool steel should have

Accepted Answer

High wear resistance

Answer

High toughness

Answer

Poor hardenability

Answer

All of the above

Question 8

Pick out the wrong statement.

Accepted Answer

Ungsten has a body centred cubic (bcc) crystal lattice structure

Answer

Etal/alloys having hexagonal crystal lattice structure are less malleable than those having cubic crystal lattice structure

Answer

Etal/alloys having body centred cubic (bcc) crystal lattice structure is stronger & less ductile than those having face centred cubic (fcc) crystal lattice structure

Answer

Oth ferritic & austenitic stainless steel has a face centred cubic (fcc) crystal structure

Question 9

The softest material in Mho's scale (for measuring hardness) is

Accepted Answer

Talc

Answer

Gypsum

Answer

Rubber

Answer

None of these