Materials and Construction MCQs

Question 1

Wood is corroded by

Accepted Answer

All of the above

Answer

Hydrochloric acid

Answer

SO 2 (dry or wet)

Answer

Chlorine (dry or wet)

Question 2

Work hardening of a material

Accepted Answer

Decreases its ductility

Answer

Decreases its tensile strength

Answer

Increases its ductility

Answer

Does not affect its ductility

Question 3

Wrought iron is

Accepted Answer

Malleable & ductile; and hence is used for chain links, hooks & couplings

Answer

High carbon iron

Answer

Highly resistance to acid corrosion

Answer

An alloy of iron, chromium & carbon

Question 4

Creep is not exhibited at low temperature by

Accepted Answer

Lead

Answer

Rubber

Answer

Acrylics

Answer

Plastics

Question 5

Silicon percentage in iron castings to have maximum hardness should be about

Accepted Answer

0.8

Answer

0.3

Answer

0.5

Answer

2.5

Question 6

Heavy duty bearings are usually made of

Accepted Answer

White metal

Answer

Phosphorous bronze

Answer

Monel

Answer

Zinc

Question 7

Rotary driers are generally made of

Accepted Answer

Mild steel

Answer

Cast iron

Answer

High silicon iron (14% Si)

Answer

Tin lined with refractory bricks

Question 8

Corrosion resisting properties of cast iron are significantly improved by the addition of 12 - 15% of

Accepted Answer

Silicon

Answer

Tungsten

Answer

Vanadium

Answer

All of the above

Question 9

Which metal is protected by the layer of its own oxide?

Accepted Answer

Aluminium

Answer

Iron

Answer

Silver

Answer

Calcium