Materials and Construction MCQs

Question 1

The presence of impurities in iron

Accepted Answer

Decreases its melting point

Answer

Increases its melting point

Answer

Does not affect its melting point

Answer

Makes it malleable

Question 2

Presence of nitrogen in steel

Accepted Answer

Makes it brittle

Answer

Increases its strength

Answer

Increases its hardness

Answer

Is desirable

Question 3

Presence of silicon in steel

Accepted Answer

Decreases the blow holes formation tendency in castings

Answer

Is in the form of free Si

Answer

Indicates that steel is not deoxidised properly

Answer

None of these

Question 4

Carbon is present in steel wholly in the

Accepted Answer

Combined form

Answer

Free state as graphite

Answer

Both A & B

Answer

Neither A nor B

Question 5

Hastelloy C is a good material of construction in chemical process industry, since it is

Accepted Answer

Light and resists attack by acids

Answer

Highly corrosion resistant and is readily fabricated

Answer

Relatively inexpensive although it can be fabricated with some difficulty

Answer

Corrosion resistant to most alkalis, particularly because of its coper content

Question 6

Spray dryer for evaporating milk to produce milk powder is made of

Accepted Answer

Stainless steel

Answer

Lead lined steel

Answer

Aluminium

Answer

Cast iron

Question 7

Pure nickel is

Accepted Answer

Ferromagnetic at room temperature

Answer

Ferromagnetic above its curie point (i.e., 415°C)

Answer

Having h.c.p. crystal lattice

Answer

Not resistant to oxidation at high temperature

Question 8

Aluminium alloy is one of the most suitable materials of construction for aircrafts mainly due to its

Accepted Answer

High strength to weight ratio

Answer

Low temperature strength properties

Answer

Its ability to be cast, rolled, forged & stamped

Answer

High strength and corrosion & oxidation-resistance at elevated temperature

Question 9

Babbit metal used for bearings is a____base alloy.

Accepted Answer

Tin

Answer

Lead

Answer

Aluminium

Answer

Copper