Materials and Construction

Question: As the impurities are oxidised, the melting point of iron
[A].

decreases.

[B].

remains unchanged.

[C].

increases.

[D].

may increase or decrease ; unpredictable.

Answer: Option C

Explanation:

No answer description available for this question.

Question: Cast iron is having very high
[A].

proximity between its elastic limit and ultimate breaking strength.

[B].

ductility.

[C].

tensile strength.

[D].

all (a), (b) and (c).

Answer: Option A

Explanation:

No answer description available for this question.

Question: Wrought iron is having very high
[A].

hardness.

[B].

strength.

[C].

corrosion resistance.

[D].

susceptibility to changes in its properties by heat treatment.

Answer: Option C

Explanation:

No answer description available for this question.

Question: German silver used for decorative purposes contains maximum percentage of
[A].

silver

[B].

copper

[C].

zinc

[D].

nickel

Answer: Option B

Explanation:

No answer description available for this question.

Question: Locomotive boiler tubes are made of __________ alloys.
[A].

arsenic copper

[B].

magnesium

[C].

aluminium

[D].

nickel

Answer: Option A

Explanation:

No answer description available for this question.

Question: Copper has very low
[A].

malleability

[B].

ductility

[C].

tensile strength

[D].

thermal & electrical conductivity

Answer: Option C

Explanation:

No answer description available for this question.

Question: ‘Age hardening’ of duralumin is due to
[A].

copper

[B].

magnesium

[C].

both (a) & (b)

[D].

neither (a) nor (b)

Answer: Option C

Explanation:

No answer description available for this question.

Question: Aluminium alloy is one of the most suitable materials of construction for aircrafts mainly due to its
[A].

high strength to weight ratio.

[B].

low temperature strength properties.

[C].

its ability to be cast, rolled, forged & stamped.

[D].

high strength and corrosion & oxidation-resistance at elevated temperature.

Answer: Option A

Explanation:

No answer description available for this question.

Question: Aluminium as a material of construction suffers from the disadvantage of
[A].

very high cost.

[B].

rather low tensile strength.

[C].

very low strength to weight ratio.

[D].

scarce availability.

Answer: Option B

Explanation:

No answer description available for this question.

Question: Monel alloy is
[A].

the costliest of all the alloys of nickel.

[B].

not suitable for making kitchen utensils.

[C].

used for making steam valves and turbine blades as it resists steam attack at high temperature.

[D].

not used in cast and wrought forms.

Answer: Option C

Explanation:

No answer description available for this question.