Question # 1

What impurity in steel can cause ted shortness which means the steel becomes unworkable at high temperature.

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Sulphur

Silicon

Magnesium

Aluminium

Hydrolytic reaction of fat with caustic soda is known as ______

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Esterification

Saponification

Acetylation

Carboxylation

_________ is used as stablizer.

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CaO

SiO2

NaCl

None of these

In Pakistan the total production of glass is over ________ tons per year.

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800

8000

80,000

None of these

What element is added to copper to increase its strength and fatigue propertioes.

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Silicon

Aluminium

Beryllium

Copper

What element constitutes the major component of most bronzes.

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Tin

Zinc

Carbon

Aluminum

What is the scaling off of a surface in flakes or layers as the result of corrosion?

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Expoliation

Corrosion fatigue

Scaping

Fretting

Which of following is used as make up chemical in Kraft process.

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Na2CO3

KCl

Na2SO4

NaOH

Turpentine is obtained from._______________

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Oak tree

Pine tree

Birch tree

Lemon tree

What refers to the application of any process whereby the surface of steel is altered so that it will become hard.

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Caburizing

Case harden zing

Ammealing

Surface hardening

The principle former of almost all glasses is

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(SIO2)n

(SiO3)n

(SiO2)

None of these

The composition of mixture of clay and lime stone in the raw for cement material is.

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75% lime stone and 25% clay

25% lime stone and 75% clay

15% lime stone and 55% clay

30% limes stone and 79% clay

What ASTM test for shear strength is designated for plastics.

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D 732

D 790

D 695

D 638

The green color of water in a lake is due to

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Excessive growth of sea weeds

Algae

Pollution

Grass

What is the advantage of quench hardening?

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Imporoved strength

Hardness

Wear characteristics

All of the choice

Bromine number is measure of.

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Paraffins

Unsaturates

Saturates

None of these

Commercial detergents contain mainly ___________

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RCOON

RONa

RSNa

All above

When a drop of detergent solution is added onto a clean towel. It spreads instead of existing as a droplet Which of the following statements explains this phenomenon.

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Detergent acts as an emulsifying agent

Detergent reduce surface tension of water

Detergent reduces surface tension of water

All of above

The following alloys are the chief alloys that are die cast except.

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Zinc alloys

Magnesium alloys

Manganese alloys

Nickel alloys

In glass making the whole combination of ingredients is called a.

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Gangue

Batch

Mixture

None of these

Hot isostatic pressing is not a viable option if the chief criterion is

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Strength without gram growth

Lost cost

Zero porosity

Make it hard

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