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4

Wrought iron contains carbon upto

A. 0.25 %

B. 1.0 %

C. 1.5 %

D. 2 %

Correct Answer :

A. 0.25 %


Related Questions

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4

The weight of a good quality brick when immersed in water for a period of 16 hours should not exceed the weight of dry brick

A. 20 %

B. 15 %

C. 10 %

D. None of these

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4

Lime putty

A. Is made from hydraulic lime

B. Is made by adding lime to water

C. Can be used only upto three days

D. All of above

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4

Plastic

A. Is an organic substance

B. Consists of natural or synthetic binders

C. Finished products are rigid and stable at normal temperature

D. All the above

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4

Ground glass

A. Is made by grinding its one side

B. Is made by melting powdered glass paints surface

C. Is used for getting light without transparency

D. All the above

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4

The base material for distemper, is

A. Chalk

B. Lime

C. Lime putty

D. Cement wash

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4

The constituent of cement which is responsible for all the undesirable properties of cement is

A. Di-calcium silicate

B. Tri-calcium silicate

C. Tri-calcium aluminate

D. Tetra calcium alumino ferrite

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4

Asbestos is

A. Corrugated sheet used for roofing

B. An incombustible fire proof material

C. An organic substance

D. All the above

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4

Which of the following bricks are used for lining of furnaces?

A. Over-burnt bricks

B. Under-burnt bricks

C. Refractory bricks

D. First class bricks

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4

Formula for quick lime, is

A. CaCO3

B. Ca(OH)2

C. CO3CO2

D. None to these

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4

Mastic asphalt is

A. Acid resisting material

B. Non-corrosive material

C. Corrosive material

D. Heating-resisting material

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4

Quartzite is a

A. Metamorphic rock

B. Argillaceous rock

C. Calcareous rock

D. Siliceous rock

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4

Knots in timber are

A. Defects caused by crushing fibres

B. Splits radiating from the centre

C. Speckled strains

D. Signs of branches cut off

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4

The rocks which are formed due to cooling of magma at a relatively shallow depth from the earth's surface are called

A. Plutonic rocks

B. Hypabyssal rocks

C. Volcanic rocks

D. Igneous rocks

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4

If the furnace is provided with insufficient fuel at low temperatures, the type of pig iron produced, is called

A. Bessemer pig

B. Grey or foundry pig

C. White or forge pig

D. Mottled pig

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4

For melting one tonne of cast iron

A. 700 m3 air is required

B. 20 kg limestone is required

C. One quintal coke is required

D. All the above

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4

Blister steel

A. Is obtained by cementation process

B. Is full of fissures and cavities

C. Can be easily welded

D. All the above

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4

Plastic asphalt is

A. Used as a water proofing layer over roof

B. A mixture of cement and asphalt

C. A natural asphalt

D. A refinery product

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4

Index number expressing the relative sizes of both coarse and fine aggregates, is called

A. Proportioning of aggregates

B. Fineness modulus

C. Grading of aggregates

D. None of these

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4

A 1st class brick immersed in water for 24 hours, should not absorb water (by weight) more than

A. 10 %

B. 15 %

C. 20 %

D. 25 %

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4

The low voltage porcelain is mainly used for

A. Switch block

B. Insulating tubes

C. Lamp sockets

D. All of these

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4

Pick up the synthetic resin from the following:

A. Urea resin

B. Phenolic resin

C. Resorcinol resin

D. All of these

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4

Acrylic is the name of

A. Cellulose resin

B. Alkyd resin

C. Methyl methacrylate

D. Cumarone-indene

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4

For one cubic metre of brick masonry, number of bricks required, is

A. 400

B. 425

C. 450

D. 500

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4

The plastics prepared from Vinyl resin are

A. Odourless

B. Non-toxic

C. Transparent

D. All of these

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4

The practical limit of moisture content achieved in air drying of timber is

A. 5 %

B. 15 %

C. 25 %

D. 35 %

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4

Pick up the correct statement from the following:

A. Roasting is not necessary if iron ore is an oxide

B. Impurities float on the molten iron as slag

C. The slag contains lime about 45%

D. All the above

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4

Geologically, marble is known as

A. Sedimentary rock

B. Igneous rock

C. Metamorphic rock

D. Stratified rock

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4

Forge pig may be converted to wrought iron by

A. Rolling

B. Pudding

C. Shingling

D. Refining

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4

Pick up the most favourable condition for the rapid growth of fungus for dry rot from the following:

A. Absence of sun light

B. Dampness

C. Presence of sap

D. All the above

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4

The filler used in plastic bitumen, is

A. Shale powder

B. Talc powder

C. Asbestos powder

D. Plastic powder