Building Materials MCQs Set-9

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1. Three basic raw materials which are needed in large quantities for production of steel are

Iron ore, carbon and sulphur

Iron ore, carbon and lime stone

Iron ore, coal and sulphur

Iron ore, coal and lime stone

2. For melting one tonne of cast iron

700 m^3 air is required

One quintal coke is required

20 kg limestone is required

All of these

3. To retard the initial setting time of cement, the compound responsible, is

Gypsum

Di-calcium silicate

Tri-calcium aluminate

Tri-calcium silicate

4. Pick up the most favorable condition for the rapid growth of fungus for dry rot from the following:

All of these

Dampness

Presence of sap

Absence of sunlight

5. Pig iron made from haematite ores free from sulphur, phosphorus and copper, is known as

Mottled pig

Grey or foundry pig

Bessemer pig

White or forge pig

6. In the cement the compound quickest to react with water, is

Tri-calcium silicate

Tetra-calcium alumino-ferrite

Tri-calcium aluminate

Di-calcium silicate

7. Crushing strength of a first class brick should not be less than

14.0 N/mm²

7.0 N/mm²

10.5 N/mm²

3.5 N/mm²

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

20 %

15 %

25 %

10 %

9. Which one of the following is acid resistant asbestos?

Anthophylite asbestos

Amosite asbestos

Actinolite asbestos

All of these

10. Lacquer paints

Consist of resin and nitro-cellulose

Are generally applied on structural steel

All of these

Are less durable as compared to enamel paints

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11. For preparing porcelains, the clay should beFor preparing porcelains, the clay should be

Of good plasticity

All of these

Sufficiently pure

Of high degree of tenacity

12. In stone masonry, if stones are so placed that their layers are parallel to the direction of load, they

(B) Are affected by moisture

None of these

(C) Both (A) and (B)

(A) Split easily

13. The commonly used lime in white washing, is

Hydraulic lime

Fat lime

White lime

Quick lime

14. To give a brilliant finish, the type of varnish used, is

Turpentine varnish

Water varnish

Spirit varnish

Oil varnish

15. Which of the following gradients exerts maximum influence on properties of steel?

Sulphur

Iron

Carbon

Manganese

16. The slump recommended for mass concrete is about

50 mm to 100 mm

25 mm to 50 mm

100 mm to 125 mm

125 mm to 150 mm

17. The main constituent of cement which is responsible for initial setting of cement is

All of these

Tri-calcium aluminate

Di-calcium silicate

Tri-calcium silicate

18. Stainless steel contains

12% of chromium and 36% of nickel

18% of chromium and 8% nickel

36% of chromium and 12% of nickel

8% of chromium and 18% of nickel

19. The preparation of surface of stone to obtain plain edges or to obtain stones of required size and shape is known as

Quarrying of stones

Dressing of stones

Seasoning of stones

Blasting of stones

20. In brick masonry the bond produced by laying alternate headers and stretchers in each course is known as

Single Flemish bond

Zigzag bond

English bond

Double Flemish bond

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21. The method of addition polymerization is used for obtaining:

Polyvinylchloride

Polypropylene

Polystyrene

All of these

22. Quick lime (or caustic lime)

Is amorphous

All of these

Is obtained by the calcination of pure lime stone

Has great affinity to moisture

23. A heavy stone is suitable for

Retaining walls

Arches

Rubble masonry

Roads

24. The percentage of alumina in a good brick earth lies between

50 to 60 %

70 to 80 %

5 to 10 %

20 to 30 %

25. Red short iron cracks when bent due to the presence of

Carbon

Silicon

Sulphur

Phosphorus

26. The steel used for the manufacture of rails, is

Cast steel

Stainless steel

Bessemer steel

Mild steel

27. The hardest rock is

Marble

Talc

Quartz

Diamond

28. Which of the following should be used for hearting of thicker walls?

Stretchers

Queen closer

Brick bats

Headers

29. Pick up the correct statement regarding low heat cement from the following:

It possesses less compressive strength

Its final setting time is about 10 hours

All of these

Its initial setting time is about one hour

30. Glazing is used to make earthenware

Hard

Impervious

Porous

Soft

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31. Seasoning of timber is done for

Increasing strength of timber

Decreasing moisture content

None to these

Increasing moisture content

32. Granite is not suitable for ordinary building purpose because

It is costly

It is not a fireproof material

It cannot be polished

It has less crushing strength

33. Plywood is made from

Common timber

Teak wood only

Bamboo fibre

Asbestos sheets

34. Durability of building stone is affected by its

Chemical composition

Resistance to atmosphere

Texture

All the above

35. Percentage of carbon content in mild steel is

Greater than 1.5

Between 0.25 and 0.7

Less than 0.25

Between 0.7 and 1.5

36. Excess of silica in brick earth results in

None of these

Cracking and warping of bricks

Enhancing the impermeability of bricks

Loss of cohesion

37. The yield strength and tensile strength of low carbon steel may be improved by the addition of

Manganese

Vanadium

Chromium

Nickel

38. Which of the following metamorphic rocks has the most weather resisting characteristics?

Slate

Limestone

Quartzite

Marble

39. For slaking of 10 kg of CaO, the theoretical amount of water is

2.2 kg

3.2 kg

1.5 kg

None of these

40. Le-Chatelier's device is used for determining the

Tensile strength of cement

Setting time of cement

compressive strength of cement

Soundness of cement

Building Materials MCQs Set-9

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