Building Materials MCQs Set-9

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

Cast steel

Bessemer steel

Mild steel

Stainless steel

2. Granite is not suitable for ordinary building purpose because

It has less crushing strength

It cannot be polished

It is not a fireproof material

It is costly

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

Di-calcium silicate

Tri-calcium aluminate

Tri-calcium silicate

Gypsum

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

Dampness

Absence of sunlight

All of these

Presence of sap

5. Stainless steel contains

18% of chromium and 8% nickel

12% of chromium and 36% of nickel

36% of chromium and 12% of nickel

8% of chromium and 18% of nickel

6. Lacquer paints

Are generally applied on structural steel

All of these

Consist of resin and nitro-cellulose

Are less durable as compared to enamel paints

7. Excess of silica in brick earth results in

None of these

Enhancing the impermeability of bricks

Cracking and warping of bricks

Loss of cohesion

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

Sulphur

Iron

Manganese

Carbon

9. The commonly used lime in white washing, is

White lime

Fat lime

Quick lime

Hydraulic lime

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

White or forge pig

Bessemer pig

Grey or foundry pig

Mottled pig

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11. The hardest rock is

Marble

Talc

Quartz

Diamond

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

15 %

20 %

10 %

25 %

13. Plywood is made from

Bamboo fibre

Asbestos sheets

Common timber

Teak wood only

14. For melting one tonne of cast iron

20 kg limestone is required

700 m^3 air is required

All of these

One quintal coke is required

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

Di-calcium silicate

All of these

Tri-calcium silicate

Tri-calcium aluminate

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

Chromium

Nickel

Manganese

Vanadium

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

None of these

2.2 kg

3.2 kg

1.5 kg

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

Blasting of stones

Dressing of stones

Seasoning of stones

Quarrying of stones

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

Actinolite asbestos

Anthophylite asbestos

Amosite asbestos

All of these

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

Polystyrene

Polypropylene

All of these

Polyvinylchloride

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

All of these

Of good plasticity

Of high degree of tenacity

Sufficiently pure

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

Slate

Marble

Quartzite

Limestone

23. A heavy stone is suitable for

Rubble masonry

Arches

Retaining walls

Roads

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

Single Flemish bond

Zigzag bond

Double Flemish bond

English bond

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

Turpentine varnish

Oil varnish

Water varnish

Spirit varnish

26. Quick lime (or caustic lime)

Is amorphous

Has great affinity to moisture

Is obtained by the calcination of pure lime stone

All of these

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

Tetra-calcium alumino-ferrite

Di-calcium silicate

Tri-calcium silicate

Tri-calcium aluminate

28. Glazing is used to make earthenware

Porous

Soft

Impervious

Hard

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

Brick bats

Headers

Stretchers

Queen closer

30. Durability of building stone is affected by its

Resistance to atmosphere

Chemical composition

All the above

Texture

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

Phosphorus

Carbon

Silicon

Sulphur

32. Percentage of carbon content in mild steel is

Greater than 1.5

Between 0.7 and 1.5

Less than 0.25

Between 0.25 and 0.7

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

Iron ore, coal and sulphur

Iron ore, carbon and sulphur

Iron ore, carbon and lime stone

Iron ore, coal and lime stone

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

10.5 N/mm²

7.0 N/mm²

14.0 N/mm²

3.5 N/mm²

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

(A) Split easily

(C) Both (A) and (B)

None of these

(B) Are affected by moisture

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

70 to 80 %

50 to 60 %

5 to 10 %

20 to 30 %

37. The slump recommended for mass concrete is about

50 mm to 100 mm

25 mm to 50 mm

125 mm to 150 mm

100 mm to 125 mm

38. Seasoning of timber is done for

Increasing strength of timber

Decreasing moisture content

Increasing moisture content

None to these

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

Tensile strength of cement

Soundness of cement

compressive strength of cement

Setting time of cement

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

Its final setting time is about 10 hours

All of these

Its initial setting time is about one hour

It possesses less compressive strength

Building Materials MCQs Set-9

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