Building Materials MCQs Set-9

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1. Granite is not suitable for ordinary building purpose because

It cannot be polished

It has less crushing strength

It is not a fireproof material

It is costly

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

3.2 kg

1.5 kg

None of these

2.2 kg

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

Polystyrene

Polyvinylchloride

All of these

Polypropylene

4. Percentage of carbon content in mild steel is

Greater than 1.5

Between 0.7 and 1.5

Between 0.25 and 0.7

Less than 0.25

5. 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

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

Marble

Quartzite

Limestone

Slate

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

7.0 N/mm²

10.5 N/mm²

14.0 N/mm²

3.5 N/mm²

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

Sulphur

Silicon

Carbon

Phosphorus

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

(B) Are affected by moisture

(C) Both (A) and (B)

None of these

(A) Split easily

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

Stainless steel

Mild steel

Cast steel

Bessemer steel

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

5 to 10 %

70 to 80 %

50 to 60 %

20 to 30 %

12. The slump recommended for mass concrete is about

125 mm to 150 mm

50 mm to 100 mm

25 mm to 50 mm

100 mm to 125 mm

13. Durability of building stone is affected by its

Chemical composition

Resistance to atmosphere

All the above

Texture

14. Seasoning of timber is done for

None to these

Increasing moisture content

Increasing strength of timber

Decreasing moisture content

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

Zigzag bond

Double Flemish bond

Single Flemish bond

English bond

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

Chromium

Manganese

Nickel

Vanadium

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

All of these

Of high degree of tenacity

Of good plasticity

Sufficiently pure

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

Carbon

Manganese

Iron

Sulphur

19. Excess of silica in brick earth results in

Cracking and warping of bricks

None of these

Enhancing the impermeability of bricks

Loss of cohesion

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

10 %

20 %

25 %

15 %

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

Queen closer

Headers

Stretchers

Brick bats

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

Spirit varnish

Oil varnish

Water varnish

Turpentine varnish

23. Stainless steel contains

8% of chromium and 18% of nickel

12% of chromium and 36% of nickel

36% of chromium and 12% of nickel

18% of chromium and 8% nickel

24. Lacquer paints

All of these

Consist of resin and nitro-cellulose

Are generally applied on structural steel

Are less durable as compared to enamel paints

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

Tri-calcium aluminate

Tri-calcium silicate

Gypsum

Di-calcium silicate

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

Tri-calcium silicate

All of these

Di-calcium silicate

Tri-calcium aluminate

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

Its final setting time is about 10 hours

Its initial setting time is about one hour

All of these

It possesses less compressive strength

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

Soundness of cement

compressive strength of cement

Setting time of cement

Tensile strength of cement

29. 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

Quarrying of stones

Seasoning of stones

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

Bessemer pig

Mottled pig

White or forge pig

Grey or foundry pig

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31. Glazing is used to make earthenware

Hard

Impervious

Soft

Porous

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

Amosite asbestos

Actinolite asbestos

All of these

Anthophylite asbestos

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

Iron ore, coal and lime stone

Iron ore, coal and sulphur

Iron ore, carbon and sulphur

Iron ore, carbon and lime stone

34. Quick lime (or caustic lime)

All of these

Has great affinity to moisture

Is amorphous

Is obtained by the calcination of pure lime stone

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

Absence of sunlight

Presence of sap

All of these

Dampness

36. The commonly used lime in white washing, is

Hydraulic lime

White lime

Quick lime

Fat lime

37. The hardest rock is

Talc

Marble

Quartz

Diamond

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

Tri-calcium silicate

Di-calcium silicate

Tetra-calcium alumino-ferrite

Tri-calcium aluminate

39. Plywood is made from

Bamboo fibre

Common timber

Teak wood only

Asbestos sheets

40. A heavy stone is suitable for

Roads

Retaining walls

Rubble masonry

Arches

Building Materials MCQs Set-9

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