Building Materials MCQs Set-9

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

Carbon

Sulphur

Phosphorus

Silicon

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

3.2 kg

None of these

1.5 kg

2.2 kg

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

Tri-calcium aluminate

Tri-calcium silicate

Tetra-calcium alumino-ferrite

Di-calcium silicate

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

Polypropylene

Polyvinylchloride

All of these

Polystyrene

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

Dressing of stones

Seasoning of stones

Blasting of stones

Quarrying of stones

6. Granite is not suitable for ordinary building purpose because

It is not a fireproof material

It is costly

It cannot be polished

It has less crushing strength

7. Plywood is made from

Bamboo fibre

Common timber

Asbestos sheets

Teak wood only

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

Soundness of cement

compressive strength of cement

Tensile strength of cement

Setting time of cement

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

Turpentine varnish

Spirit varnish

Oil varnish

Water varnish

10. 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

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

10.5 N/mm²

3.5 N/mm²

14.0 N/mm²

7.0 N/mm²

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

25 %

15 %

10 %

20 %

13. Lacquer paints

Are less durable as compared to enamel paints

Are generally applied on structural steel

All of these

Consist of resin and nitro-cellulose

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

(C) Both (A) and (B)

None of these

(B) Are affected by moisture

(A) Split easily

15. The slump recommended for mass concrete is about

50 mm to 100 mm

100 mm to 125 mm

25 mm to 50 mm

125 mm to 150 mm

16. Glazing is used to make earthenware

Impervious

Porous

Soft

Hard

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

20 to 30 %

5 to 10 %

50 to 60 %

70 to 80 %

18. 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

19. Quick lime (or caustic lime)

Is amorphous

All of these

Is obtained by the calcination of pure lime stone

Has great affinity to moisture

20. The hardest rock is

Quartz

Diamond

Talc

Marble

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21. Durability of building stone is affected by its

All the above

Resistance to atmosphere

Texture

Chemical composition

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

English bond

Double Flemish bond

Zigzag bond

Single Flemish bond

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

Its final setting time is about 10 hours

All of these

It possesses less compressive strength

Its initial setting time is about one hour

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

Iron ore, carbon and sulphur

Iron ore, coal and sulphur

Iron ore, coal and lime stone

Iron ore, carbon and lime stone

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

Brick bats

Queen closer

Headers

Stretchers

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

Tri-calcium silicate

Di-calcium silicate

Gypsum

Tri-calcium aluminate

27. 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

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

Manganese

Chromium

Vanadium

Nickel

29. The commonly used lime in white washing, is

White lime

Hydraulic lime

Quick lime

Fat lime

30. Stainless steel contains

36% of chromium and 12% of nickel

12% of chromium and 36% of nickel

8% of chromium and 18% of nickel

18% of chromium and 8% nickel

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

Slate

Quartzite

Limestone

Marble

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

Amosite asbestos

Actinolite asbestos

Anthophylite asbestos

All of these

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

Tri-calcium aluminate

Di-calcium silicate

All of these

Tri-calcium silicate

34. Excess of silica in brick earth results in

Cracking and warping of bricks

None of these

Enhancing the impermeability of bricks

Loss of cohesion

35. 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

36. A heavy stone is suitable for

Arches

Roads

Retaining walls

Rubble masonry

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

Cast steel

Stainless steel

Mild steel

Bessemer steel

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

Absence of sunlight

Dampness

Presence of sap

All of these

39. Seasoning of timber is done for

Increasing moisture content

Decreasing moisture content

Increasing strength of timber

None to these

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

Sulphur

Carbon

Manganese

Iron

Building Materials MCQs Set-9

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