Building Materials MCQs Set-9

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1. 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

Quarrying of stones

Blasting of stones

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

Bessemer pig

White or forge pig

Mottled pig

Grey or foundry pig

3. The slump recommended for mass concrete is about

125 mm to 150 mm

100 mm to 125 mm

50 mm to 100 mm

25 mm to 50 mm

4. Granite is not suitable for ordinary building purpose because

It is costly

It has less crushing strength

It cannot be polished

It is not a fireproof material

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

Oil varnish

Water varnish

Spirit varnish

Turpentine varnish

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

Brick bats

Headers

Stretchers

Queen closer

7. 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

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

3.5 N/mm²

10.5 N/mm²

7.0 N/mm²

14.0 N/mm²

9. Durability of building stone is affected by its

All the above

Resistance to atmosphere

Chemical composition

Texture

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

70 to 80 %

20 to 30 %

50 to 60 %

5 to 10 %

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11. Excess of silica in brick earth results in

Loss of cohesion

None of these

Cracking and warping of bricks

Enhancing the impermeability of bricks

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

All of these

Sufficiently pure

Of high degree of tenacity

Of good plasticity

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

(A) Split easily

None of these

(B) Are affected by moisture

(C) Both (A) and (B)

14. A heavy stone is suitable for

Retaining walls

Rubble masonry

Arches

Roads

15. The hardest rock is

Talc

Quartz

Marble

Diamond

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

All of these

It possesses less compressive strength

Its initial setting time is about one hour

Its final setting time is about 10 hours

17. Percentage of carbon content in mild steel is

Greater than 1.5

Less than 0.25

Between 0.7 and 1.5

Between 0.25 and 0.7

18. Stainless steel contains

8% of chromium and 18% of nickel

12% of chromium and 36% of nickel

18% of chromium and 8% nickel

36% of chromium and 12% of nickel

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

Double Flemish bond

Zigzag bond

Single Flemish bond

English bond

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

2.2 kg

3.2 kg

None of these

1.5 kg

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21. Quick lime (or caustic lime)

Is obtained by the calcination of pure lime stone

Is amorphous

All of these

Has great affinity to moisture

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

10 %

15 %

25 %

20 %

23. Seasoning of timber is done for

Increasing strength of timber

Decreasing moisture content

None to these

Increasing moisture content

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

compressive strength of cement

Soundness of cement

Setting time of cement

Tensile strength of cement

25. Lacquer paints

Are generally applied on structural steel

Consist of resin and nitro-cellulose

Are less durable as compared to enamel paints

All of these

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

Polystyrene

All of these

Polyvinylchloride

Polypropylene

27. Plywood is made from

Common timber

Bamboo fibre

Asbestos sheets

Teak wood only

28. The commonly used lime in white washing, is

Hydraulic lime

Quick lime

Fat lime

White lime

29. Glazing is used to make earthenware

Porous

Soft

Hard

Impervious

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

All of these

Anthophylite asbestos

Actinolite asbestos

Amosite asbestos

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

Limestone

Quartzite

Slate

Marble

32. For melting one tonne of cast iron

All of these

700 m^3 air is required

20 kg limestone is required

One quintal coke is required

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

Tri-calcium silicate

Tetra-calcium alumino-ferrite

Di-calcium silicate

Tri-calcium aluminate

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

Phosphorus

Sulphur

Silicon

Carbon

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

Chromium

Vanadium

Manganese

Nickel

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

All of these

Presence of sap

Dampness

Absence of sunlight

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

Di-calcium silicate

Gypsum

Tri-calcium silicate

Tri-calcium aluminate

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

Bessemer steel

Mild steel

Stainless steel

Cast steel

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

Tri-calcium aluminate

Tri-calcium silicate

All of these

Di-calcium silicate

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

Sulphur

Carbon

Iron

Manganese

Building Materials MCQs Set-9

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