Building Materials MCQs Set-9

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

compressive strength of cement

Tensile strength of cement

Soundness of cement

Setting time of cement

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

Queen closer

Stretchers

Headers

Brick bats

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

All of these

Di-calcium silicate

Tri-calcium silicate

Tri-calcium aluminate

4. The commonly used lime in white washing, is

Hydraulic lime

Quick lime

Fat lime

White lime

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

Double Flemish bond

English bond

Single Flemish bond

Zigzag bond

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

Anthophylite asbestos

All of these

Actinolite asbestos

Amosite asbestos

7. Stainless steel contains

36% of chromium and 12% of nickel

18% of chromium and 8% nickel

12% of chromium and 36% of nickel

8% of chromium and 18% of nickel

8. Plywood is made from

Bamboo fibre

Teak wood only

Asbestos sheets

Common timber

9. For melting one tonne of cast iron

All of these

700 m^3 air is required

One quintal coke is required

20 kg limestone is required

10. The hardest rock is

Marble

Diamond

Quartz

Talc

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11. Seasoning of timber is done for

None to these

Increasing strength of timber

Decreasing moisture content

Increasing moisture content

12. 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

13. Durability of building stone is affected by its

Chemical composition

Resistance to atmosphere

All the above

Texture

14. Lacquer paints

Consist of resin and nitro-cellulose

Are less durable as compared to enamel paints

All of these

Are generally applied on structural steel

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

None of these

(B) Are affected by moisture

(A) Split easily

(C) Both (A) and (B)

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

Absence of sunlight

Presence of sap

Dampness

All of these

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

Of high degree of tenacity

All of these

Of good plasticity

Sufficiently pure

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

Stainless steel

Cast steel

Mild steel

Bessemer steel

19. Percentage of carbon content in mild steel is

Between 0.25 and 0.7

Between 0.7 and 1.5

Less than 0.25

Greater than 1.5

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

Oil varnish

Water varnish

Turpentine varnish

Spirit varnish

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21. The slump recommended for mass concrete is about

125 mm to 150 mm

50 mm to 100 mm

100 mm to 125 mm

25 mm to 50 mm

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

5 to 10 %

20 to 30 %

50 to 60 %

70 to 80 %

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

All of these

Polypropylene

Polystyrene

Polyvinylchloride

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

Carbon

Iron

Manganese

Sulphur

25. 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

26. Excess of silica in brick earth results in

Enhancing the impermeability of bricks

Cracking and warping of bricks

None of these

Loss of cohesion

27. Glazing is used to make earthenware

Soft

Hard

Impervious

Porous

28. A heavy stone is suitable for

Arches

Roads

Rubble masonry

Retaining walls

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

Slate

Limestone

Quartzite

Marble

30. 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

Quarrying of stones

Seasoning of stones

Blasting of stones

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

Bessemer pig

Grey or foundry pig

White or forge pig

Mottled pig

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

Tri-calcium silicate

Tetra-calcium alumino-ferrite

Di-calcium silicate

Tri-calcium aluminate

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

7.0 N/mm²

14.0 N/mm²

3.5 N/mm²

10.5 N/mm²

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

Iron ore, coal and sulphur

Iron ore, coal and lime stone

Iron ore, carbon and sulphur

Iron ore, carbon and lime stone

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

20 %

25 %

10 %

15 %

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

Tri-calcium aluminate

Di-calcium silicate

Tri-calcium silicate

Gypsum

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

Vanadium

Chromium

Nickel

Manganese

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

Its final setting time is about 10 hours

It possesses less compressive strength

Its initial setting time is about one hour

All of these

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

Phosphorus

Sulphur

Silicon

Carbon

40. Quick lime (or caustic lime)

All of these

Is obtained by the calcination of pure lime stone

Has great affinity to moisture

Is amorphous

Building Materials MCQs Set-9

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