Building Materials MCQs Set-9

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

70 to 80 %

5 to 10 %

20 to 30 %

50 to 60 %

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

Amosite asbestos

All of these

Actinolite asbestos

Anthophylite asbestos

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

Phosphorus

Sulphur

Silicon

Carbon

4. Percentage of carbon content in mild steel is

Less than 0.25

Between 0.25 and 0.7

Between 0.7 and 1.5

Greater than 1.5

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

Tensile strength of cement

compressive strength of cement

Soundness of cement

Setting time of cement

6. The hardest rock is

Diamond

Quartz

Talc

Marble

7. Excess of silica in brick earth results in

Loss of cohesion

Cracking and warping of bricks

None of these

Enhancing the impermeability of bricks

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

1.5 kg

None of these

2.2 kg

3.2 kg

9. 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

10. Seasoning of timber is done for

Increasing strength of timber

Increasing moisture content

None to these

Decreasing moisture content

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

Polypropylene

All of these

Polyvinylchloride

Polystyrene

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

Tri-calcium aluminate

Di-calcium silicate

Tri-calcium silicate

Tetra-calcium alumino-ferrite

13. Granite is not suitable for ordinary building purpose because

It cannot be polished

It is not a fireproof material

It is costly

It has less crushing strength

14. Lacquer paints

All of these

Are generally applied on structural steel

Consist of resin and nitro-cellulose

Are less durable as compared to enamel paints

15. 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

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

10 %

25 %

20 %

15 %

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

English bond

Double Flemish bond

Single Flemish bond

Zigzag bond

18. Glazing is used to make earthenware

Soft

Impervious

Porous

Hard

19. Quick lime (or caustic lime)

Has great affinity to moisture

Is obtained by the calcination of pure lime stone

Is amorphous

All of these

20. 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

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

Tri-calcium silicate

Gypsum

Tri-calcium aluminate

Di-calcium silicate

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

Bessemer pig

Grey or foundry pig

Mottled pig

White or forge pig

23. For melting one tonne of cast iron

All of these

One quintal coke is required

700 m^3 air is required

20 kg limestone is required

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

Headers

Queen closer

Stretchers

Brick bats

25. Stainless steel contains

36% of chromium and 12% of nickel

8% of chromium and 18% of nickel

12% of chromium and 36% of nickel

18% of chromium and 8% nickel

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

Turpentine varnish

Oil varnish

Water varnish

Spirit varnish

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

Slate

Marble

Limestone

Quartzite

28. Durability of building stone is affected by its

Texture

Resistance to atmosphere

All the above

Chemical composition

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

Mild steel

Cast steel

Bessemer steel

Stainless steel

30. The commonly used lime in white washing, is

Fat lime

Quick lime

White lime

Hydraulic lime

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

Manganese

Nickel

Chromium

Vanadium

32. 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

33. Plywood is made from

Common timber

Bamboo fibre

Teak wood only

Asbestos sheets

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

Tri-calcium silicate

Di-calcium silicate

All of these

Tri-calcium aluminate

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

Manganese

Carbon

Iron

Sulphur

36. The slump recommended for mass concrete is about

25 mm to 50 mm

50 mm to 100 mm

100 mm to 125 mm

125 mm to 150 mm

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

3.5 N/mm²

7.0 N/mm²

10.5 N/mm²

14.0 N/mm²

38. A heavy stone is suitable for

Retaining walls

Roads

Rubble masonry

Arches

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

Seasoning of stones

Blasting of stones

Dressing of stones

Quarrying of stones

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

All of these

Sufficiently pure

Of good plasticity

Of high degree of tenacity

Building Materials MCQs Set-9

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