Building Materials MCQs Set-9

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

Of good plasticity

Of high degree of tenacity

Sufficiently pure

All of these

2. Percentage of carbon content in mild steel is

Less than 0.25

Between 0.7 and 1.5

Between 0.25 and 0.7

Greater than 1.5

3. Excess of silica in brick earth results in

Enhancing the impermeability of bricks

None of these

Cracking and warping of bricks

Loss of cohesion

4. Granite is not suitable for ordinary building purpose because

It has less crushing strength

It cannot be polished

It is costly

It is not a fireproof material

5. Durability of building stone is affected by its

Texture

Chemical composition

All the above

Resistance to atmosphere

6. The slump recommended for mass concrete is about

50 mm to 100 mm

25 mm to 50 mm

100 mm to 125 mm

125 mm to 150 mm

7. 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)

(A) Split easily

None of these

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

15 %

25 %

10 %

20 %

9. The hardest rock is

Quartz

Marble

Diamond

Talc

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

Stretchers

Queen closer

Brick bats

Headers

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

Polyvinylchloride

Polystyrene

All of these

Polypropylene

12. The commonly used lime in white washing, is

White lime

Hydraulic lime

Quick lime

Fat lime

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

compressive strength of cement

Tensile strength of cement

Soundness of cement

Setting time of cement

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

Quarrying of stones

Dressing of stones

Seasoning of stones

Blasting of stones

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

Carbon

Silicon

Sulphur

Phosphorus

16. 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

All of these

Its initial setting time is about one hour

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

1.5 kg

2.2 kg

3.2 kg

None of these

18. Seasoning of timber is done for

None to these

Decreasing moisture content

Increasing moisture content

Increasing strength of timber

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

Iron

Carbon

Manganese

Sulphur

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

Dampness

Presence of sap

Absence of sunlight

All of these

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21. 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 lime stone

Iron ore, carbon and sulphur

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

20 to 30 %

50 to 60 %

5 to 10 %

70 to 80 %

23. Glazing is used to make earthenware

Hard

Porous

Soft

Impervious

24. Stainless steel contains

18% of chromium and 8% nickel

8% of chromium and 18% of nickel

36% of chromium and 12% of nickel

12% of chromium and 36% of nickel

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

Tri-calcium silicate

All of these

Tri-calcium aluminate

Di-calcium silicate

26. Plywood is made from

Common timber

Bamboo fibre

Asbestos sheets

Teak wood only

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

Single Flemish bond

Zigzag bond

Double Flemish bond

English bond

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

Vanadium

Manganese

Chromium

Nickel

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

Tri-calcium aluminate

Tri-calcium silicate

Tetra-calcium alumino-ferrite

Di-calcium silicate

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

Mild steel

Cast steel

Stainless steel

Bessemer steel

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31. For melting one tonne of cast iron

One quintal coke is required

All of these

20 kg limestone is required

700 m^3 air is required

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

Turpentine varnish

Spirit varnish

Oil varnish

Water varnish

33. A heavy stone is suitable for

Rubble masonry

Retaining walls

Arches

Roads

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

Gypsum

Tri-calcium silicate

Di-calcium silicate

Tri-calcium aluminate

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

Amosite asbestos

Actinolite asbestos

All of these

Anthophylite asbestos

36. Quick lime (or caustic lime)

Is amorphous

Has great affinity to moisture

All of these

Is obtained by the calcination of pure lime stone

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

Quartzite

Slate

Limestone

Marble

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

Bessemer pig

White or forge pig

Grey or foundry pig

Mottled pig

39. Lacquer paints

All of these

Are less durable as compared to enamel paints

Consist of resin and nitro-cellulose

Are generally applied on structural steel

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

10.5 N/mm²

7.0 N/mm²

14.0 N/mm²

3.5 N/mm²

Building Materials MCQs Set-9

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