Building Materials MCQs Set-9

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

Presence of sap

Dampness

All of these

Absence of sunlight

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

Iron ore, carbon and sulphur

Iron ore, coal and lime stone

Iron ore, coal and sulphur

Iron ore, carbon and lime stone

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

Its final setting time is about 10 hours

Its initial setting time is about one hour

It possesses less compressive strength

All of these

4. Stainless steel contains

8% of chromium and 18% of nickel

12% of chromium and 36% of nickel

36% of chromium and 12% of nickel

18% of chromium and 8% nickel

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

Polyvinylchloride

Polystyrene

All of these

Polypropylene

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

70 to 80 %

50 to 60 %

5 to 10 %

20 to 30 %

7. Plywood is made from

Common timber

Bamboo fibre

Teak wood only

Asbestos sheets

8. Granite is not suitable for ordinary building purpose because

It cannot be polished

It has less crushing strength

It is costly

It is not a fireproof material

9. The slump recommended for mass concrete is about

125 mm to 150 mm

25 mm to 50 mm

100 mm to 125 mm

50 mm to 100 mm

10. 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

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11. The hardest rock is

Talc

Quartz

Diamond

Marble

12. Lacquer paints

Consist of resin and nitro-cellulose

All of these

Are generally applied on structural steel

Are less durable as compared to enamel paints

13. For melting one tonne of cast iron

One quintal coke is required

All of these

700 m^3 air is required

20 kg limestone is required

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

None of these

3.2 kg

1.5 kg

2.2 kg

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

14.0 N/mm²

7.0 N/mm²

10.5 N/mm²

3.5 N/mm²

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

Cast steel

Stainless steel

Mild steel

Bessemer steel

17. The commonly used lime in white washing, is

Fat lime

White lime

Hydraulic lime

Quick lime

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

Phosphorus

Carbon

Silicon

Sulphur

19. 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

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

Headers

Brick bats

Queen closer

Stretchers

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

Soundness of cement

Setting time of cement

Tensile strength of cement

compressive strength of cement

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

Zigzag bond

English bond

Single Flemish bond

Double Flemish bond

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

Manganese

Sulphur

Iron

Carbon

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

Tetra-calcium alumino-ferrite

Di-calcium silicate

Tri-calcium aluminate

Tri-calcium silicate

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

Amosite asbestos

Anthophylite asbestos

Actinolite asbestos

All of these

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

Sufficiently pure

Of high degree of tenacity

All of these

Of good plasticity

27. Quick lime (or caustic lime)

All of these

Has great affinity to moisture

Is amorphous

Is obtained by the calcination of pure lime stone

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

Mottled pig

Grey or foundry pig

White or forge pig

Bessemer pig

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

10 %

20 %

15 %

25 %

30. Seasoning of timber is done for

Decreasing moisture content

Increasing strength of timber

None to these

Increasing moisture content

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31. Excess of silica in brick earth results in

None of these

Enhancing the impermeability of bricks

Cracking and warping of bricks

Loss of cohesion

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

Nickel

Vanadium

Chromium

Manganese

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

Slate

Limestone

Marble

Quartzite

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

Tri-calcium aluminate

Di-calcium silicate

Tri-calcium silicate

Gypsum

35. Durability of building stone is affected by its

Chemical composition

Texture

Resistance to atmosphere

All the above

36. Glazing is used to make earthenware

Hard

Impervious

Soft

Porous

37. Percentage of carbon content in mild steel is

Between 0.25 and 0.7

Greater than 1.5

Less than 0.25

Between 0.7 and 1.5

38. 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

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

Water varnish

Spirit varnish

Oil varnish

Turpentine varnish

40. A heavy stone is suitable for

Roads

Retaining walls

Rubble masonry

Arches

Building Materials MCQs Set-9

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