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

Blasting of stones

Seasoning of stones

Quarrying of stones

2. Percentage of carbon content in mild steel is

Less than 0.25

Between 0.25 and 0.7

Greater than 1.5

Between 0.7 and 1.5

3. Plywood is made from

Common timber

Teak wood only

Bamboo fibre

Asbestos sheets

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

7.0 N/mm²

14.0 N/mm²

10.5 N/mm²

3.5 N/mm²

5. Lacquer paints

All of these

Consist of resin and nitro-cellulose

Are generally applied on structural steel

Are less durable as compared to enamel paints

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

Quartzite

Slate

Marble

Limestone

7. Granite is not suitable for ordinary building purpose because

It cannot be polished

It has less crushing strength

It is not a fireproof material

It is costly

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

2.2 kg

1.5 kg

3.2 kg

None of these

9. The commonly used lime in white washing, is

Fat lime

Quick lime

Hydraulic lime

White lime

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

Of high degree of tenacity

Of good plasticity

Sufficiently pure

All of these

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

Polystyrene

Polypropylene

All of these

Polyvinylchloride

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

Chromium

Nickel

Vanadium

Manganese

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

Sulphur

Phosphorus

Silicon

Carbon

14. 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

15. Seasoning of timber is done for

Increasing strength of timber

None to these

Decreasing moisture content

Increasing moisture content

16. The slump recommended for mass concrete is about

50 mm to 100 mm

100 mm to 125 mm

25 mm to 50 mm

125 mm to 150 mm

17. Durability of building stone is affected by its

Chemical composition

Texture

Resistance to atmosphere

All the above

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

Soundness of cement

Setting time of cement

Tensile strength of cement

compressive strength of cement

19. 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

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

Presence of sap

Absence of sunlight

All of these

Dampness

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21. A heavy stone is suitable for

Retaining walls

Arches

Roads

Rubble masonry

22. Quick lime (or caustic lime)

Is obtained by the calcination of pure lime stone

Is amorphous

All of these

Has great affinity to moisture

23. The hardest rock is

Quartz

Diamond

Marble

Talc

24. Excess of silica in brick earth results in

None of these

Cracking and warping of bricks

Loss of cohesion

Enhancing the impermeability of bricks

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

Actinolite asbestos

Anthophylite asbestos

Amosite asbestos

All of these

26. 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

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

Oil varnish

Spirit varnish

Turpentine varnish

Water varnish

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

Tri-calcium silicate

Di-calcium silicate

Gypsum

Tri-calcium aluminate

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

Tri-calcium aluminate

Di-calcium silicate

Tetra-calcium alumino-ferrite

Tri-calcium silicate

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

Double Flemish bond

English bond

Zigzag bond

Single Flemish bond

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

Di-calcium silicate

Tri-calcium aluminate

Tri-calcium silicate

All of these

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

50 to 60 %

20 to 30 %

70 to 80 %

5 to 10 %

33. Stainless steel contains

36% of chromium and 12% of nickel

12% of chromium and 36% of nickel

18% of chromium and 8% nickel

8% of chromium and 18% of nickel

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

Carbon

Sulphur

Iron

Manganese

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

20 %

10 %

15 %

25 %

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

Iron ore, carbon and lime stone

Iron ore, carbon and sulphur

Iron ore, coal and sulphur

Iron ore, coal and lime stone

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

Headers

Queen closer

Brick bats

Stretchers

38. 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

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

Stainless steel

Cast steel

Bessemer steel

Mild steel

40. Glazing is used to make earthenware

Hard

Porous

Soft

Impervious

Building Materials MCQs Set-9

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