Building Materials MCQs Set-9

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1. Percentage of carbon content in mild steel is

Greater than 1.5

Less than 0.25

Between 0.7 and 1.5

Between 0.25 and 0.7

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

Iron

Manganese

Sulphur

Carbon

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

Vanadium

Chromium

Nickel

Manganese

4. Lacquer paints

Consist of resin and nitro-cellulose

Are generally applied on structural steel

All of these

Are less durable as compared to enamel paints

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

Of high degree of tenacity

All of these

Sufficiently pure

Of good plasticity

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

Queen closer

Stretchers

Headers

Brick bats

7. Seasoning of timber is done for

Increasing strength of timber

Decreasing moisture content

Increasing moisture content

None to these

8. Glazing is used to make earthenware

Soft

Porous

Impervious

Hard

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

All of these

Presence of sap

Absence of sunlight

Dampness

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

14.0 N/mm²

7.0 N/mm²

3.5 N/mm²

10.5 N/mm²

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11. For melting one tonne of cast iron

One quintal coke is required

700 m^3 air is required

All of these

20 kg limestone is required

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

10 %

15 %

25 %

20 %

13. Durability of building stone is affected by its

Texture

Chemical composition

Resistance to atmosphere

All the above

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

Amosite asbestos

Actinolite asbestos

All of these

Anthophylite asbestos

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

Oil varnish

Turpentine varnish

Spirit varnish

Water varnish

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

Sulphur

Silicon

Phosphorus

Carbon

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

Tri-calcium silicate

Di-calcium silicate

Gypsum

Tri-calcium aluminate

18. Quick lime (or caustic lime)

Is amorphous

All of these

Is obtained by the calcination of pure lime stone

Has great affinity to moisture

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

Di-calcium silicate

Tri-calcium silicate

Tri-calcium aluminate

All of these

20. Excess of silica in brick earth results in

Enhancing the impermeability of bricks

Loss of cohesion

Cracking and warping of bricks

None of these

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21. A heavy stone is suitable for

Roads

Arches

Rubble masonry

Retaining walls

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

Limestone

Quartzite

Marble

Slate

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

2.2 kg

None of these

3.2 kg

1.5 kg

24. 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

(A) Split easily

(B) Are affected by moisture

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

Di-calcium silicate

Tri-calcium aluminate

Tetra-calcium alumino-ferrite

Tri-calcium silicate

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

5 to 10 %

20 to 30 %

50 to 60 %

70 to 80 %

27. The hardest rock is

Diamond

Quartz

Talc

Marble

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

Cast steel

Mild steel

Stainless steel

Bessemer steel

29. The commonly used lime in white washing, is

Hydraulic lime

Quick lime

Fat lime

White lime

30. Granite is not suitable for ordinary building purpose because

It is costly

It has less crushing strength

It cannot be polished

It is not a fireproof material

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31. The slump recommended for mass concrete is about

100 mm to 125 mm

125 mm to 150 mm

50 mm to 100 mm

25 mm to 50 mm

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

Double Flemish bond

Single Flemish bond

Zigzag bond

English bond

33. 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

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

It possesses less compressive strength

Its final setting time is about 10 hours

Its initial setting time is about one hour

All of these

35. Plywood is made from

Common timber

Asbestos sheets

Teak wood only

Bamboo fibre

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

Iron ore, carbon and sulphur

Iron ore, carbon and lime stone

Iron ore, coal and sulphur

Iron ore, coal and lime stone

37. 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

Blasting of stones

Seasoning of stones

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

Polystyrene

All of these

Polyvinylchloride

Polypropylene

39. Stainless steel contains

18% of chromium and 8% nickel

12% of chromium and 36% of nickel

8% of chromium and 18% of nickel

36% of chromium and 12% of nickel

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

Tensile strength of cement

compressive strength of cement

Soundness of cement

Setting time of cement

Building Materials MCQs Set-9

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