Building Materials MCQs Set-9

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

Manganese

Carbon

Sulphur

Iron

2. 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

3. Quick lime (or caustic lime)

All of these

Is amorphous

Has great affinity to moisture

Is obtained by the calcination of pure lime stone

4. Lacquer paints

Are less durable as compared to enamel paints

All of these

Consist of resin and nitro-cellulose

Are generally applied on structural steel

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

50 to 60 %

5 to 10 %

70 to 80 %

20 to 30 %

6. For melting one tonne of cast iron

20 kg limestone is required

700 m^3 air is required

All of these

One quintal coke is required

7. Stainless steel contains

12% of chromium and 36% of nickel

36% of chromium and 12% of nickel

18% of chromium and 8% nickel

8% of chromium and 18% of nickel

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

English bond

Double Flemish bond

Zigzag bond

Single Flemish bond

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

Tri-calcium silicate

Di-calcium silicate

Tri-calcium aluminate

All of these

10. The slump recommended for mass concrete is about

100 mm to 125 mm

25 mm to 50 mm

125 mm to 150 mm

50 mm to 100 mm

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

Its initial setting time is about one hour

It possesses less compressive strength

All of these

Its final setting time is about 10 hours

12. In stone masonry, if stones are so placed that their layers are parallel to the direction of load, they

(C) Both (A) and (B)

(A) Split easily

None of these

(B) Are affected by moisture

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

14.0 N/mm²

3.5 N/mm²

10.5 N/mm²

7.0 N/mm²

14. Percentage of carbon content in mild steel is

Between 0.25 and 0.7

Less than 0.25

Between 0.7 and 1.5

Greater than 1.5

15. The commonly used lime in white washing, is

Fat lime

Hydraulic lime

White lime

Quick lime

16. Glazing is used to make earthenware

Porous

Soft

Hard

Impervious

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

Mild steel

Bessemer steel

Stainless steel

Cast steel

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

Headers

Stretchers

Queen closer

Brick bats

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

Slate

Marble

Quartzite

Limestone

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

10 %

20 %

25 %

15 %

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21. Seasoning of timber is done for

Decreasing moisture content

Increasing strength of timber

Increasing moisture content

None to these

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

Iron ore, coal and sulphur

Iron ore, carbon and lime stone

Iron ore, carbon and sulphur

Iron ore, coal and lime stone

23. The hardest rock is

Marble

Talc

Quartz

Diamond

24. Plywood is made from

Asbestos sheets

Teak wood only

Common timber

Bamboo fibre

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

Vanadium

Manganese

Nickel

Chromium

26. 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

Seasoning of stones

Quarrying of stones

Blasting of stones

27. Durability of building stone is affected by its

Chemical composition

Texture

All the above

Resistance to atmosphere

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

Mottled pig

Bessemer pig

Grey or foundry pig

White or forge pig

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

Tetra-calcium alumino-ferrite

Tri-calcium silicate

Tri-calcium aluminate

Di-calcium silicate

30. Excess of silica in brick earth results in

Loss of cohesion

Cracking and warping of bricks

Enhancing the impermeability of bricks

None of these

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31. A heavy stone is suitable for

Rubble masonry

Retaining walls

Roads

Arches

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

Polystyrene

All of these

Polypropylene

Polyvinylchloride

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

Sulphur

Silicon

Phosphorus

Carbon

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

Tensile strength of cement

compressive strength of cement

Soundness of cement

Setting time of cement

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

3.2 kg

1.5 kg

None of these

2.2 kg

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

Water varnish

Turpentine varnish

Oil varnish

Spirit varnish

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

Sufficiently pure

Of good plasticity

All of these

Of high degree of tenacity

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

Absence of sunlight

All of these

Dampness

Presence of sap

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

Amosite asbestos

Anthophylite asbestos

Actinolite asbestos

All of these

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

Gypsum

Tri-calcium aluminate

Tri-calcium silicate

Di-calcium silicate

Building Materials MCQs Set-9

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