Building Materials MCQs Set-9

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

All of these

Its initial setting time is about one hour

It possesses less compressive strength

Its final setting time is about 10 hours

2. Glazing is used to make earthenware

Impervious

Hard

Porous

Soft

3. 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

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

Tetra-calcium alumino-ferrite

Tri-calcium silicate

Tri-calcium aluminate

Di-calcium silicate

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

Tri-calcium silicate

Tri-calcium aluminate

All of these

Di-calcium silicate

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

Gypsum

Tri-calcium aluminate

Tri-calcium silicate

Di-calcium silicate

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

Slate

Quartzite

Limestone

Marble

8. Seasoning of timber is done for

Increasing strength of timber

Increasing moisture content

None to these

Decreasing moisture content

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

Iron ore, coal and sulphur

Iron ore, carbon and sulphur

Iron ore, coal and lime stone

Iron ore, carbon and lime stone

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

Grey or foundry pig

Bessemer pig

Mottled pig

White or forge pig

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

Sulphur

Phosphorus

Carbon

Silicon

12. 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

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

Iron

Sulphur

Carbon

Manganese

14. 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

15. 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

16. A heavy stone is suitable for

Arches

Retaining walls

Roads

Rubble masonry

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

Water varnish

Spirit varnish

Turpentine varnish

Oil varnish

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

2.2 kg

1.5 kg

None of these

3.2 kg

19. The commonly used lime in white washing, is

White lime

Quick lime

Hydraulic lime

Fat lime

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

3.5 N/mm²

10.5 N/mm²

7.0 N/mm²

14.0 N/mm²

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

50 to 60 %

5 to 10 %

20 to 30 %

70 to 80 %

22. Durability of building stone is affected by its

Chemical composition

All the above

Resistance to atmosphere

Texture

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

Brick bats

Stretchers

Queen closer

Headers

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

Stainless steel

Bessemer steel

Cast steel

Mild steel

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

Actinolite asbestos

Anthophylite asbestos

All of these

Amosite asbestos

26. Granite is not suitable for ordinary building purpose because

It has less crushing strength

It is not a fireproof material

It is costly

It cannot be polished

27. Quick lime (or caustic lime)

All of these

Is obtained by the calcination of pure lime stone

Has great affinity to moisture

Is amorphous

28. 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

29. The slump recommended for mass concrete is about

125 mm to 150 mm

100 mm to 125 mm

50 mm to 100 mm

25 mm to 50 mm

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

(B) Are affected by moisture

(A) Split easily

(C) Both (A) and (B)

None of these

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

25 %

15 %

10 %

20 %

32. 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

33. Excess of silica in brick earth results in

Enhancing the impermeability of bricks

Cracking and warping of bricks

Loss of cohesion

None of these

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

Dampness

All of these

Absence of sunlight

Presence of sap

35. The hardest rock is

Diamond

Quartz

Talc

Marble

36. Plywood is made from

Bamboo fibre

Common timber

Teak wood only

Asbestos sheets

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

compressive strength of cement

Soundness of cement

Tensile strength of cement

Setting time of cement

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

Polyvinylchloride

Polystyrene

Polypropylene

All of these

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

Vanadium

Manganese

Chromium

Nickel

40. Lacquer paints

Are generally applied on structural steel

All of these

Consist of resin and nitro-cellulose

Are less durable as compared to enamel paints

Building Materials MCQs Set-9

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