Building Material MCQs Set-6

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1. Which of the following stone is best suited for construction of piers and abutments of a railway bridge?

Granite

Sand stone

Lime stone

Quartzite

2. A queen closer is a

Brick having the same length and depth as the other bricks but half the breadth

Brick laid with its breadth parallel to the face or direction of wall

Brick with half the width at one end and full width at the other

Brick laid with its length parallel to the face or direction of wall

3. Which of the following trees yields hard wood?

Deodar

Chir

Pine

Shishum

4. Cast iron

Is obtained by purifying pig iron

Is manufactured in required shapes

May contain 2 to 5 per cent of carbon with other impurities

All of these

5. The most common admixture which is used to accelerate the initial set of concrete is

Calcium carbonate

Calcium chloride

Gypsum

None of the above

6. A bull nose brick is not used for

Rounding off sharp corners

Pillars

Arches

Decoration purpose

7. Chlorite, a green colour mineral is mainly derived from the decomposition of

All of these

Biotite

Augite

Hornblende

8. The rocks which are formed due to cooling of magma at a relatively shallow depth from the earth's surface are called

Hypabyssal rocks

Igneous rocks

Plutonic rocks

Volcanic rocks

9. Non acid-resistant asbestos is:

Chrysotile asbestos

None of these

Tremolite asbestos

Amosite asbestos

10. Bitumen may be dissolved in

Carbon disulphide

Carbondioxide

Sodium chloride

Water

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11. The pressure acting on the stones in stone masonry construction should be

Perpendicular to the direction of bedding planes

At 60° to the direction of bedding planes

Along the direction of bedding planes

At 45° to the direction of bedding planes

12. When a brick is immersed in water for 24 hours and then dried, if

50 percent surface is covered with grey or white deposits, the brick has serious efflorescence

No grey or white deposits appear on the surface, the brick is free from soluble salts

All of these

10 percent surface is covered with grey or white deposits, the brick has slight efflorescence

13. Gypsum consists of

CO₂ and calcium

CaSO4 and H₂O

H₂S and CO₂

Lime and H₂O

14. Gypsum is a

Mechanically formed sedimentary rock

Igneous rock

Chemically precipitated sedimentary rock

Metamorphic rock

15. The main function of alumina in brick earth is

To make the brick durable

To impart plasticity

To prevent shrinkage

To make the brick impermeable

16. Which of the following ingredients of the brick earth enables the brick to retain its shape?

Alumina

Iron

Magnesia

Silica

17. The proportions of lime and sand in the mortar normally used in brick construction are

1 : 4

1 : 2

1 : 8

1 : 6

18. The ultimate tensile strength of structural mild steel is about

160 N/mm²

260 N/mm²

420 N/mm²

520 N/mm²

19. Pick up the correct statement from the following:

All of these

Crawling paints may be cured by sand preparing the surface and giving a fresh coat with plenty of turps

Cracked paints may be cured by removing paint and giving a fresh coat of paint

Blistering may be cured by applying water paint finished with oil paint dried with a little copal varnish

20. The most commonly used retarder in cement is

None of the above

Calcium carbonate

Calcium chloride

Gypsum

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21. Soundness of cement is tested by

None of these

Compressive strength testing apparatus

Le-chatelier apparatus

Vicat's apparatus

22. Hydraulic lime is obtained by

Spirit, oil and wax

Synthetic resin and spirit

Oil, wax and resin

Resin, oil and turpentine

23. Asbestos

All of these

Is composed of hydrous silicates of calcium and magnesium (CaSiO3, 3MgSiO3)

Contains iron oxide and alumina

Is a natural fibrous mineral substance

24. Pick up the constituent of good brick earth whose excess causes the raw bricks shrink and warp during drying and burning, from the following:

Iron-oxide

Alumina

Lime

Magnesia

25. Which of the following is a rock?

None of these

Gypsum

Quartz

Mica

26. The tendency of a stone is, to split along:

Cleavage

Texture

Fracture

Structure

27. The ratio of the thickness of web to that of flange of steel rolled structural beams and channels is

Less than 1

Greater than 1

Equal to 1

Less than 1 in beams but greater than 1 in channels

28. Blister steel

Is obtained by cementation process

Is full of fissures and cavities

Can be easily welded

All of these

29. For sanitary pipes and chemical stonewares,

Salt glazing is used

Lead glazing is used

Opaque glazing is used

None of these

30. Cast iron contains carbon approximately

1.5% to 5.5%

0.250 %

0.05% to 1.75%

None of these

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31. Seasoning of timber is done

To make it water proof

To increase its temperature

To remove water

To paint its surface

32. Which one of the following is used for preparing porcelain?

Clay

Feldspar

Quartz

All of these

33. The main ingredients of Portland cement are

Silica and alumina

Lime and silica

Lime and alumina

Lime and iron

34. Strength of cement concrete primarily depends upon

Water-cement ratio

Quality of water

Quantity of aggregate

Quantity of cement

35. Which of the following pairs gives a correct combination of the useful and harmful constituents respectively of a good brick earth?

Silica and alkalies

Alkalies and magnesium

Lime stone and alumina

Alumina and iron

36. The type of bond provided in brick masonry for carrying heavy loads is

Single Flemish bond

Double Flemish bond

Zigzag bond

English bond

37. After storage, the strength of cement

May increase or decrease

Increases

Remains same

Decreases

38. First class timber has an average life of

1 to 5 years

More than 10 years

Less than one year

5 to 10 years

39. For testing compressive strength of cement, the size of cube used is

100 mm

150 mm

70.6 mm

50 mm

40. The percentage of alumina and silica in good fire clay vary respectively is

30, 70

All of these

35, 65

25, 75

Building Material MCQs Set-6

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