Building Material MCQs Set-6

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1. The most commonly used retarder in cement is

None of the above

Calcium carbonate

Calcium chloride

Gypsum

2. For sanitary pipes and chemical stonewares,

Lead glazing is used

Opaque glazing is used

None of these

Salt glazing is used

3. Strength of cement concrete primarily depends upon

Quantity of cement

Quality of water

Quantity of aggregate

Water-cement ratio

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

260 N/mm²

160 N/mm²

420 N/mm²

520 N/mm²

5. Non acid-resistant asbestos is:

Amosite asbestos

Chrysotile asbestos

Tremolite asbestos

None of these

6. Blister steel

All of these

Is full of fissures and cavities

Can be easily welded

Is obtained by cementation process

7. The main function of alumina in brick earth is

To make the brick impermeable

To prevent shrinkage

To impart plasticity

To make the brick durable

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

Double Flemish bond

English bond

Zigzag bond

Single Flemish bond

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

All of these

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

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

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

10. Gypsum is a

Chemically precipitated sedimentary rock

Igneous rock

Metamorphic rock

Mechanically formed sedimentary rock

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

At 45° to the direction of bedding planes

Along the direction of bedding planes

At 60° to the direction of bedding planes

Perpendicular to the direction of bedding planes

12. A queen closer is a

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

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

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

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

13. Asbestos

Contains iron oxide and alumina

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

All of these

Is a natural fibrous mineral substance

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

Sand stone

Quartzite

Granite

Lime stone

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

25, 75

All of these

30, 70

35, 65

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

50 mm

150 mm

70.6 mm

100 mm

17. Which of the following trees yields hard wood?

Pine

Chir

Shishum

Deodar

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

Biotite

Augite

Hornblende

All of these

19. 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

20. Seasoning of timber is done

To remove water

To increase its temperature

To paint its surface

To make it water proof

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21. First class timber has an average life of

Less than one year

5 to 10 years

More than 10 years

1 to 5 years

22. 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

Magnesia

Lime

Alumina

23. Hydraulic lime is obtained by

Spirit, oil and wax

Synthetic resin and spirit

Oil, wax and resin

Resin, oil and turpentine

24. Cast iron

Is manufactured in required shapes

All of these

Is obtained by purifying pig iron

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

25. The main ingredients of Portland cement are

Lime and alumina

Lime and silica

Lime and iron

Silica and alumina

26. Cast iron contains carbon approximately

0.05% to 1.75%

1.5% to 5.5%

0.250 %

None of these

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

Quartz

Clay

All of these

Feldspar

28. Bitumen may be dissolved in

Carbon disulphide

Water

Sodium chloride

Carbondioxide

29. Gypsum consists of

CaSO4 and H₂O

Lime and H₂O

CO₂ and calcium

H₂S and CO₂

30. After storage, the strength of cement

Decreases

May increase or decrease

Increases

Remains same

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

Greater than 1

Equal to 1

Less than 1

Less than 1 in beams but greater than 1 in channels

32. A bull nose brick is not used for

Decoration purpose

Rounding off sharp corners

Pillars

Arches

33. Which of the following is a rock?

None of these

Gypsum

Quartz

Mica

34. Pick up the correct statement from the following:

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

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

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

All of these

35. Soundness of cement is tested by

None of these

Compressive strength testing apparatus

Vicat's apparatus

Le-chatelier apparatus

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

Silica

Alumina

Iron

Magnesia

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

Hypabyssal rocks

Plutonic rocks

Volcanic rocks

Igneous rocks

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

Gypsum

Calcium carbonate

Calcium chloride

None of the above

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

1 : 4

1 : 2

1 : 8

1 : 6

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

Fracture

Structure

Cleavage

Texture

Building Material MCQs Set-6

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