Building Material MCQs Set-6

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1. The most commonly used retarder in cement is

Calcium chloride

Calcium carbonate

Gypsum

None of the above

2. Seasoning of timber is done

To paint its surface

To increase its temperature

To remove water

To make it water proof

3. Soundness of cement is tested by

Compressive strength testing apparatus

Vicat's apparatus

Le-chatelier apparatus

None of these

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

Lime stone

Sand stone

Quartzite

Granite

5. Gypsum is a

Igneous rock

Chemically precipitated sedimentary rock

Metamorphic rock

Mechanically formed sedimentary rock

6. Strength of cement concrete primarily depends upon

Quantity of aggregate

Water-cement ratio

Quantity of cement

Quality of water

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

1 : 4

1 : 6

1 : 8

1 : 2

8. Non acid-resistant asbestos is:

Chrysotile asbestos

Amosite asbestos

Tremolite asbestos

None of these

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

Lime

Alumina

Iron-oxide

Magnesia

10. The main function of alumina in brick earth is

To make the brick impermeable

To make the brick durable

To prevent shrinkage

To impart plasticity

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

English bond

Single Flemish bond

Zigzag bond

Double Flemish bond

12. The main ingredients of Portland cement are

Lime and iron

Lime and alumina

Lime and silica

Silica and alumina

13. Asbestos

Contains iron oxide and alumina

All of these

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

Is a natural fibrous mineral substance

14. Hydraulic lime is obtained by

Spirit, oil and wax

Resin, oil and turpentine

Synthetic resin and spirit

Oil, wax and resin

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

50 mm

70.6 mm

150 mm

100 mm

16. A queen closer is a

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

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

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

17. First class timber has an average life of

Less than one year

More than 10 years

1 to 5 years

5 to 10 years

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

Equal to 1

Less than 1

Less than 1 in beams but greater than 1 in channels

Greater than 1

19. Which of the following trees yields hard wood?

Chir

Pine

Deodar

Shishum

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

160 N/mm²

260 N/mm²

520 N/mm²

420 N/mm²

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

Silica and alkalies

Lime stone and alumina

Alkalies and magnesium

Alumina and iron

22. For sanitary pipes and chemical stonewares,

None of these

Salt glazing is used

Opaque glazing is used

Lead glazing is used

23. Bitumen may be dissolved in

Sodium chloride

Carbon disulphide

Carbondioxide

Water

24. Pick up the correct statement from the following:

All of these

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

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

25. Blister steel

Is full of fissures and cavities

Is obtained by cementation process

All of these

Can be easily welded

26. Cast iron

Is obtained by purifying pig iron

All of these

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

Is manufactured in required shapes

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

Quartz

All of these

Feldspar

Clay

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

Magnesia

Iron

Alumina

Silica

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

None of the above

Gypsum

Calcium carbonate

Calcium chloride

30. Gypsum consists of

CO₂ and calcium

Lime and H₂O

H₂S and CO₂

CaSO4 and H₂O

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31. 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

All of these

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

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

32. Which of the following is a rock?

Mica

None of these

Quartz

Gypsum

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

30, 70

25, 75

All of these

35, 65

34. A bull nose brick is not used for

Rounding off sharp corners

Pillars

Arches

Decoration purpose

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

All of these

Augite

Hornblende

Biotite

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

Igneous rocks

Volcanic rocks

Plutonic rocks

Hypabyssal rocks

37. After storage, the strength of cement

Increases

Remains same

Decreases

May increase or decrease

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

Texture

Fracture

Cleavage

Structure

39. Cast iron contains carbon approximately

None of these

0.05% to 1.75%

0.250 %

1.5% to 5.5%

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

At 45° to the direction of bedding planes

Perpendicular to the direction of bedding planes

Along the direction of bedding planes

At 60° to the direction of bedding planes

Building Material MCQs Set-6

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