Building Material MCQs Set-6

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

Alkalies and magnesium

Silica and alkalies

Lime stone and alumina

Alumina and iron

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

100 mm

150 mm

50 mm

70.6 mm

3. Pick up the correct statement from the following:

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

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

4. For sanitary pipes and chemical stonewares,

Opaque glazing is used

None of these

Salt glazing is used

Lead glazing is used

5. The main ingredients of Portland cement are

Lime and silica

Silica and alumina

Lime and alumina

Lime and iron

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

1 : 6

1 : 8

1 : 4

1 : 2

7. After storage, the strength of cement

Remains same

May increase or decrease

Increases

Decreases

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

520 N/mm²

420 N/mm²

160 N/mm²

260 N/mm²

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

Quartz

Clay

Feldspar

All of these

10. Soundness of cement is tested by

Le-chatelier apparatus

None of these

Compressive strength testing apparatus

Vicat's apparatus

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11. Gypsum is a

Chemically precipitated sedimentary rock

Mechanically formed sedimentary rock

Igneous rock

Metamorphic rock

12. Non acid-resistant asbestos is:

Chrysotile asbestos

None of these

Tremolite asbestos

Amosite asbestos

13. Seasoning of timber is done

To increase its temperature

To remove water

To paint its surface

To make it water proof

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

35, 65

25, 75

All of these

30, 70

15. First class timber has an average life of

More than 10 years

Less than one year

1 to 5 years

5 to 10 years

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

Biotite

All of these

Hornblende

Augite

17. A bull nose brick is not used for

Pillars

Decoration purpose

Rounding off sharp corners

Arches

18. Hydraulic lime is obtained by

Synthetic resin and spirit

Resin, oil and turpentine

Oil, wax and resin

Spirit, oil and wax

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

Magnesia

Lime

Alumina

Iron-oxide

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

At 60° to the direction of bedding planes

Along the direction of bedding planes

Perpendicular to the direction of bedding planes

At 45° to the direction of bedding planes

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21. The main function of alumina in brick earth is

To impart plasticity

To make the brick impermeable

To prevent shrinkage

To make the brick durable

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

Gypsum

None of the above

Calcium carbonate

Calcium chloride

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

Iron

Alumina

Silica

Magnesia

24. Gypsum consists of

Lime and H₂O

CaSO4 and H₂O

H₂S and CO₂

CO₂ and calcium

25. 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

Volcanic rocks

Plutonic rocks

26. Cast iron contains carbon approximately

0.250 %

1.5% to 5.5%

0.05% to 1.75%

None of these

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

Less than 1 in beams but greater than 1 in channels

Less than 1

Equal to 1

Greater than 1

28. Which of the following trees yields hard wood?

Deodar

Chir

Pine

Shishum

29. Which of the following is a rock?

Mica

None of these

Quartz

Gypsum

30. A queen closer is a

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

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

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

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31. The most commonly used retarder in cement is

None of the above

Gypsum

Calcium carbonate

Calcium chloride

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

Structure

Fracture

Cleavage

Texture

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

Quartzite

Lime stone

Sand stone

Granite

34. Strength of cement concrete primarily depends upon

Quantity of cement

Quality of water

Quantity of aggregate

Water-cement ratio

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

Double Flemish bond

Zigzag bond

Single Flemish bond

English bond

36. 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

37. Cast iron

Is manufactured in required shapes

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

Is obtained by purifying pig iron

All of these

38. Bitumen may be dissolved in

Sodium chloride

Carbon disulphide

Carbondioxide

Water

39. 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

40. Blister steel

Is obtained by cementation process

Can be easily welded

All of these

Is full of fissures and cavities

Building Material MCQs Set-6

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