Building Material MCQs Set-6

Page 1 of 4

1. Non acid-resistant asbestos is:

Tremolite asbestos

Amosite asbestos

None of these

Chrysotile asbestos

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

Cleavage

Structure

Texture

Fracture

3. 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

At 45° to the direction of bedding planes

Perpendicular to the direction of bedding planes

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

All of these

Clay

Quartz

Feldspar

5. Strength of cement concrete primarily depends upon

Water-cement ratio

Quantity of cement

Quantity of aggregate

Quality of water

6. 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

Magnesia

Lime

7. Gypsum is a

Igneous rock

Metamorphic rock

Chemically precipitated sedimentary rock

Mechanically formed sedimentary rock

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

Silica and alkalies

Alumina and iron

Lime stone and alumina

Alkalies and magnesium

9. Cast iron contains carbon approximately

None of these

0.250 %

1.5% to 5.5%

0.05% to 1.75%

10. Gypsum consists of

CaSO4 and H₂O

CO₂ and calcium

Lime and H₂O

H₂S and CO₂

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

Sand stone

Quartzite

Granite

Lime stone

12. Which of the following is a rock?

Quartz

None of these

Mica

Gypsum

13. A bull nose brick is not used for

Arches

Decoration purpose

Rounding off sharp corners

Pillars

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

50 mm

150 mm

100 mm

70.6 mm

15. Soundness of cement is tested by

None of these

Compressive strength testing apparatus

Le-chatelier apparatus

Vicat's apparatus

16. Which of the following trees yields hard wood?

Pine

Shishum

Chir

Deodar

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

All of these

25, 75

30, 70

35, 65

18. A queen closer is a

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

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

19. Cast iron

Is manufactured in required shapes

All of these

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

Is obtained by purifying pig iron

20. First class timber has an average life of

Less than one year

5 to 10 years

1 to 5 years

More than 10 years

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

Biotite

All of these

Augite

Hornblende

22. After storage, the strength of cement

May increase or decrease

Increases

Remains same

Decreases

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

Silica

Alumina

Iron

Magnesia

24. Hydraulic lime is obtained by

Synthetic resin and spirit

Spirit, oil and wax

Oil, wax and resin

Resin, oil and turpentine

25. 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

26. The main ingredients of Portland cement are

Lime and silica

Lime and alumina

Lime and iron

Silica and alumina

27. Bitumen may be dissolved in

Carbon disulphide

Carbondioxide

Water

Sodium chloride

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

Volcanic rocks

Plutonic rocks

Igneous rocks

Hypabyssal rocks

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

None of the above

Calcium carbonate

Gypsum

Calcium chloride

30. For sanitary pipes and chemical stonewares,

Opaque glazing is used

None of these

Lead glazing is used

Salt glazing is used

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31. The most commonly used retarder in cement is

Gypsum

Calcium carbonate

None of the above

Calcium chloride

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

1 : 2

1 : 8

1 : 6

1 : 4

33. Blister steel

All of these

Can be easily welded

Is full of fissures and cavities

Is obtained by cementation process

34. Seasoning of timber is done

To increase its temperature

To make it water proof

To paint its surface

To remove water

35. The main function of alumina in brick earth is

To make the brick durable

To make the brick impermeable

To impart plasticity

To prevent shrinkage

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

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

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

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

Single Flemish bond

Double Flemish bond

English bond

Zigzag bond

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

420 N/mm²

520 N/mm²

260 N/mm²

160 N/mm²

39. 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

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

All of these

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

40. 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

Building Material MCQs Set-6

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