Building Material MCQs Set-6

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1. Gypsum consists of

CaSO4 and H₂O

CO₂ and calcium

H₂S and CO₂

Lime and H₂O

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

Plutonic rocks

Hypabyssal rocks

Volcanic rocks

Igneous rocks

3. 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

Iron-oxide

Alumina

Lime

4. Hydraulic lime is obtained by

Spirit, oil and wax

Synthetic resin and spirit

Oil, wax and resin

Resin, oil and turpentine

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

Hornblende

Biotite

All of these

Augite

6. After storage, the strength of cement

Decreases

Increases

May increase or decrease

Remains same

7. First class timber has an average life of

1 to 5 years

More than 10 years

Less than one year

5 to 10 years

8. Strength of cement concrete primarily depends upon

Water-cement ratio

Quality of water

Quantity of aggregate

Quantity of cement

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

1 : 8

1 : 4

1 : 6

1 : 2

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

Feldspar

All of these

Clay

Quartz

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11. Blister steel

All of these

Is obtained by cementation process

Can be easily welded

Is full of fissures and cavities

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

At 60° to the direction of bedding planes

At 45° to the direction of bedding planes

Perpendicular to the direction of bedding planes

Along the direction of bedding planes

13. Cast iron contains carbon approximately

0.250 %

None of these

0.05% to 1.75%

1.5% to 5.5%

14. Non acid-resistant asbestos is:

Chrysotile asbestos

Tremolite asbestos

Amosite asbestos

None of these

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

Alkalies and magnesium

Lime stone and alumina

Silica and alkalies

Alumina and iron

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

35, 65

25, 75

30, 70

All of these

17. The most commonly used retarder in cement is

None of the above

Gypsum

Calcium chloride

Calcium carbonate

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

Single Flemish bond

English bond

Double Flemish bond

Zigzag bond

19. 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

20. Soundness of cement is tested by

None of these

Vicat's apparatus

Compressive strength testing apparatus

Le-chatelier apparatus

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

Fracture

Texture

Structure

Cleavage

22. 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 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

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

160 N/mm²

420 N/mm²

520 N/mm²

260 N/mm²

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

Lime stone

Quartzite

Granite

Sand stone

25. 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

26. Cast iron

All of these

Is manufactured in required shapes

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

Is obtained by purifying pig iron

27. Gypsum is a

Metamorphic rock

Igneous rock

Mechanically formed sedimentary rock

Chemically precipitated sedimentary rock

28. For sanitary pipes and chemical stonewares,

Opaque glazing is used

None of these

Salt glazing is used

Lead glazing is used

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

Silica

Iron

Alumina

Magnesia

30. Seasoning of timber is done

To remove water

To paint its surface

To make it water proof

To increase its temperature

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31. Which of the following is a rock?

Gypsum

None of these

Mica

Quartz

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

All of these

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

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

33. Bitumen may be dissolved in

Carbondioxide

Water

Carbon disulphide

Sodium chloride

34. The main ingredients of Portland cement are

Lime and alumina

Silica and alumina

Lime and iron

Lime and silica

35. A bull nose brick is not used for

Arches

Rounding off sharp corners

Decoration purpose

Pillars

36. Asbestos

Is a natural fibrous mineral substance

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

Contains iron oxide and alumina

All of these

37. 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

Greater than 1

Equal to 1

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

Gypsum

Calcium chloride

None of the above

Calcium carbonate

39. Which of the following trees yields hard wood?

Shishum

Chir

Pine

Deodar

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

70.6 mm

100 mm

150 mm

50 mm

Building Material MCQs Set-6

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