Building Material MCQs Set-6

Page 1 of 4

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

At 60° to the direction of bedding planes

Perpendicular to the direction of bedding planes

At 45° to the direction of bedding planes

Along the direction of bedding planes

2. Cast iron contains carbon approximately

1.5% to 5.5%

0.05% to 1.75%

None of these

0.250 %

3. The main ingredients of Portland cement are

Lime and iron

Lime and silica

Lime and alumina

Silica and alumina

4. Which of the following trees yields hard wood?

Pine

Shishum

Deodar

Chir

5. 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

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

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

All of these

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

7. Strength of cement concrete primarily depends upon

Quantity of cement

Water-cement ratio

Quality of water

Quantity of aggregate

8. After storage, the strength of cement

Decreases

Increases

May increase or decrease

Remains same

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

Clay

Feldspar

Quartz

All of these

10. Non acid-resistant asbestos is:

Chrysotile asbestos

None of these

Amosite asbestos

Tremolite asbestos

Page 2 of 4

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

Calcium carbonate

Calcium chloride

None of the above

Gypsum

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

1 : 4

1 : 2

1 : 8

1 : 6

13. Gypsum is a

Igneous rock

Metamorphic rock

Chemically precipitated sedimentary rock

Mechanically formed sedimentary rock

14. 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

Alumina

Lime

Iron-oxide

15. Soundness of cement is tested by

Compressive strength testing apparatus

Le-chatelier apparatus

None of these

Vicat's apparatus

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

520 N/mm²

260 N/mm²

420 N/mm²

160 N/mm²

17. Gypsum consists of

Lime and H₂O

CaSO4 and H₂O

H₂S and CO₂

CO₂ and calcium

18. For sanitary pipes and chemical stonewares,

Opaque glazing is used

Lead glazing is used

Salt glazing is used

None of these

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

Augite

All of these

Biotite

Hornblende

20. Bitumen may be dissolved in

Carbondioxide

Sodium chloride

Carbon disulphide

Water

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21. 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

Greater than 1

Less than 1

Equal to 1

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

English bond

Zigzag bond

Double Flemish bond

Single Flemish bond

23. First class timber has an average life of

5 to 10 years

Less than one year

More than 10 years

1 to 5 years

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

Fracture

Cleavage

Texture

Structure

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

100 mm

150 mm

70.6 mm

50 mm

26. Blister steel

Is obtained by cementation process

All of these

Is full of fissures and cavities

Can be easily welded

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

All of these

25, 75

35, 65

30, 70

28. Asbestos

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

Contains iron oxide and alumina

Is a natural fibrous mineral substance

All of these

29. Pick up the correct statement from the following:

All of these

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

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

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

Iron

Magnesia

Silica

Alumina

Page 4 of 4

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

Quartzite

Granite

Sand stone

Lime stone

32. Seasoning of timber is done

To make it water proof

To increase its temperature

To remove water

To paint its surface

33. Hydraulic lime is obtained by

Resin, oil and turpentine

Oil, wax and resin

Synthetic resin and spirit

Spirit, oil and wax

34. The most commonly used retarder in cement is

Gypsum

Calcium chloride

None of the above

Calcium carbonate

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

Alkalies and magnesium

Alumina and iron

Lime stone and alumina

Silica and alkalies

36. A queen closer is a

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

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

37. The main function of alumina in brick earth is

To make the brick durable

To impart plasticity

To make the brick impermeable

To prevent shrinkage

38. Which of the following is a rock?

Gypsum

None of these

Mica

Quartz

39. A bull nose brick is not used for

Rounding off sharp corners

Pillars

Arches

Decoration purpose

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

Igneous rocks

Plutonic rocks

Hypabyssal rocks

Volcanic rocks

Building Material MCQs Set-6

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