Building Material MCQs Set-6

Page 1 of 4

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

30, 70

All of these

35, 65

25, 75

2. 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

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

3. Hydraulic lime is obtained by

Oil, wax and resin

Spirit, oil and wax

Synthetic resin and spirit

Resin, oil and turpentine

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

1 : 8

1 : 6

1 : 2

1 : 4

5. Bitumen may be dissolved in

Carbon disulphide

Carbondioxide

Water

Sodium chloride

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

Iron

Magnesia

Silica

Alumina

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

Quartzite

Sand stone

Lime stone

Granite

8. The main ingredients of Portland cement are

Silica and alumina

Lime and silica

Lime and alumina

Lime and iron

9. First class timber has an average life of

1 to 5 years

5 to 10 years

More than 10 years

Less than one year

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

Lime stone and alumina

Alkalies and magnesium

Alumina and iron

Silica and alkalies

Page 2 of 4

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

Calcium chloride

None of the above

Gypsum

Calcium carbonate

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

Biotite

All of these

Augite

Hornblende

13. Soundness of cement is tested by

Le-chatelier apparatus

Compressive strength testing apparatus

None of these

Vicat's apparatus

14. For sanitary pipes and chemical stonewares,

Opaque glazing is used

Lead glazing is used

None of these

Salt glazing is used

15. 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

Equal to 1

Less than 1

Greater than 1

16. A bull nose brick is not used for

Pillars

Decoration purpose

Rounding off sharp corners

Arches

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

Quartz

All of these

Clay

Feldspar

18. Which of the following is a rock?

Gypsum

Mica

None of these

Quartz

19. After storage, the strength of cement

Decreases

Increases

May increase or decrease

Remains same

20. Gypsum is a

Igneous rock

Mechanically formed sedimentary rock

Chemically precipitated sedimentary rock

Metamorphic rock

Page 3 of 4

21. Non acid-resistant asbestos is:

Chrysotile asbestos

None of these

Amosite asbestos

Tremolite asbestos

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

160 N/mm²

520 N/mm²

420 N/mm²

260 N/mm²

23. Blister steel

Is obtained by cementation process

Can be easily welded

Is full of fissures and cavities

All of these

24. 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

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

All of these

50 percent surface is covered with grey or white deposits, the brick has serious efflorescence

25. Gypsum consists of

H₂S and CO₂

Lime and H₂O

CO₂ and calcium

CaSO4 and H₂O

26. 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

Along the direction of bedding planes

At 45° to the direction of bedding planes

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

Structure

Texture

Fracture

Cleavage

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

Hypabyssal rocks

Volcanic rocks

Plutonic rocks

Igneous rocks

29. 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

30. The most commonly used retarder in cement is

Gypsum

None of the above

Calcium carbonate

Calcium chloride

Page 4 of 4

31. Strength of cement concrete primarily depends upon

Water-cement ratio

Quality of water

Quantity of aggregate

Quantity of cement

32. 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

Magnesia

Lime

Alumina

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

Zigzag bond

Double Flemish bond

English bond

Single Flemish bond

34. Seasoning of timber is done

To paint its surface

To make it water proof

To increase its temperature

To remove water

35. Which of the following trees yields hard wood?

Deodar

Chir

Pine

Shishum

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

100 mm

50 mm

150 mm

70.6 mm

37. The main function of alumina in brick earth is

To make the brick impermeable

To make the brick durable

To impart plasticity

To prevent shrinkage

38. Cast iron contains carbon approximately

None of these

0.250 %

1.5% to 5.5%

0.05% to 1.75%

39. Asbestos

All of these

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

Is a natural fibrous mineral substance

Contains iron oxide and alumina

40. A queen closer is a

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

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

Building Material MCQs Set-6

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