Building Material MCQs Set-6

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1. 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

Greater than 1

Less than 1

2. Which of the following is a rock?

None of these

Mica

Gypsum

Quartz

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

50 mm

70.6 mm

150 mm

100 mm

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

Quartz

All of these

Clay

Feldspar

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

All of these

Biotite

Hornblende

Augite

6. A bull nose brick is not used for

Arches

Decoration purpose

Pillars

Rounding off sharp corners

7. The main ingredients of Portland cement are

Silica and alumina

Lime and silica

Lime and iron

Lime and alumina

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

Hypabyssal rocks

Plutonic rocks

Volcanic rocks

Igneous rocks

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

Calcium chloride

None of the above

Gypsum

Calcium carbonate

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

Lime

Iron-oxide

Magnesia

Alumina

Page 2 of 4

11. 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

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

Fracture

Structure

Cleavage

Texture

13. Non acid-resistant asbestos is:

Tremolite asbestos

Amosite asbestos

None of these

Chrysotile asbestos

14. Gypsum consists of

Lime and H₂O

CO₂ and calcium

H₂S and CO₂

CaSO4 and H₂O

15. The most commonly used retarder in cement is

Calcium carbonate

Gypsum

Calcium chloride

None of the above

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

Alumina and iron

Silica and alkalies

Alkalies and magnesium

Lime stone and alumina

17. 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

18. First class timber has an average life of

More than 10 years

1 to 5 years

Less than one year

5 to 10 years

19. Cast iron contains carbon approximately

None of these

0.05% to 1.75%

0.250 %

1.5% to 5.5%

20. Blister steel

Can be easily welded

Is obtained by cementation process

Is full of fissures and cavities

All of these

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

Single Flemish bond

English bond

Double Flemish bond

Zigzag bond

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

Lime stone

Granite

Quartzite

Sand stone

23. Strength of cement concrete primarily depends upon

Quality of water

Water-cement ratio

Quantity of cement

Quantity of aggregate

24. The main function of alumina in brick earth is

To prevent shrinkage

To impart plasticity

To make the brick durable

To make the brick impermeable

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

260 N/mm²

160 N/mm²

520 N/mm²

420 N/mm²

26. Hydraulic lime is obtained by

Synthetic resin and spirit

Oil, wax and resin

Spirit, oil and wax

Resin, oil and turpentine

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

At 45° to the direction of bedding planes

At 60° to the direction of bedding planes

Perpendicular to the direction of bedding planes

Along the direction of bedding planes

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

Iron

Magnesia

Alumina

Silica

29. Asbestos

Contains iron oxide and alumina

Is a natural fibrous mineral substance

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

All of these

30. After storage, the strength of cement

May increase or decrease

Remains same

Decreases

Increases

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31. Soundness of cement is tested by

Vicat's apparatus

None of these

Compressive strength testing apparatus

Le-chatelier apparatus

32. Bitumen may be dissolved in

Water

Sodium chloride

Carbondioxide

Carbon disulphide

33. A queen closer is a

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

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

34. Which of the following trees yields hard wood?

Shishum

Pine

Chir

Deodar

35. Gypsum is a

Metamorphic rock

Igneous rock

Mechanically formed sedimentary rock

Chemically precipitated sedimentary rock

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

35, 65

30, 70

25, 75

All of these

37. 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

38. For sanitary pipes and chemical stonewares,

Lead glazing is used

Salt glazing is used

Opaque glazing is used

None of these

39. Seasoning of timber is done

To increase its temperature

To paint its surface

To make it water proof

To remove water

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

1 : 2

1 : 8

1 : 6

1 : 4

Building Material MCQs Set-6

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