Building Material MCQs Set-6

Page 1 of 4

1. Gypsum is a

Mechanically formed sedimentary rock

Igneous rock

Chemically precipitated sedimentary rock

Metamorphic rock

2. 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

3. Gypsum consists of

H₂S and CO₂

CaSO4 and H₂O

CO₂ and calcium

Lime and H₂O

4. Soundness of cement is tested by

Compressive strength testing apparatus

Vicat's apparatus

None of these

Le-chatelier apparatus

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

100 mm

150 mm

70.6 mm

50 mm

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:

Lime

Alumina

Magnesia

Iron-oxide

7. After storage, the strength of cement

May increase or decrease

Increases

Remains same

Decreases

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

1 : 8

1 : 2

1 : 6

1 : 4

9. Cast iron contains carbon approximately

0.05% to 1.75%

1.5% to 5.5%

None of these

0.250 %

10. Strength of cement concrete primarily depends upon

Water-cement ratio

Quantity of aggregate

Quantity of cement

Quality of water

Page 2 of 4

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

Clay

Feldspar

Quartz

All of these

12. Which of the following trees yields hard wood?

Chir

Pine

Shishum

Deodar

13. Hydraulic lime is obtained by

Resin, oil and turpentine

Spirit, oil and wax

Synthetic resin and spirit

Oil, wax and resin

14. The ratio of the thickness of web to that of flange of steel rolled structural beams and channels is

Greater than 1

Less than 1

Less than 1 in beams but greater than 1 in channels

Equal to 1

15. Cast iron

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

All of these

Is manufactured in required shapes

Is obtained by purifying pig iron

16. Asbestos

Contains iron oxide and alumina

All of these

Is a natural fibrous mineral substance

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

17. A bull nose brick is not used for

Rounding off sharp corners

Pillars

Decoration purpose

Arches

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. Pick up the correct statement from the following:

All of these

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

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

Crawling paints may be cured by sand preparing the surface and giving a fresh coat with plenty of turps

20. 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

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

Granite

Sand stone

Quartzite

Lime stone

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

Calcium carbonate

Calcium chloride

Gypsum

None of the above

23. The most commonly used retarder in cement is

Calcium carbonate

Calcium chloride

None of the above

Gypsum

24. Which of the following is a rock?

Gypsum

Mica

None of these

Quartz

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

Single Flemish bond

Double Flemish bond

English bond

Zigzag bond

26. The main function of alumina in brick earth is

To make the brick durable

To prevent shrinkage

To impart plasticity

To make the brick impermeable

27. The main ingredients of Portland cement are

Silica and alumina

Lime and silica

Lime and alumina

Lime and iron

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

Perpendicular to the direction of bedding planes

At 60° to the direction of bedding planes

At 45° to the direction of bedding planes

Along the direction of bedding planes

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

Biotite

All of these

Hornblende

Augite

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

520 N/mm²

260 N/mm²

420 N/mm²

160 N/mm²

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31. Seasoning of timber is done

To paint its surface

To remove water

To increase its temperature

To make it water proof

32. Non acid-resistant asbestos is:

None of these

Tremolite asbestos

Chrysotile asbestos

Amosite asbestos

33. Blister steel

All of these

Is full of fissures and cavities

Is obtained by cementation process

Can be easily welded

34. A queen closer is a

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

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

35. Bitumen may be dissolved in

Carbon disulphide

Water

Sodium chloride

Carbondioxide

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

Texture

Structure

Fracture

Cleavage

37. 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

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

25, 75

35, 65

All of these

30, 70

39. For sanitary pipes and chemical stonewares,

Lead glazing is used

None of these

Salt glazing is used

Opaque glazing is used

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

Iron

Alumina

Magnesia

Silica

Building Material MCQs Set-6

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