Building Materials MCQs Set-7

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1. Which of the following represents a metamorphic rock?

(i) Slate

(ii) Shale

(iii) Quartzite

The correct answer is

All (i), (ii) and (iii)

Both (ii) and (iii)

Only (iii)

Both (i) and (iii)

2. With increase in moisture content, the bulking of sand

First increases to a certain maximum value and then decreases

First decreases to a certain minimum value and then increases

Decreases

Increases

3. Spalling hammer is used for

Breaking small projection of stones

Carving of stones

Rough dressing of stones

Driving wooden headed chisels

4. Good quality stones must

Resist action of acids

All the above

Be durable

Be free from clay

5. Initial setting time of cement for asbestos cement products should be not less than

50 minutes

75 minutes

30 minutes

90 minutes

6.

Proper amount of entrained air in concrete results in

(i) Better workability (ii) Better resistance to freezing and thawing (iii) Lesser workability (iv) Less resistance to freezing and thawing The correct answer is

(iii) and (iv)

(ii) and (iii)

(i) and (iv)

(i) and (ii)

7. Pick up the correct statement from the following:

The free quartz suddenly expands at a temperature lower than 600°C

The lime stone resists fire upto about 800°C and at higher temperature it splits into CaO and CO2

All of these

The sand stone with silicates resist a fire in a better way

8. The stone suitable for rubble masonry should be.

Tough

Hard

Light

Heavy

9. For the manufacture of Portland cement, the proportions of raw materials used, are

Silica 70% ; lime 20% ; other ingredients 10%

Silica 40% ; lime 40% ; other ingredients 20%

Lime 63% ; silica 22% ; other ingredients 15%

Lime 22% ; silica 63% ; other ingredients 15%

10. The vehicle used in case of enamel paints is usually

Linseed oil

Water

Varnish

None of these

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11. Plywood is made by bonding together thin layers of wood in such a way that the angle between grains of any layer to grains of adjacent layers is

45°

90°

30°

0°

12. According to IS 399-1963, the weight of the timber is specified at

8% moisture content

14% moisture content

10% moisture content

12% moisture content

13. Plywood is normally available

3 mm to 4 mm thick

2 to 3 mm thick

2 mm thick

1 mm thick

14. In the method of condensation polymerization,

The reaction proceeds with an evolution of hydrogen chloride

The reaction proceeds with an evolution of ammonia

Low-molecular substances are removed from the high molecular substance

All of these

15. Which of the following sedimentary rocks changes into quartzite by metamorphic action?

Lime stone

Sand stone

Shale

Gypsum

16. Pick up the correct statement from the following:

Styrene resin is light in weight

Styrene resin is produced from ethylene which is made from petroleum

All of these

Styrene resin transmits ultraviolet waves of light

17. Pick up the correct statement from the following:

Pollark, an Austrian scientist prepared a substance from urea and formaldehyde and called it Plastic

All of these

Alexander Parkes, a Scottish chemist prepared a hard material by mixing camphor and alcohol with nitro cellulose and called it, as Parkesite

Dr. L. Bakeland, a Belgian scientist prepared a product known as Bakelite

18. The internal size of mould used in brick preparation is

None of the above

Smaller than the size of a fully burnt brick

Equal to the size of a fully burnt brick

Greater than the size of a fully burnt brick

19. Lime putty

Is made by adding lime to water

All of these

Can be used only upto three days

Is made from hydraulic lime

20. Assertion A : Paints with white lead base are not recommended for painting of iron works.

Reason R : Paints with white lead base do not check rusting of iron.

Select your answer according to the coding system given below:

A is true but R is false

A is false but R is true

Both A and R is true and, R is the correct explanation of A

Both A and R is true but R is not the correct explanation of A

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21. The slenderness ratio for masonry walls should not be more than

10

30

20

40

22. The initial setting time for ordinary Portland cement as per IS specifications should not be less than

600 minutes

10 minutes

60 minutes

30 minutes

23. Pick up the correct statement from the following:

Cupola furnace is used for the manufacture of cast iron

Air bubbles in casting produce a dull sound by tapping their surfaces lightly with a hammer

Red short iron is of no value for welding purpose

All of these

24. A good building stone should not absorb water more than

5 %

15 %

10 %

20 %

25. Quick lime is

None of the above

Calcium carbonate

Calcium oxide

Calcium hydroxide

26. Quick lime is

(i) Slow in setting

(ii) Rapid in slacking

(iii) Good in strength

The correct answer is

Both (i) and (ii)

Both (ii) and (iii)

Only (i)

Only (ii)

27. Shingle is

Crushed granite

Air weathered rock

Decomposed laterite

Water bound pebbles

28. Pick up the correct statement from the following:

All the above

In basic Bessemer process, the steel heats the converter

In Siemens process, the impurities of pig iron are oxidized by the oxygen of the ore

In open-hearth process, the furnace heats the steel

29. Compared to mild steel, cast iron has

(i) High compressive strength

(ii) High tensile strength

(iii) Low compressive strength

(iv) Low tensile strength

The correct answer is

(i)and(iv)

(iii) and (iv)

(i) and (ii)

(ii) and (iii)

30. Sand stone is

Sedimentary rock

Volcanic rock

Igneous rock

Metamorphic rock

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31. Rapid hardening cement attains early strength due to

Lesser proportion of lime grounded coarser than normal cement

Larger proportion of lime grounded finer than normal cement

Excess percentage of gypsum

Lesser proportion of lime grounded finer than normal cement

32. The age of a tree can be known by examining

Cambium layer

Medullary rays

Annular rings

Heart wood

33. As per IS specifications, the maximum final setting time for ordinary Portland cement should be

1 hour

30 minutes

10 hours

6 hours

34. In a mortar, the binding material is

Cinder

Cement

Surkhi (brick-dust)

Sand

35. Index number expressing the relative sizes of both coarse and fine aggregates, is called

Proportioning of aggregates

None of these

Fineness modulus

Grading of aggregates

36. Specific gravity for most of the building stones lies between

1.5 to 2.0

2.0 to 2.5

3.0 to 3.5

2.5 to 3.0

37. Bullet proof glass is made of thick glass sheet sandwiched by a layer of

High test plastic

Stainless steel

Chromium plate

Steel

38. Resins are

Used in varnishes

Left behind on evaporation of oil

Soluble in spirit

Not soluble in water

39. Pick up the correct statement from the following: Method of sawing timber

In four quarters such that each board cuts annual rings at angles not less than 45°, is known as quarter sawing method

Tangentially to annual rings, is known as tangential method

Cut out of quarter logs, parallel to the medullary rays and perpendicular to annual rings, is known as radial sawing

All of these

40. Percentage of silica in a good brick earth lies between

50 to 60 %

20 to 30 %

5 to 10 %

70 to 80 %

Building Materials MCQs Set-7

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