Building Materials MCQs Set-7

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

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

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

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

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

2. Rapid hardening cement attains early strength due to

Larger proportion of lime grounded finer than normal cement

Lesser proportion of lime grounded finer than normal cement

Lesser proportion of lime grounded coarser than normal cement

Excess percentage of gypsum

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

1 hour

30 minutes

10 hours

6 hours

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

None of these

Linseed oil

Varnish

Water

5. Pick up the correct statement from the following:

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

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

6. Pick up the correct statement from the following:

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

Cupola furnace is used for the manufacture of cast iron

All of these

Red short iron is of no value for welding purpose

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

20 to 30 %

50 to 60 %

5 to 10 %

70 to 80 %

8. Which of the following represents a metamorphic rock?

(i) Slate

(ii) Shale

(iii) Quartzite

The correct answer is

Only (iii)

Both (ii) and (iii)

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

Both (i) and (iii)

9. Spalling hammer is used for

Carving of stones

Driving wooden headed chisels

Rough dressing of stones

Breaking small projection of stones

10. Resins are

Not soluble in water

Used in varnishes

Soluble in spirit

Left behind on evaporation of oil

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

None of the above

Smaller than the size of a fully burnt brick

Greater than the size of a fully burnt brick

Equal to the size of a fully burnt brick

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

Fineness modulus

Grading of aggregates

Proportioning of aggregates

None of these

13. Quick lime is

Calcium carbonate

None of the above

Calcium hydroxide

Calcium oxide

14. Sand stone is

Metamorphic rock

Volcanic rock

Sedimentary rock

Igneous rock

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

Sand stone

Gypsum

Shale

Lime stone

16. Pick up the correct statement from the following:

Styrene resin is produced from ethylene which is made from petroleum

Styrene resin transmits ultraviolet waves of light

All of these

Styrene resin is light in weight

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

10 %

15 %

5 %

20 %

18. In a mortar, the binding material is

Cinder

Surkhi (brick-dust)

Sand

Cement

19. 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

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:

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

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

A is true but R is false

A is false but R is true

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21. Pick up the correct statement from the following:

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

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

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

All of these

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

Heart wood

Medullary rays

Cambium layer

Annular rings

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

90 minutes

50 minutes

30 minutes

75 minutes

24. Plywood is normally available

2 mm thick

2 to 3 mm thick

1 mm thick

3 mm to 4 mm thick

25. 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

(iii) and (iv)

(i) and (ii)

(ii) and (iii)

(i)and(iv)

26. In the method of condensation polymerization,

Low-molecular substances are removed from the high molecular substance

All of these

The reaction proceeds with an evolution of ammonia

The reaction proceeds with an evolution of hydrogen chloride

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

2.5 to 3.0

2.0 to 2.5

3.0 to 3.5

1.5 to 2.0

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

All of these

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

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

29.

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)

(i) and (iv)

(ii) and (iii)

(i) and (ii)

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

Increases

Decreases

First increases to a certain maximum value and then decreases

First decreases to a certain minimum value and then increases

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

Chromium plate

Stainless steel

High test plastic

Steel

32. Quick lime is

(i) Slow in setting

(ii) Rapid in slacking

(iii) Good in strength

The correct answer is

Only (i)

Only (ii)

Both (i) and (ii)

Both (ii) and (iii)

33. Lime putty

Is made from hydraulic lime

Can be used only upto three days

Is made by adding lime to water

All of these

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

30 minutes

600 minutes

60 minutes

10 minutes

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

40

20

10

30

36. The stone suitable for rubble masonry should be.

Hard

Tough

Heavy

Light

37. 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°

0°

30°

90°

38. Pick up the correct statement from the following:

In basic Bessemer process, the steel heats the converter

In open-hearth process, the furnace heats the steel

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

All the above

39. Good quality stones must

Be free from clay

Resist action of acids

All the above

Be durable

40. Shingle is

Air weathered rock

Crushed granite

Water bound pebbles

Decomposed laterite

Building Materials MCQs Set-7

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