Building Materials MCQs Set-7

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1. 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

Lesser proportion of lime grounded finer than normal cement

Excess percentage of gypsum

2. In the method of condensation polymerization,

The reaction proceeds with an evolution of hydrogen chloride

All of these

Low-molecular substances are removed from the high molecular substance

The reaction proceeds with an evolution of ammonia

3. Spalling hammer is used for

Rough dressing of stones

Breaking small projection of stones

Driving wooden headed chisels

Carving of stones

4. Lime putty

Can be used only upto three days

Is made from hydraulic lime

Is made by adding lime to water

All of these

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

30 minutes

10 minutes

600 minutes

60 minutes

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

Lime stone

Gypsum

Sand stone

Shale

7. Pick up the correct statement from the following:

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

All of these

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

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

8. The stone suitable for rubble masonry should be.

Heavy

Light

Tough

Hard

9. Pick up the correct statement from the following:

Styrene resin is produced from ethylene which is made from petroleum

Styrene resin is light in weight

All of these

Styrene resin transmits ultraviolet waves of light

10. Pick up the correct statement from the following:

All the above

In open-hearth process, the furnace heats the steel

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

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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

30°

45°

0°

90°

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

1.5 to 2.0

2.0 to 2.5

2.5 to 3.0

3.0 to 3.5

13. 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 (ii)

(i)and(iv)

(ii) and (iii)

(iii) and (iv)

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

75 minutes

30 minutes

50 minutes

90 minutes

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

50 to 60 %

70 to 80 %

20 to 30 %

5 to 10 %

16. Quick lime is

(i) Slow in setting

(ii) Rapid in slacking

(iii) Good in strength

The correct answer is

Only (i)

Both (ii) and (iii)

Both (i) and (ii)

Only (ii)

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

None of these

Grading of aggregates

Fineness modulus

Proportioning of aggregates

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

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

All of these

Tangentially to annual rings, is known as tangential method

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

19. Good quality stones must

Be free from clay

Resist action of acids

All the above

Be durable

20. Pick up the correct statement from the following:

All of these

Cupola furnace is used for the manufacture of cast iron

Red short iron is of no value for welding purpose

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

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21. Resins are

Soluble in spirit

Not soluble in water

Left behind on evaporation of oil

Used in varnishes

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

Greater than the size of a fully burnt brick

None of the above

Smaller than the size of a fully burnt brick

Equal to the size of a fully burnt brick

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

1 hour

10 hours

30 minutes

6 hours

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

30

40

20

10

25. 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

A is true but R is false

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

A is false but R is true

26. 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

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

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

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

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

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

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

5 %

15 %

10 %

20 %

29. Plywood is normally available

2 to 3 mm thick

2 mm thick

1 mm thick

3 mm to 4 mm thick

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

Decreases

First increases to a certain maximum value and then decreases

Increases

First decreases to a certain minimum value and then increases

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31. Shingle is

Water bound pebbles

Air weathered rock

Crushed granite

Decomposed laterite

32. In a mortar, the binding material is

Cement

Cinder

Sand

Surkhi (brick-dust)

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

Heart wood

Annular rings

Medullary rays

Cambium layer

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

None of these

Linseed oil

Varnish

Water

35. Quick lime is

Calcium hydroxide

None of the above

Calcium carbonate

Calcium oxide

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

8% moisture content

14% moisture content

12% moisture content

10% moisture content

37. Which of the following represents a metamorphic rock?

(i) Slate

(ii) Shale

(iii) Quartzite

The correct answer is

Both (i) and (iii)

Both (ii) and (iii)

Only (iii)

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

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

Steel

High test plastic

Chromium plate

Stainless steel

39.

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

(i) and (ii)

(i) and (iv)

(ii) and (iii)

(iii) and (iv)

40. Sand stone is

Volcanic rock

Sedimentary rock

Igneous rock

Metamorphic rock

Building Materials MCQs Set-7

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