Building Materials MCQs Set-7

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1. 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 and, R is the correct explanation of A

A is true but R is false

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

A is false but R is true

2. Resins are

Not soluble in water

Left behind on evaporation of oil

Soluble in spirit

Used in varnishes

3. Lime putty

Can be used only upto three days

Is made by adding lime to water

Is made from hydraulic lime

All of these

4. 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

Styrene resin transmits ultraviolet waves of light

All of these

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

Fineness modulus

None of these

Grading of aggregates

Proportioning of aggregates

6. In a mortar, the binding material is

Sand

Cinder

Cement

Surkhi (brick-dust)

7. Which of the following represents a metamorphic rock?

(i) Slate

(ii) Shale

(iii) Quartzite

The correct answer is

Only (iii)

Both (i) and (iii)

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

Both (ii) and (iii)

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

Decreases

First decreases to a certain minimum value and then increases

Increases

First increases to a certain maximum value and then decreases

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

50 minutes

30 minutes

90 minutes

75 minutes

10. Plywood is normally available

2 mm thick

3 mm to 4 mm thick

1 mm thick

2 to 3 mm thick

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11. Pick up the correct statement from the following:

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

All the above

In open-hearth process, the furnace heats the steel

In basic Bessemer process, the steel heats the converter

12.

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 (iv)

(i) and (ii)

(ii) and (iii)

(iii) and (iv)

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

Chromium plate

High test plastic

Stainless steel

Steel

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

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

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

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

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

15. Rapid hardening cement attains early strength due to

Excess percentage of gypsum

Lesser proportion of lime grounded finer than normal cement

Larger proportion of lime grounded finer than normal cement

Lesser proportion of lime grounded coarser than normal cement

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

Equal to the size of a fully burnt brick

None of the above

Smaller than the size of a fully burnt brick

Greater than the size of a fully burnt brick

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

30

20

10

40

18. 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°

0°

45°

90°

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

15 %

10 %

20 %

5 %

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

20 to 30 %

70 to 80 %

50 to 60 %

5 to 10 %

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21. Quick lime is

Calcium hydroxide

Calcium carbonate

Calcium oxide

None of the above

22. Shingle is

Decomposed laterite

Water bound pebbles

Air weathered rock

Crushed granite

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

Linseed oil

Water

Varnish

None of these

24. 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 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

25. Quick lime is

(i) Slow in setting

(ii) Rapid in slacking

(iii) Good in strength

The correct answer is

Both (ii) and (iii)

Only (i)

Both (i) and (ii)

Only (ii)

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

14% moisture content

12% moisture content

10% moisture content

8% moisture content

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

2.5 to 3.0

2.0 to 2.5

1.5 to 2.0

3.0 to 3.5

28. Good quality stones must

Be free from clay

Resist action of acids

Be durable

All the above

29. In the method of condensation polymerization,

The reaction proceeds with an evolution of ammonia

The reaction proceeds with an evolution of hydrogen chloride

All of these

Low-molecular substances are removed from the high molecular substance

30. Sand stone is

Volcanic rock

Metamorphic rock

Igneous rock

Sedimentary rock

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

30 minutes

60 minutes

600 minutes

10 minutes

32. Spalling hammer is used for

Breaking small projection of stones

Carving of stones

Driving wooden headed chisels

Rough dressing of stones

33. 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

All of these

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

Tangentially to annual rings, is known as tangential method

34. The stone suitable for rubble masonry should be.

Heavy

Hard

Light

Tough

35. Pick up the correct statement from the following:

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

All of these

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

36. Pick up the correct statement from the following:

Red short iron is of no value for welding purpose

Cupola furnace is used for the manufacture of cast iron

All of these

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

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

Lime stone

Sand stone

Gypsum

Shale

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

6 hours

30 minutes

10 hours

1 hour

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

Annular rings

Cambium layer

Medullary rays

Heart wood

40. 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)

(ii) and (iii)

(i) and (ii)

(i)and(iv)

Building Materials MCQs Set-7

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