Building Materials MCQs Set-7

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1. Quick lime is

None of the above

Calcium oxide

Calcium hydroxide

Calcium carbonate

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

12% moisture content

14% moisture content

10% moisture content

8% moisture content

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

Medullary rays

Cambium layer

Heart wood

Annular rings

4. Spalling hammer is used for

Breaking small projection of stones

Rough dressing of stones

Carving of stones

Driving wooden headed chisels

5. Sand stone is

Metamorphic rock

Igneous rock

Volcanic rock

Sedimentary rock

6. Pick up the correct statement from the following:

All the above

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

In basic Bessemer process, the steel heats the converter

In open-hearth process, the furnace heats the steel

7. 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°

0°

30°

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

Decreases

First decreases to a certain minimum value and then increases

First increases to a certain maximum value and then decreases

Increases

9. Rapid hardening cement attains early strength due to

Excess percentage of gypsum

Larger proportion of lime grounded finer than normal cement

Lesser proportion of lime grounded coarser than normal cement

Lesser proportion of lime grounded finer than normal cement

10. Plywood is normally available

2 to 3 mm thick

3 mm to 4 mm thick

2 mm thick

1 mm thick

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

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

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

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

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

12. 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)

13. Pick up the correct statement from the following:

All of these

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

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

14. In the method of condensation polymerization,

The reaction proceeds with an evolution of hydrogen chloride

The reaction proceeds with an evolution of ammonia

All of these

Low-molecular substances are removed from the high molecular substance

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

10 minutes

30 minutes

60 minutes

600 minutes

16. 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

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

All of these

17. Shingle is

Decomposed laterite

Crushed granite

Air weathered rock

Water bound pebbles

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

10 hours

6 hours

1 hour

30 minutes

19. Good quality stones must

All the above

Be durable

Resist action of acids

Be free from clay

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

Water

Linseed oil

Varnish

None of these

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

40

10

20

30

22. Lime putty

Is made by adding lime to water

Is made from hydraulic lime

All of these

Can be used only upto three days

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

20 to 30 %

70 to 80 %

5 to 10 %

50 to 60 %

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

5 %

15 %

10 %

20 %

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

90 minutes

50 minutes

75 minutes

30 minutes

26. 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

Styrene resin is light in weight

All of these

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

Sand stone

Lime stone

Shale

Gypsum

28. Quick lime is

(i) Slow in setting

(ii) Rapid in slacking

(iii) Good in strength

The correct answer is

Only (ii)

Both (i) and (ii)

Only (i)

Both (ii) and (iii)

29. Pick up the correct statement from the following:

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

All of these

30. The stone suitable for rubble masonry should be.

Light

Tough

Heavy

Hard

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31. Pick up the correct statement from the following:

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

All of these

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

32. 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

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

A is false but R is true

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

33.

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

(ii) and (iii)

(iii) and (iv)

(i) and (iv)

(i) and (ii)

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

3.0 to 3.5

2.0 to 2.5

1.5 to 2.0

2.5 to 3.0

35. 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)

(ii) and (iii)

(i) and (ii)

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

None of these

Fineness modulus

Grading of aggregates

Proportioning of aggregates

37. Resins are

Not soluble in water

Left behind on evaporation of oil

Used in varnishes

Soluble in spirit

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

Stainless steel

High test plastic

Steel

Chromium plate

39. In a mortar, the binding material is

Cement

Surkhi (brick-dust)

Cinder

Sand

40. 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

Building Materials MCQs Set-7

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