Building Materials MCQs Set-7

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1. 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

2. Spalling hammer is used for

Carving of stones

Rough dressing of stones

Driving wooden headed chisels

Breaking small projection of stones

3. 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

All of these

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

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

Equal to the size of a fully burnt brick

Smaller than the size of a fully burnt brick

Greater than the size of a fully burnt brick

None of the above

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

Grading of aggregates

Fineness modulus

Proportioning of aggregates

None of these

6. Good quality stones must

Be free from clay

Resist action of acids

Be durable

All the above

7. 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

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

All of these

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

High test plastic

Chromium plate

Steel

Stainless steel

9. The stone suitable for rubble masonry should be.

Tough

Light

Hard

Heavy

10. Pick up the correct statement from the following:

Styrene resin is produced from ethylene which is made from petroleum

All of these

Styrene resin transmits ultraviolet waves of light

Styrene resin is light in weight

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11. 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)

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

50 minutes

90 minutes

75 minutes

30 minutes

13. 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

Excess percentage of gypsum

Lesser proportion of lime grounded coarser than normal cement

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

50 to 60 %

5 to 10 %

70 to 80 %

20 to 30 %

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

Decreases

First increases to a certain maximum value and then decreases

First decreases to a certain minimum value and then increases

Increases

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

20

10

40

30

17. Resins are

Soluble in spirit

Not soluble in water

Left behind on evaporation of oil

Used in varnishes

18. 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

(ii) and (iii)

(iii) and (iv)

(i)and(iv)

(i) and (ii)

19. Quick lime is

Calcium carbonate

Calcium hydroxide

None of the above

Calcium oxide

20.

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)

(iii) and (iv)

(ii) and (iii)

(i) and (iv)

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21. Sand stone is

Sedimentary rock

Volcanic rock

Metamorphic rock

Igneous rock

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

Medullary rays

Heart wood

Annular rings

Cambium layer

23. 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

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 sand stone with silicates resist a fire in a better way

All of these

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

25. Plywood is normally available

2 to 3 mm thick

1 mm thick

2 mm thick

3 mm to 4 mm thick

26. In the method of condensation polymerization,

All of these

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

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

None of these

Varnish

Linseed oil

Water

28. 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

0°

90°

45°

30°

29. Pick up the correct statement from the following:

Red short iron is of no value for welding purpose

All of these

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

30. 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

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

A is false but R is true

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31. Lime putty

Is made by adding lime to water

Is made from hydraulic lime

All of these

Can be used only upto three days

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

6 hours

30 minutes

1 hour

10 hours

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

20 %

5 %

10 %

15 %

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

Sand stone

Shale

Gypsum

Lime stone

35. 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%

36. Shingle is

Crushed granite

Decomposed laterite

Water bound pebbles

Air weathered rock

37. 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)

38. In a mortar, the binding material is

Cement

Sand

Cinder

Surkhi (brick-dust)

39. Pick up the correct statement from the following:

In basic Bessemer process, the steel heats the converter

All the above

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

40. 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

Building Materials MCQs Set-7

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