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

12% moisture content

10% moisture content

2. Plywood is normally available

2 to 3 mm thick

3 mm to 4 mm thick

2 mm thick

1 mm thick

3. 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

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

50 minutes

75 minutes

30 minutes

90 minutes

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

First increases to a certain maximum value and then decreases

Increases

First decreases to a certain minimum value and then increases

Decreases

6. Pick up the correct statement from the following:

Styrene resin is light in weight

All of these

Styrene resin transmits ultraviolet waves of light

Styrene resin is produced from ethylene which is made from petroleum

7. Sand stone is

Metamorphic rock

Sedimentary rock

Igneous rock

Volcanic rock

8. Quick lime is

(i) Slow in setting

(ii) Rapid in slacking

(iii) Good in strength

The correct answer is

Only (i)

Only (ii)

Both (ii) and (iii)

Both (i) and (ii)

9. Good quality stones must

All the above

Be free from clay

Resist action of acids

Be durable

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

None of these

Proportioning of aggregates

Fineness modulus

Grading of aggregates

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11. The stone suitable for rubble masonry should be.

Heavy

Light

Hard

Tough

12. Pick up the correct statement from the following:

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

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

13. Which of the following represents a metamorphic rock?

(i) Slate

(ii) Shale

(iii) Quartzite

The correct answer is

Only (iii)

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

Both (ii) and (iii)

Both (i) and (iii)

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

70 to 80 %

5 to 10 %

20 to 30 %

50 to 60 %

15. Rapid hardening cement attains early strength due to

Lesser proportion of lime grounded coarser than normal cement

Lesser proportion of lime grounded finer than normal cement

Larger proportion of lime grounded finer than normal cement

Excess percentage of gypsum

16. Resins are

Not soluble in water

Left behind on evaporation of oil

Used in varnishes

Soluble in spirit

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

Sand stone

Gypsum

Shale

Lime stone

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

Medullary rays

Annular rings

Cambium layer

Heart wood

19.

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)

(iii) and (iv)

(ii) and (iii)

20. In a mortar, the binding material is

Cement

Surkhi (brick-dust)

Cinder

Sand

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

1.5 to 2.0

2.5 to 3.0

3.0 to 3.5

2.0 to 2.5

22. 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

All of these

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

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

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

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

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

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

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

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

15 %

20 %

5 %

10 %

25. Pick up the correct statement from the following:

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

All the above

26. 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

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

Linseed oil

Water

None of these

Varnish

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

Smaller than the size of a fully burnt brick

Greater than the size of a fully burnt brick

None of the above

Equal to the size of a fully burnt brick

29. 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)

(ii) and (iii)

(iii) and (iv)

(i)and(iv)

30. 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°

90°

30°

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

10 hours

30 minutes

1 hour

6 hours

32. Quick lime is

Calcium hydroxide

None of the above

Calcium oxide

Calcium carbonate

33. In the method of condensation polymerization,

The reaction proceeds with an evolution of ammonia

The reaction proceeds with an evolution of hydrogen chloride

Low-molecular substances are removed from the high molecular substance

All of these

34. Lime putty

All of these

Can be used only upto three days

Is made by adding lime to water

Is made from hydraulic lime

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

10 minutes

600 minutes

30 minutes

60 minutes

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

High test plastic

Steel

Stainless steel

Chromium plate

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

30

40

10

20

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

All of these

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

39. Shingle is

Crushed granite

Air weathered rock

Decomposed laterite

Water bound pebbles

40. Spalling hammer is used for

Rough dressing of stones

Carving of stones

Breaking small projection of stones

Driving wooden headed chisels

Building Materials MCQs Set-7

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