Building Materials MCQs Set-7

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

5 to 10 %

70 to 80 %

20 to 30 %

50 to 60 %

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

30

20

10

40

3. 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

4. Lime putty

All of these

Can be used only upto three days

Is made by adding lime to water

Is made from hydraulic lime

5. 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)

(i)and(iv)

(iii) and (iv)

6. 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 false but R is true

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

7. Plywood is normally available

2 to 3 mm thick

3 mm to 4 mm thick

1 mm thick

2 mm thick

8. 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

9. 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

10. Rapid hardening cement attains early strength due to

Lesser proportion of lime grounded coarser than normal cement

Excess percentage of gypsum

Lesser proportion of lime grounded finer than normal cement

Larger proportion of lime grounded finer than normal cement

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11. Quick lime is

(i) Slow in setting

(ii) Rapid in slacking

(iii) Good in strength

The correct answer is

Both (ii) and (iii)

Only (ii)

Only (i)

Both (i) and (ii)

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

(ii) and (iii)

(iii) and (iv)

(i) and (ii)

(i) and (iv)

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

10% moisture content

8% moisture content

12% moisture content

14% moisture content

14. Quick lime is

Calcium hydroxide

Calcium oxide

Calcium carbonate

None of the above

15. The stone suitable for rubble masonry should be.

Hard

Heavy

Tough

Light

16. Spalling hammer is used for

Rough dressing of stones

Driving wooden headed chisels

Carving of stones

Breaking small projection of stones

17. Shingle is

Water bound pebbles

Air weathered rock

Crushed granite

Decomposed laterite

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

2.5 to 3.0

1.5 to 2.0

3.0 to 3.5

2.0 to 2.5

19. Sand stone is

Volcanic rock

Sedimentary rock

Igneous rock

Metamorphic rock

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

First decreases to a certain minimum value and then increases

Decreases

First increases to a certain maximum value and then decreases

Increases

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21. Good quality stones must

All the above

Be durable

Be free from clay

Resist action of acids

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

Linseed oil

None of these

Water

Varnish

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

30 minutes

1 hour

6 hours

10 hours

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

Gypsum

Lime stone

Shale

Sand stone

25. Which of the following represents a metamorphic rock?

(i) Slate

(ii) Shale

(iii) Quartzite

The correct answer is

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

Both (i) and (iii)

Both (ii) and (iii)

Only (iii)

26. Pick up the correct statement from the following:

Cupola furnace is used for the manufacture of cast iron

All of these

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

27. 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

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

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

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

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

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

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

10 %

20 %

15 %

5 %

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

Smaller than the size of a fully burnt brick

Equal to the size of a fully burnt brick

Greater than the size of a fully burnt brick

None of the above

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

Chromium plate

High test plastic

Steel

Stainless steel

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

30 minutes

10 minutes

60 minutes

600 minutes

33. Resins are

Soluble in spirit

Left behind on evaporation of oil

Not soluble in water

Used in varnishes

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

Heart wood

Cambium layer

Annular rings

Medullary rays

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

30 minutes

90 minutes

75 minutes

50 minutes

36. Pick up the correct statement from the following:

Dr. L. Bakeland, a Belgian scientist prepared a product known as Bakelite

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

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

37. 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

38. 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°

90°

0°

39. In a mortar, the binding material is

Cinder

Sand

Surkhi (brick-dust)

Cement

40. Pick up the correct statement from the following:

Styrene resin is light in weight

All of these

Styrene resin is produced from ethylene which is made from petroleum

Styrene resin transmits ultraviolet waves of light

Building Materials MCQs Set-7

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Building Materials MCQs Set-7

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