Building Materials MCQs Set-7

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1. Shingle is

Crushed granite

Air weathered rock

Decomposed laterite

Water bound pebbles

2. Pick up the correct statement from the following:

All of these

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

Red short iron is of no value for welding purpose

Cupola furnace is used for the manufacture of cast iron

3. Spalling hammer is used for

Carving of stones

Rough dressing of stones

Driving wooden headed chisels

Breaking small projection of stones

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

20 to 30 %

5 to 10 %

50 to 60 %

70 to 80 %

5. Plywood is normally available

1 mm thick

2 to 3 mm thick

3 mm to 4 mm thick

2 mm thick

6. Which of the following represents a metamorphic rock?

(i) Slate

(ii) Shale

(iii) Quartzite

The correct answer is

Only (iii)

Both (i) and (iii)

Both (ii) and (iii)

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

7. Rapid hardening cement attains early strength due to

Lesser proportion of lime grounded finer than normal cement

Lesser proportion of lime grounded coarser than normal cement

Larger proportion of lime grounded finer than normal cement

Excess percentage of gypsum

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

12% moisture content

10% moisture content

8% moisture content

14% moisture content

9. 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 and, R is the correct explanation of A

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

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

6 hours

30 minutes

1 hour

10 hours

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

2.0 to 2.5

2.5 to 3.0

3.0 to 3.5

1.5 to 2.0

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

Stainless steel

High test plastic

Steel

Chromium plate

13. The stone suitable for rubble masonry should be.

Tough

Hard

Light

Heavy

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

Varnish

Water

Linseed oil

None of these

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

30

40

10

20

16. 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

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

All of these

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

17. Pick up the correct statement from the following:

All of these

Styrene resin is light in weight

Styrene resin is produced from ethylene which is made from petroleum

Styrene resin transmits ultraviolet waves of light

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

None of the above

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

19. Quick lime is

Calcium oxide

Calcium carbonate

Calcium hydroxide

None of the above

20. Pick up the correct statement from the following:

All the above

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

In open-hearth process, the furnace heats the steel

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21.

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

(iii) and (iv)

(i) and (ii)

(i) and (iv)

(ii) and (iii)

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

Lime stone

Shale

Gypsum

Sand stone

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

5 %

15 %

20 %

10 %

24. Lime putty

Can be used only upto three days

Is made by adding lime to water

All of these

Is made from hydraulic lime

25. In the method of condensation polymerization,

The reaction proceeds with an evolution of hydrogen chloride

Low-molecular substances are removed from the high molecular substance

The reaction proceeds with an evolution of ammonia

All of these

26. 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

90°

0°

30°

45°

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

Proportioning of aggregates

Fineness modulus

None of these

Grading of aggregates

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

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

In four quarters such that each board cuts annual rings at angles not less than 45°, is known as quarter sawing method

29. In a mortar, the binding material is

Sand

Surkhi (brick-dust)

Cinder

Cement

30. 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(iv)

(i) and (ii)

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

Annular rings

Medullary rays

Cambium layer

Heart wood

32. Resins are

Soluble in spirit

Not soluble in water

Used in varnishes

Left behind on evaporation of oil

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

30 minutes

50 minutes

75 minutes

90 minutes

34. Sand stone is

Igneous rock

Sedimentary rock

Metamorphic rock

Volcanic rock

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

First increases to a certain maximum value and then decreases

Decreases

First decreases to a certain minimum value and then increases

Increases

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

30 minutes

600 minutes

60 minutes

10 minutes

37. Quick lime is

(i) Slow in setting

(ii) Rapid in slacking

(iii) Good in strength

The correct answer is

Only (i)

Both (i) and (ii)

Both (ii) and (iii)

Only (ii)

38. 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

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

All of these

39. Good quality stones must

All the above

Be durable

Be free from clay

Resist action of acids

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

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

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

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

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

Building Materials MCQs Set-7

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Building Materials MCQs Set-7

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