Building Materials MCQs Set-7

June 11, 2021

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1. Shingle is

Water bound pebbles

Air weathered rock

Decomposed laterite

Crushed granite

2. 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)

3. 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

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 (iv)

(ii) and (iii)

(i) and (ii)

5. Plywood is normally available

3 mm to 4 mm thick

1 mm thick

2 mm thick

2 to 3 mm thick

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

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

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

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

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

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

12% moisture content

8% moisture content

10% moisture content

14% moisture content

8. Pick up the correct statement from the following:

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

Cupola furnace is used for the manufacture of cast iron

Red short iron is of no value for welding purpose

All of these

9. Good quality stones must

Be free from clay

Be durable

Resist action of acids

All the above

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

Linseed oil

None of these

Water

Varnish

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11. 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°

45°

30°

12. 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

13. Sand stone is

Metamorphic rock

Sedimentary rock

Igneous rock

Volcanic rock

14. Lime putty

Can be used only upto three days

Is made by adding lime to water

Is made from hydraulic lime

All of these

15. Spalling hammer is used for

Rough dressing of stones

Breaking small projection of stones

Driving wooden headed chisels

Carving of stones

16. The stone suitable for rubble masonry should be.

Hard

Light

Heavy

Tough

17. 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

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

18. Rapid hardening cement attains early strength due to

Larger proportion of lime grounded finer than normal cement

Excess percentage of gypsum

Lesser proportion of lime grounded finer than normal cement

Lesser proportion of lime grounded coarser than normal cement

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

20. Pick up the correct statement from the following:

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

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

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

None of these

Grading of aggregates

Proportioning of aggregates

Fineness modulus

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

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

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

All of these

23. 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

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

Heart wood

Annular rings

Medullary rays

Cambium layer

25. Resins are

Not soluble in water

Soluble in spirit

Used in varnishes

Left behind on evaporation of oil

26. Quick lime is

Calcium hydroxide

None of the above

Calcium oxide

Calcium carbonate

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

20 to 30 %

70 to 80 %

50 to 60 %

5 to 10 %

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

Stainless steel

High test plastic

Chromium plate

Steel

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

10 %

20 %

15 %

5 %

30. In a mortar, the binding material is

Cinder

Surkhi (brick-dust)

Cement

Sand

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

Gypsum

Sand stone

Lime stone

Shale

32. 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)

(iii) and (iv)

(ii) and (iii)

(i)and(iv)

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

60 minutes

10 minutes

600 minutes

30 minutes

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

75 minutes

50 minutes

90 minutes

30 minutes

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

Increases

First increases to a certain maximum value and then decreases

Decreases

First decreases to a certain minimum value and then increases

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

3.0 to 3.5

2.0 to 2.5

2.5 to 3.0

1.5 to 2.0

37. Quick lime is

(i) Slow in setting

(ii) Rapid in slacking

(iii) Good in strength

The correct answer is

Only (i)

Only (ii)

Both (i) and (ii)

Both (ii) and (iii)

38. 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

A is false but R is true

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

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

1 hour

30 minutes

6 hours

10 hours

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

Greater than the size of a fully burnt brick

Equal to the size of a fully burnt brick

Smaller than the size of a fully burnt brick

None of the above

Building Materials MCQs Set-7

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