Building Materials MCQs Set-7

June 11, 2021

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1. 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

2. Plywood is normally available

1 mm thick

2 mm thick

3 mm to 4 mm thick

2 to 3 mm thick

3. Good quality stones must

Resist action of acids

Be free from clay

Be durable

All the above

4. 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°

90°

0°

30°

5. Shingle is

Decomposed laterite

Air weathered rock

Water bound pebbles

Crushed granite

6. 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

None of the above

Greater than the size of a fully burnt brick

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

1.5 to 2.0

2.0 to 2.5

2.5 to 3.0

3.0 to 3.5

8. In a mortar, the binding material is

Cinder

Surkhi (brick-dust)

Sand

Cement

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

Tangentially to annual rings, is known as tangential method

All of these

Cut out of quarter logs, parallel to the medullary rays and perpendicular to annual rings, is known as radial sawing

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

Linseed oil

Water

Varnish

None of these

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

10% moisture content

14% moisture content

12% moisture content

8% moisture content

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

Cambium layer

Medullary rays

Heart wood

Annular rings

13. Quick lime is

Calcium hydroxide

None of the above

Calcium carbonate

Calcium oxide

14. 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)

(i) and (ii)

(i)and(iv)

(iii) and (iv)

15. 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 and, R is the correct explanation of A

A is false but R is true

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

A is true but R is false

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

20 to 30 %

70 to 80 %

50 to 60 %

5 to 10 %

17.

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)

(ii) and (iii)

(i) and (iv)

(i) and (ii)

18. Lime putty

Can be used only upto three days

Is made from hydraulic lime

All of these

Is made by adding lime to water

19. Pick up the correct statement from the following:

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

All of these

Red short iron is of no value for welding purpose

Cupola furnace is used for the manufacture of cast iron

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

6 hours

1 hour

30 minutes

10 hours

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21. Resins are

Not soluble in water

Used in varnishes

Left behind on evaporation of oil

Soluble in spirit

22. Which of the following represents a metamorphic rock?

(i) Slate

(ii) Shale

(iii) Quartzite

The correct answer is

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

Only (iii)

Both (ii) and (iii)

Both (i) and (iii)

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

Grading of aggregates

None of these

Proportioning of aggregates

Fineness modulus

24. Pick up the correct statement from the following:

Styrene resin transmits ultraviolet waves of light

All of these

Styrene resin is produced from ethylene which is made from petroleum

Styrene resin is light in weight

25. In the method of condensation polymerization,

Low-molecular substances are removed from the high molecular substance

All of these

The reaction proceeds with an evolution of hydrogen chloride

The reaction proceeds with an evolution of ammonia

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

Decreases

Increases

First increases to a certain maximum value and then decreases

First decreases to a certain minimum value and then increases

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

60 minutes

30 minutes

10 minutes

600 minutes

28. The stone suitable for rubble masonry should be.

Light

Tough

Heavy

Hard

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

Chromium plate

Stainless steel

Steel

High test plastic

30. Pick up the correct statement from the following:

All of these

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

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

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

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

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

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

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

32. 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

33. Spalling hammer is used for

Driving wooden headed chisels

Carving of stones

Breaking small projection of stones

Rough dressing of stones

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

75 minutes

30 minutes

50 minutes

90 minutes

35. Sand stone is

Volcanic rock

Sedimentary rock

Metamorphic rock

Igneous rock

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

37. Quick lime is

(i) Slow in setting

(ii) Rapid in slacking

(iii) Good in strength

The correct answer is

Both (ii) and (iii)

Both (i) and (ii)

Only (i)

Only (ii)

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

Gypsum

Sand stone

Lime stone

Shale

39. Pick up the correct statement from the following:

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

The lime stone resists fire upto about 800°C and at higher temperature it splits into CaO and CO2

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

10 %

5 %

20 %

15 %

Building Materials MCQs Set-7

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