Building Materials MCQs Set-7

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1. 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°

45°

30°

0°

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

Cupola furnace is used for the manufacture of cast iron

Red short iron is of no value for welding purpose

3. 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

4. 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

All of these

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

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

Varnish

Linseed oil

None of these

Water

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

90 minutes

75 minutes

50 minutes

30 minutes

7. 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 (i) and (iii)

Both (ii) and (iii)

8. 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

9. In the method of condensation polymerization,

The reaction proceeds with an evolution of hydrogen chloride

The reaction proceeds with an evolution of ammonia

All of these

Low-molecular substances are removed from the high molecular substance

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

Steel

Stainless steel

High test plastic

Chromium plate

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

First increases to a certain maximum value and then decreases

First decreases to a certain minimum value and then increases

Increases

Decreases

12. 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)

Both (i) and (ii)

Only (i)

13. 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%

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

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

14. Good quality stones must

Be free from clay

All the above

Resist action of acids

Be durable

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

Sand stone

Gypsum

Lime stone

Shale

16. Shingle is

Water bound pebbles

Crushed granite

Decomposed laterite

Air weathered rock

17. Lime putty

Is made by adding lime to water

Is made from hydraulic lime

All of these

Can be used only upto three days

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

20

40

30

10

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

20 to 30 %

5 to 10 %

70 to 80 %

50 to 60 %

20. Pick up the correct statement from the following:

In open-hearth process, the furnace heats the steel

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

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21. Plywood is normally available

1 mm thick

2 to 3 mm thick

2 mm thick

3 mm to 4 mm thick

22. Sand stone is

Sedimentary rock

Igneous rock

Volcanic rock

Metamorphic rock

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

Medullary rays

Cambium layer

Heart wood

Annular rings

24. Pick up the correct statement from the following:

Styrene resin transmits ultraviolet waves of light

Styrene resin is produced from ethylene which is made from petroleum

All of these

Styrene resin is light in weight

25. 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

26. 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)

(i)and(iv)

(ii) and (iii)

(i) and (ii)

27.

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)

(ii) and (iii)

(i) and (iv)

28. Resins are

Soluble in spirit

Used in varnishes

Not soluble in water

Left behind on evaporation of oil

29. 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

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

All of these

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

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

Grading of aggregates

Proportioning of aggregates

None of these

Fineness modulus

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31. 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

32. In a mortar, the binding material is

Sand

Surkhi (brick-dust)

Cement

Cinder

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

15 %

20 %

5 %

10 %

34. The stone suitable for rubble masonry should be.

Tough

Light

Hard

Heavy

35. 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

36. Spalling hammer is used for

Rough dressing of stones

Carving of stones

Breaking small projection of stones

Driving wooden headed chisels

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

10 minutes

600 minutes

60 minutes

30 minutes

38. Quick lime is

Calcium oxide

Calcium hydroxide

Calcium carbonate

None of the above

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

6 hours

30 minutes

10 hours

1 hour

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

2.5 to 3.0

2.0 to 2.5

1.5 to 2.0

3.0 to 3.5

Building Materials MCQs Set-7

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