Building Materials MCQs Set-7

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1. 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

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

2. Quick lime is

Calcium hydroxide

Calcium carbonate

Calcium oxide

None of the above

3.

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

(i) and (ii)

(iii) and (iv)

(ii) and (iii)

(i) and (iv)

4. Shingle is

Water bound pebbles

Crushed granite

Decomposed laterite

Air weathered rock

5. Pick up the correct statement from the following:

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

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

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

5 %

20 %

10 %

15 %

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

600 minutes

10 minutes

30 minutes

60 minutes

8. Lime putty

All of these

Can be used only upto three days

Is made from hydraulic lime

Is made by adding lime to water

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

6 hours

1 hour

30 minutes

10 hours

10. 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

Excess percentage of gypsum

Larger proportion of lime grounded finer than normal cement

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11. Sand stone is

Sedimentary rock

Igneous rock

Volcanic rock

Metamorphic rock

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

Water

None of these

Varnish

Linseed oil

13. Resins are

Left behind on evaporation of oil

Not soluble in water

Soluble in spirit

Used in varnishes

14. Spalling hammer is used for

Carving of stones

Rough dressing of stones

Driving wooden headed chisels

Breaking small projection of stones

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

Annular rings

Cambium layer

Heart wood

Medullary rays

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

Lime stone

Gypsum

Sand stone

Shale

17. Pick up the correct statement from the following:

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

All the above

In basic Bessemer process, the steel heats the converter

18. 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 (ii)

(ii) and (iii)

(i)and(iv)

19. In the method of condensation polymerization,

The reaction proceeds with an evolution of hydrogen chloride

All of these

The reaction proceeds with an evolution of ammonia

Low-molecular substances are removed from the high molecular substance

20. Which of the following represents a metamorphic rock?

(i) Slate

(ii) Shale

(iii) Quartzite

The correct answer is

Only (iii)

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

Both (ii) and (iii)

Both (i) and (iii)

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

Increases

First increases to a certain maximum value and then decreases

First decreases to a certain minimum value and then increases

Decreases

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

14% moisture content

12% moisture content

8% moisture content

10% moisture content

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

3.0 to 3.5

2.5 to 3.0

1.5 to 2.0

2.0 to 2.5

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

20

10

40

30

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

Greater than the size of a fully burnt brick

None of the above

Equal to the size of a fully burnt brick

Smaller than the size of a fully burnt brick

26. Pick up the correct statement from the following:

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

Cupola furnace is used for the manufacture of cast iron

27. Quick lime is

(i) Slow in setting

(ii) Rapid in slacking

(iii) Good in strength

The correct answer is

Only (ii)

Both (ii) and (iii)

Only (i)

Both (i) and (ii)

28. Good quality stones must

Resist action of acids

All the above

Be durable

Be free from clay

29. 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°

0°

90°

30. 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 63% ; silica 22% ; other ingredients 15%

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

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31. 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

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

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

32. Plywood is normally available

2 mm thick

1 mm thick

3 mm to 4 mm thick

2 to 3 mm thick

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

75 minutes

90 minutes

50 minutes

30 minutes

34. The stone suitable for rubble masonry should be.

Heavy

Tough

Light

Hard

35. 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

36. Pick up the correct statement from the following:

All of these

Styrene resin is produced from ethylene which is made from petroleum

Styrene resin is light in weight

Styrene resin transmits ultraviolet waves of light

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

5 to 10 %

20 to 30 %

70 to 80 %

50 to 60 %

38. In a mortar, the binding material is

Cement

Cinder

Sand

Surkhi (brick-dust)

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

Steel

High test plastic

Stainless steel

Chromium plate

40. 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

A is false but R is true

Both A and R is true and, R is the correct explanation of A

Building Materials MCQs Set-7

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