Building Materials MCQs Set-7

Page 1 of 4

1. Pick up the correct statement from the following:

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

Alexander Parkes, a Scottish chemist prepared a hard material by mixing camphor and alcohol with nitro cellulose and called it, as Parkesite

All of these

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

2.0 to 2.5

1.5 to 2.0

2.5 to 3.0

3.0 to 3.5

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

70 to 80 %

50 to 60 %

20 to 30 %

5 to 10 %

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

Fineness modulus

None of these

Grading of aggregates

Proportioning of aggregates

5. Lime putty

All of these

Is made from hydraulic lime

Is made by adding lime to water

Can be used only upto three days

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

30 minutes

75 minutes

50 minutes

90 minutes

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

20 %

10 %

15 %

5 %

8.

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)

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

Annular rings

Heart wood

Cambium layer

Medullary rays

10. In the method of condensation polymerization,

All of these

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

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11. Sand stone is

Igneous rock

Sedimentary rock

Volcanic rock

Metamorphic rock

12. Pick up the correct statement from the following:

Styrene resin is light in weight

Styrene resin is produced from ethylene which is made from petroleum

Styrene resin transmits ultraviolet waves of light

All of these

13. 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

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

14. Resins are

Left behind on evaporation of oil

Not soluble in water

Used in varnishes

Soluble in spirit

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

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

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

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

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

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

14% moisture content

10% moisture content

12% moisture content

8% moisture content

17. Quick lime is

(i) Slow in setting

(ii) Rapid in slacking

(iii) Good in strength

The correct answer is

Only (ii)

Both (i) and (ii)

Only (i)

Both (ii) and (iii)

18. 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

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

None of the above

Smaller than the size of a fully burnt brick

Equal to the size of a fully burnt brick

Greater than the size of a fully burnt brick

20. 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

0°

90°

30°

45°

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

60 minutes

600 minutes

10 minutes

30 minutes

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

Sand stone

Gypsum

Lime stone

Shale

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

None of these

Water

Varnish

Linseed oil

24. 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

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

Increases

First decreases to a certain minimum value and then increases

First increases to a certain maximum value and then decreases

Decreases

26. Quick lime is

Calcium oxide

Calcium carbonate

Calcium hydroxide

None of the above

27. Spalling hammer is used for

Rough dressing of stones

Driving wooden headed chisels

Breaking small projection of stones

Carving of stones

28. Good quality stones must

Be free from clay

Be durable

Resist action of acids

All the above

29. In a mortar, the binding material is

Cinder

Surkhi (brick-dust)

Sand

Cement

30. Plywood is normally available

1 mm thick

2 mm thick

2 to 3 mm thick

3 mm to 4 mm thick

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31. 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

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

A is true but R is false

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

10 hours

6 hours

1 hour

30 minutes

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

20

40

10

30

34. Which of the following represents a metamorphic rock?

(i) Slate

(ii) Shale

(iii) Quartzite

The correct answer is

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

Both (ii) and (iii)

Both (i) and (iii)

Only (iii)

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

Steel

Chromium plate

Stainless steel

High test plastic

36. Shingle is

Air weathered rock

Water bound pebbles

Crushed granite

Decomposed laterite

37. The stone suitable for rubble masonry should be.

Tough

Light

Heavy

Hard

38. Pick up the correct statement from the following:

In basic Bessemer process, the steel heats the converter

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

39. 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

40. 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)

Building Materials MCQs Set-7

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