Building Materials MCQs Set-7

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

First increases to a certain maximum value and then decreases

Decreases

Increases

First decreases to a certain minimum value and then increases

2. 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

All of these

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

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

600 minutes

60 minutes

30 minutes

10 minutes

4. 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

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

5. In a mortar, the binding material is

Cinder

Sand

Cement

Surkhi (brick-dust)

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

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

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

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

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

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

20 %

15 %

10 %

5 %

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

10

20

40

30

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

Steel

Chromium plate

Stainless steel

High test plastic

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

20 to 30 %

50 to 60 %

5 to 10 %

70 to 80 %

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

1 hour

10 hours

6 hours

30 minutes

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

Water

Linseed oil

None of these

Varnish

13. Lime putty

Can be used only upto three days

All of these

Is made from hydraulic lime

Is made by adding lime to water

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

(i)and(iv)

(i) and (ii)

(ii) and (iii)

(iii) and (iv)

15. Rapid hardening cement attains early strength due to

Lesser proportion of lime grounded finer than normal cement

Larger proportion of lime grounded finer than normal cement

Lesser proportion of lime grounded coarser than normal cement

Excess percentage of gypsum

16. In the method of condensation polymerization,

Low-molecular substances are removed from the high molecular substance

The reaction proceeds with an evolution of ammonia

The reaction proceeds with an evolution of hydrogen chloride

All of these

17. 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

18. 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)

19. Pick up the correct statement from the following:

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

All of these

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

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

2.5 to 3.0

3.0 to 3.5

2.0 to 2.5

1.5 to 2.0

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21. 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

Red short iron is of no value for welding purpose

Cupola furnace is used for the manufacture of cast iron

22.

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)

(ii) and (iii)

(iii) and (iv)

(i) and (iv)

23. Pick up the correct statement from the following:

All the above

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

24. Spalling hammer is used for

Rough dressing of stones

Carving of stones

Driving wooden headed chisels

Breaking small projection of stones

25. 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)

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

None of the above

Greater than the size of a fully burnt brick

Smaller than the size of a fully burnt brick

Equal to the size of a fully burnt brick

27. Good quality stones must

Be free from clay

All the above

Be durable

Resist action of acids

28. 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°

0°

30°

29. Plywood is normally available

1 mm thick

2 to 3 mm thick

3 mm to 4 mm thick

2 mm thick

30. The stone suitable for rubble masonry should be.

Light

Hard

Heavy

Tough

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

Shale

Lime stone

Sand stone

Gypsum

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

Fineness modulus

Grading of aggregates

Proportioning of aggregates

None of these

33. Sand stone is

Volcanic rock

Sedimentary rock

Igneous rock

Metamorphic rock

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

Heart wood

Annular rings

Medullary rays

Cambium layer

35. 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

A is true but R is false

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

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

50 minutes

75 minutes

90 minutes

30 minutes

37. Resins are

Not soluble in water

Soluble in spirit

Used in varnishes

Left behind on evaporation of oil

38. Shingle is

Air weathered rock

Crushed granite

Decomposed laterite

Water bound pebbles

39. Quick lime is

None of the above

Calcium hydroxide

Calcium oxide

Calcium carbonate

40. Pick up the correct statement from the following:

All of these

Styrene resin is produced from ethylene which is made from petroleum

Styrene resin transmits ultraviolet waves of light

Styrene resin is light in weight

Building Materials MCQs Set-7

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