Building Materials MCQs Set-7

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1. Quick lime is

Calcium oxide

None of the above

Calcium hydroxide

Calcium carbonate

2. Quick lime is

(i) Slow in setting

(ii) Rapid in slacking

(iii) Good in strength

The correct answer is

Only (i)

Both (i) and (ii)

Only (ii)

Both (ii) and (iii)

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

75 minutes

90 minutes

30 minutes

50 minutes

4. 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

Excess percentage of gypsum

Lesser proportion of lime grounded coarser than normal cement

5. 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

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

All of these

6. Plywood is normally available

1 mm thick

2 mm thick

2 to 3 mm thick

3 mm to 4 mm thick

7. 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°

45°

90°

30°

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

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

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

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

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

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

20 %

10 %

5 %

15 %

10. 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

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

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

Proportioning of aggregates

Grading of aggregates

None of these

Fineness modulus

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

2.0 to 2.5

2.5 to 3.0

1.5 to 2.0

3.0 to 3.5

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

Decreases

Increases

First decreases to a certain minimum value and then increases

First increases to a certain maximum value and then decreases

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

20

40

30

10

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 but R is not the correct explanation of A

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

A is true but R is false

A is false but R is true

16. Spalling hammer is used for

Driving wooden headed chisels

Rough dressing of stones

Carving of stones

Breaking small projection of stones

17. Good quality stones must

Be durable

Be free from clay

Resist action of acids

All the above

18. 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

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

14% moisture content

10% moisture content

8% moisture content

12% moisture content

20. 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

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

30 minutes

1 hour

6 hours

10 hours

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

Stainless steel

Chromium plate

Steel

High test plastic

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

Greater than the size of a fully burnt brick

Equal to the size of a fully burnt brick

Smaller than the size of a fully burnt brick

None of the above

24. Sand stone is

Sedimentary rock

Igneous rock

Metamorphic rock

Volcanic rock

25. 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

All of these

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

Tangentially to annual rings, is known as tangential method

26. Which of the following represents a metamorphic rock?

(i) Slate

(ii) Shale

(iii) Quartzite

The correct answer is

Only (iii)

Both (i) and (iii)

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

Both (ii) and (iii)

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

Varnish

Linseed oil

None of these

Water

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

Cambium layer

Heart wood

Annular rings

Medullary rays

29. In a mortar, the binding material is

Sand

Cement

Cinder

Surkhi (brick-dust)

30. Resins are

Not soluble in water

Used in varnishes

Soluble in spirit

Left behind on evaporation of oil

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31.

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

(ii) and (iii)

(i) and (iv)

(iii) and (iv)

(i) and (ii)

32. Lime putty

Is made from hydraulic lime

All of these

Can be used only upto three days

Is made by adding lime to water

33. 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

34. 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 (ii)

(i)and(iv)

(iii) and (iv)

(ii) and (iii)

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

Gypsum

Lime stone

Sand stone

Shale

36. Pick up the correct statement from the following:

Styrene resin is produced from ethylene which is made from petroleum

Styrene resin transmits ultraviolet waves of light

Styrene resin is light in weight

All of these

37. The stone suitable for rubble masonry should be.

Heavy

Tough

Hard

Light

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

70 to 80 %

5 to 10 %

20 to 30 %

50 to 60 %

39. In the method of condensation polymerization,

All of these

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

40. Shingle is

Water bound pebbles

Air weathered rock

Decomposed laterite

Crushed granite

Building Materials MCQs Set-7

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