Building Materials MCQs Set-7

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1. Lime putty

Is made from hydraulic lime

Is made by adding lime to water

All of these

Can be used only upto three days

2. Pick up the correct statement from the following:

The sand stone with silicates resist a fire in a better way

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

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

All of these

3. The stone suitable for rubble masonry should be.

Light

Heavy

Hard

Tough

4. Plywood is normally available

2 to 3 mm thick

1 mm thick

2 mm thick

3 mm to 4 mm thick

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

5 to 10 %

50 to 60 %

70 to 80 %

20 to 30 %

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

10

30

20

40

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

45°

0°

90°

30°

8. Pick up the correct statement from the following:

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

All of these

Cupola furnace is used for the manufacture of cast iron

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

Water

Varnish

None of these

Linseed oil

10. Quick lime is

(i) Slow in setting

(ii) Rapid in slacking

(iii) Good in strength

The correct answer is

Both (ii) and (iii)

Only (i)

Both (i) and (ii)

Only (ii)

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

10 hours

1 hour

30 minutes

6 hours

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

Heart wood

Cambium layer

Annular rings

Medullary rays

13. Resins are

Not soluble in water

Left behind on evaporation of oil

Used in varnishes

Soluble in spirit

14. In the method of condensation polymerization,

Low-molecular substances are removed from the high molecular substance

The reaction proceeds with an evolution of hydrogen chloride

All of these

The reaction proceeds with an evolution of ammonia

15. Pick up the correct statement from the following:

In Siemens process, the impurities of pig iron are oxidized by the oxygen of the ore

In open-hearth process, the furnace heats the steel

All the above

In basic Bessemer process, the steel heats the converter

16. 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

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

17. Rapid hardening cement attains early strength due to

Lesser proportion of lime grounded coarser than normal cement

Excess percentage of gypsum

Larger proportion of lime grounded finer than normal cement

Lesser proportion of lime grounded finer than normal cement

18. Quick lime is

Calcium carbonate

Calcium oxide

None of the above

Calcium hydroxide

19. Sand stone is

Metamorphic rock

Igneous rock

Sedimentary rock

Volcanic rock

20. 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)

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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

30 minutes

10 minutes

22. Pick up the correct statement from the following: Method of sawing timber

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

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

23. Shingle is

Air weathered rock

Crushed granite

Water bound pebbles

Decomposed laterite

24. 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

25.

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)

(i) and (iv)

(ii) and (iii)

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

Equal to the size of a fully burnt brick

None of the above

Smaller than the size of a fully burnt brick

Greater than the size of a fully burnt brick

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

12% moisture content

8% moisture content

14% moisture content

10% moisture content

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

30 minutes

90 minutes

50 minutes

75 minutes

29. 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

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

1.5 to 2.0

2.5 to 3.0

2.0 to 2.5

3.0 to 3.5

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

None of these

Fineness modulus

Proportioning of aggregates

Grading of aggregates

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

Chromium plate

Steel

High test plastic

Stainless steel

33. Which of the following represents a metamorphic rock?

(i) Slate

(ii) Shale

(iii) Quartzite

The correct answer is

Only (iii)

Both (ii) and (iii)

Both (i) and (iii)

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

34. Good quality stones must

Be free from clay

All the above

Resist action of acids

Be durable

35. Spalling hammer is used for

Rough dressing of stones

Driving wooden headed chisels

Carving of stones

Breaking small projection of stones

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

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

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

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

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

37. In a mortar, the binding material is

Surkhi (brick-dust)

Sand

Cement

Cinder

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

20 %

10 %

5 %

15 %

39. Pick up the correct statement from the following:

All of these

Styrene resin is light in weight

Styrene resin transmits ultraviolet waves of light

Styrene resin is produced from ethylene which is made from petroleum

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

Shale

Lime stone

Sand stone

Gypsum

Building Materials MCQs Set-7

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