Building Materials MCQs Set-7

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1. Pick up the correct statement from the following:

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

All of these

2. In a mortar, the binding material is

Cinder

Surkhi (brick-dust)

Cement

Sand

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

None of the above

Smaller than the size of a fully burnt brick

Greater than the size of a fully burnt brick

Equal to the size of a fully burnt brick

4. Resins are

Left behind on evaporation of oil

Not soluble in water

Soluble in spirit

Used in varnishes

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

Sand stone

Gypsum

Shale

Lime stone

6. Rapid hardening cement attains early strength due to

Excess percentage of gypsum

Larger proportion of lime grounded finer than normal cement

Lesser proportion of lime grounded coarser than normal cement

Lesser proportion of lime grounded finer than normal cement

7. Shingle is

Crushed granite

Water bound pebbles

Air weathered rock

Decomposed laterite

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

Varnish

None of these

Water

Linseed oil

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

20 to 30 %

50 to 60 %

70 to 80 %

5 to 10 %

10. Pick up the correct statement from the following:

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

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. The age of a tree can be known by examining

Heart wood

Annular rings

Cambium layer

Medullary rays

12. 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

Tangentially to annual rings, is known as tangential method

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

13. Spalling hammer is used for

Carving of stones

Rough dressing of stones

Driving wooden headed chisels

Breaking small projection of stones

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)

(iii) and (iv)

(i) and (ii)

(ii) and (iii)

15. Pick up the correct statement from the following:

All of these

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

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

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

60 minutes

10 minutes

30 minutes

600 minutes

17. 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°

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

90 minutes

30 minutes

50 minutes

75 minutes

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

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

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

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

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

20. Good quality stones must

Be durable

Resist action of acids

Be free from clay

All the above

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

High test plastic

Stainless steel

Chromium plate

Steel

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

Grading of aggregates

Fineness modulus

None of these

Proportioning of aggregates

23. Sand stone is

Metamorphic rock

Volcanic rock

Sedimentary rock

Igneous rock

24. Quick lime is

Calcium hydroxide

Calcium oxide

Calcium carbonate

None of the above

25. The stone suitable for rubble masonry should be.

Hard

Heavy

Tough

Light

26. Pick up the correct statement from the following:

Styrene resin transmits ultraviolet waves of light

Styrene resin is produced from ethylene which is made from petroleum

All of these

Styrene resin is light in weight

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

20

10

40

30

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

14% moisture content

12% moisture content

10% moisture content

8% moisture content

29. 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

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

6 hours

30 minutes

10 hours

1 hour

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

5 %

15 %

20 %

10 %

32.

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)

33. Quick lime is

(i) Slow in setting

(ii) Rapid in slacking

(iii) Good in strength

The correct answer is

Only (i)

Only (ii)

Both (i) and (ii)

Both (ii) and (iii)

34. Which of the following represents a metamorphic rock?

(i) Slate

(ii) Shale

(iii) Quartzite

The correct answer is

Only (iii)

Both (i) and (iii)

Both (ii) and (iii)

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

35. 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 hydrogen chloride

The reaction proceeds with an evolution of ammonia

36. Plywood is normally available

2 to 3 mm thick

1 mm thick

3 mm to 4 mm thick

2 mm thick

37. 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

38. Lime putty

Is made by adding lime to water

Is made from hydraulic lime

All of these

Can be used only upto three days

39. Pick up the correct statement from the following:

In basic Bessemer process, the steel heats the converter

All the above

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

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

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

Building Materials MCQs Set-7

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