Building Materials MCQs Set-7

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

2.5 to 3.0

2.0 to 2.5

3.0 to 3.5

1.5 to 2.0

2. In the method of condensation polymerization,

The reaction proceeds with an evolution of hydrogen chloride

Low-molecular substances are removed from the high molecular substance

All of these

The reaction proceeds with an evolution of ammonia

3. Pick up the correct statement from the following:

Dr. L. Bakeland, a Belgian scientist prepared a product known as Bakelite

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

Pollark, an Austrian scientist prepared a substance from urea and formaldehyde and called it Plastic

All of these

4. Good quality stones must

Resist action of acids

All the above

Be free from clay

Be durable

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

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

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

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

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

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

Proportioning of aggregates

None of these

Fineness modulus

Grading of aggregates

7. In a mortar, the binding material is

Cement

Surkhi (brick-dust)

Cinder

Sand

8. 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

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

12% moisture content

10% moisture content

8% moisture content

14% moisture content

10. 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°

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11. Resins are

Used in varnishes

Not soluble in water

Left behind on evaporation of oil

Soluble in spirit

12. 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

All of these

Red short iron is of no value for welding purpose

13. Plywood is normally available

2 to 3 mm thick

2 mm thick

1 mm thick

3 mm to 4 mm thick

14. Pick up the correct statement from the following:

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

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

All of these

15. Quick lime is

Calcium oxide

Calcium hydroxide

None of the above

Calcium carbonate

16. 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)

17. Lime putty

All of these

Is made by adding lime to water

Is made from hydraulic lime

Can be used only upto three days

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

10 minutes

60 minutes

30 minutes

600 minutes

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

High test plastic

Stainless steel

Chromium plate

Steel

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

Equal to the size of a fully burnt brick

Greater than the size of a fully burnt brick

None of the above

Smaller than the size of a fully burnt brick

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

20 %

15 %

5 %

10 %

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

Decreases

First increases to a certain maximum value and then decreases

First decreases to a certain minimum value and then increases

Increases

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

30 minutes

6 hours

10 hours

1 hour

24. Pick up the correct statement from the following:

In open-hearth process, the furnace heats the steel

All the above

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

In basic Bessemer process, the steel heats the converter

25. 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

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

Water

Linseed oil

None of these

Varnish

27. Rapid hardening cement attains early strength due to

Lesser proportion of lime grounded finer than normal cement

Excess percentage of gypsum

Lesser proportion of lime grounded coarser than normal cement

Larger proportion of lime grounded finer than normal cement

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

90 minutes

75 minutes

50 minutes

30 minutes

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

Annular rings

Cambium layer

Medullary rays

Heart wood

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

5 to 10 %

70 to 80 %

50 to 60 %

20 to 30 %

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31. Spalling hammer is used for

Rough dressing of stones

Carving of stones

Breaking small projection of stones

Driving wooden headed chisels

32. Sand stone is

Igneous rock

Sedimentary rock

Metamorphic rock

Volcanic rock

33. The stone suitable for rubble masonry should be.

Light

Tough

Hard

Heavy

34. Quick lime is

(i) Slow in setting

(ii) Rapid in slacking

(iii) Good in strength

The correct answer is

Only (i)

Both (ii) and (iii)

Only (ii)

Both (i) and (ii)

35. Shingle is

Air weathered rock

Crushed granite

Decomposed laterite

Water bound pebbles

36. 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 true but R is false

A is false but R is true

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

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

Gypsum

Shale

Sand stone

Lime stone

38.

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)

(iii) and (iv)

(i) and (iv)

(i) and (ii)

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

20

40

30

10

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

(ii) and (iii)

(iii) and (iv)

(i) and (ii)

(i)and(iv)

Building Materials MCQs Set-7

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