Building Materials MCQs Set-7

Page 1 of 4

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

5 %

10 %

20 %

15 %

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

Shale

Lime stone

Sand stone

Gypsum

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

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

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

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

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

4. 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

5. 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)

6. Spalling hammer is used for

Breaking small projection of stones

Carving of stones

Rough dressing of stones

Driving wooden headed chisels

7. Rapid hardening cement attains early strength due to

Lesser proportion of lime grounded finer than normal cement

Lesser proportion of lime grounded coarser than normal cement

Larger proportion of lime grounded finer than normal cement

Excess percentage of gypsum

8. Resins are

Used in varnishes

Soluble in spirit

Not soluble in water

Left behind on evaporation of oil

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

60 minutes

10 minutes

600 minutes

30 minutes

10.

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 (iv)

(i) and (ii)

(iii) and (iv)

(ii) and (iii)

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11. Which of the following represents a metamorphic rock?

(i) Slate

(ii) Shale

(iii) Quartzite

The correct answer is

Both (ii) and (iii)

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

Only (iii)

Both (i) and (iii)

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

Chromium plate

Stainless steel

Steel

High test plastic

13. Lime putty

Is made by adding lime to water

Is made from hydraulic lime

Can be used only upto three days

All of these

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

30

10

40

20

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

Fineness modulus

Proportioning of aggregates

Grading of aggregates

None of these

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

Annular rings

Heart wood

Medullary rays

Cambium layer

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

None of these

Water

Varnish

Linseed oil

18. 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

19. The stone suitable for rubble masonry should be.

Hard

Heavy

Light

Tough

20. In the method of condensation polymerization,

All of these

The reaction proceeds with an evolution of ammonia

Low-molecular substances are removed from the high molecular substance

The reaction proceeds with an evolution of hydrogen chloride

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

8% moisture content

12% moisture content

14% moisture content

10% moisture content

22. Pick up the correct statement from the following:

All of these

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

23. Pick up the correct statement from the following:

In open-hearth process, the furnace heats the steel

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

24. Good quality stones must

Resist action of acids

Be durable

All the above

Be free from clay

25. 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

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

30 minutes

50 minutes

90 minutes

75 minutes

27. Shingle is

Crushed granite

Air weathered rock

Decomposed laterite

Water bound pebbles

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

2.0 to 2.5

1.5 to 2.0

3.0 to 3.5

2.5 to 3.0

29. 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

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

30. In a mortar, the binding material is

Cinder

Sand

Cement

Surkhi (brick-dust)

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31. Sand stone is

Volcanic rock

Sedimentary rock

Igneous rock

Metamorphic rock

32. Plywood is normally available

2 mm thick

3 mm to 4 mm thick

2 to 3 mm thick

1 mm thick

33. 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°

30°

90°

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

(ii) and (iii)

(i) and (ii)

(iii) and (iv)

(i)and(iv)

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

1 hour

6 hours

30 minutes

10 hours

36. Quick lime is

Calcium hydroxide

Calcium oxide

Calcium carbonate

None of the above

37. 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 false but R is true

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

A is true but R is false

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

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

20 to 30 %

5 to 10 %

50 to 60 %

70 to 80 %

39. 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

40. Pick up the correct statement from the following:

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

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

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

Building Materials MCQs Set-7

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