Building Materials MCQs Set-7

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

12% moisture content

10% moisture content

14% moisture content

8% moisture content

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

50 to 60 %

70 to 80 %

20 to 30 %

5 to 10 %

3. In a mortar, the binding material is

Surkhi (brick-dust)

Cement

Sand

Cinder

4. Plywood is normally available

3 mm to 4 mm thick

2 to 3 mm thick

1 mm thick

2 mm thick

5. 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

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

A is false but R is true

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

6. Good quality stones must

Be durable

Resist action of acids

All the above

Be free from clay

7. Pick up the correct statement from the following:

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

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

All of these

8. Quick lime is

(i) Slow in setting

(ii) Rapid in slacking

(iii) Good in strength

The correct answer is

Both (i) and (ii)

Only (ii)

Only (i)

Both (ii) and (iii)

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

15 %

20 %

10 %

5 %

10. The stone suitable for rubble masonry should be.

Light

Heavy

Hard

Tough

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

Greater than the size of a fully burnt brick

Smaller than the size of a fully burnt brick

Equal to the size of a fully burnt brick

None of the above

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

Fineness modulus

None of these

Grading of aggregates

Proportioning of aggregates

13. Resins are

Not soluble in water

Soluble in spirit

Left behind on evaporation of oil

Used in varnishes

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

10 hours

1 hour

30 minutes

6 hours

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

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

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

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

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

16. In the method of condensation polymerization,

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

All of these

17. Pick up the correct statement from the following:

Styrene resin is light in weight

All of these

Styrene resin transmits ultraviolet waves of light

Styrene resin is produced from ethylene which is made from petroleum

18. 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

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

Chromium plate

High test plastic

Steel

Stainless steel

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

Cambium layer

Annular rings

Heart wood

Medullary rays

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21. Pick up the correct statement from the following:

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

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

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

90 minutes

50 minutes

75 minutes

30 minutes

23. Pick up the correct statement from the following:

All of these

Cupola furnace is used for the manufacture of cast iron

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

24. Lime putty

Is made by adding lime to water

Can be used only upto three days

Is made from hydraulic lime

All of these

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

10

20

40

30

26. 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

90°

45°

0°

30°

27. 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

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

Water

Linseed oil

Varnish

None of these

29. Shingle is

Crushed granite

Decomposed laterite

Air weathered rock

Water bound pebbles

30. Rapid hardening cement attains early strength due to

Larger proportion of lime grounded finer than normal cement

Lesser proportion of lime grounded coarser than normal cement

Excess percentage of gypsum

Lesser proportion of lime grounded finer than normal cement

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31. Spalling hammer is used for

Driving wooden headed chisels

Breaking small projection of stones

Rough dressing of stones

Carving of stones

32. Which of the following represents a metamorphic rock?

(i) Slate

(ii) Shale

(iii) Quartzite

The correct answer is

Both (i) and (iii)

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

Both (ii) and (iii)

Only (iii)

33. 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)

(ii) and (iii)

(iii) and (iv)

34. 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

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

Gypsum

Sand stone

Lime stone

Shale

36. Sand stone is

Metamorphic rock

Sedimentary rock

Igneous rock

Volcanic rock

37.

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)

(ii) and (iii)

(i) and (ii)

(iii) and (iv)

38. Quick lime is

Calcium oxide

Calcium carbonate

None of the above

Calcium hydroxide

39. 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

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

600 minutes

60 minutes

30 minutes

10 minutes

Building Materials MCQs Set-7

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