Building Materials MCQs Set-7

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1. In a mortar, the binding material is

Sand

Cement

Cinder

Surkhi (brick-dust)

2. Sand stone is

Metamorphic rock

Sedimentary rock

Volcanic rock

Igneous rock

3. Shingle is

Water bound pebbles

Decomposed laterite

Air weathered rock

Crushed granite

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

Water

Linseed oil

Varnish

None of these

5. Spalling hammer is used for

Driving wooden headed chisels

Breaking small projection of stones

Rough dressing of stones

Carving of stones

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

1.5 to 2.0

3.0 to 3.5

2.0 to 2.5

2.5 to 3.0

7. The stone suitable for rubble masonry should be.

Hard

Light

Heavy

Tough

8.

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)

(ii) and (iii)

(iii) and (iv)

9. Pick up the correct statement from the following:

In basic Bessemer process, the steel heats the converter

In open-hearth process, the furnace heats the steel

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

All the above

10. 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

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

A is true but R is false

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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. Percentage of silica in a good brick earth lies between

50 to 60 %

5 to 10 %

20 to 30 %

70 to 80 %

13. Rapid hardening cement attains early strength due to

Lesser proportion of lime grounded finer than normal cement

Larger proportion of lime grounded finer than normal cement

Excess percentage of gypsum

Lesser proportion of lime grounded coarser than normal cement

14. Pick up the correct statement from the following:

Red short iron is of no value for welding purpose

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

All of these

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

15 %

20 %

5 %

10 %

16. In the method of condensation polymerization,

The reaction proceeds with an evolution of hydrogen chloride

The reaction proceeds with an evolution of ammonia

Low-molecular substances are removed from the high molecular substance

All of these

17. Lime putty

Can be used only upto three days

Is made from hydraulic lime

All of these

Is made by adding lime to water

18. Quick lime is

(i) Slow in setting

(ii) Rapid in slacking

(iii) Good in strength

The correct answer is

Only (ii)

Only (i)

Both (i) and (ii)

Both (ii) and (iii)

19. 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

30°

90°

0°

45°

20. 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

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21. 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

22. 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

All of these

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

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

High test plastic

Chromium plate

Stainless steel

Steel

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

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

None of the above

25. Good quality stones must

Be free from clay

Be durable

Resist action of acids

All the above

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

75 minutes

30 minutes

50 minutes

90 minutes

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

20

30

10

40

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

6 hours

1 hour

10 hours

30 minutes

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

Gypsum

Sand stone

Lime stone

Shale

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

Cambium layer

Annular rings

Heart wood

Medullary rays

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

30 minutes

60 minutes

10 minutes

600 minutes

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

14% moisture content

8% moisture content

10% moisture content

12% moisture content

33. Resins are

Left behind on evaporation of oil

Soluble in spirit

Used in varnishes

Not soluble in water

34. Pick up the correct statement from the following:

Styrene resin is produced from ethylene which is made from petroleum

All of these

Styrene resin transmits ultraviolet waves of light

Styrene resin is light in weight

35. Quick lime is

Calcium carbonate

Calcium oxide

None of the above

Calcium hydroxide

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

First increases to a certain maximum value and then decreases

Increases

Decreases

First decreases to a certain minimum value and then increases

37. Plywood is normally available

2 to 3 mm thick

2 mm thick

3 mm to 4 mm thick

1 mm thick

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

None of these

Grading of aggregates

Proportioning of aggregates

Fineness modulus

39. 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)

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

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

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

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

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

Building Materials MCQs Set-7

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