Building Materials MCQs Set-7

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1. 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

2. 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)

(ii) and (iii)

(i)and(iv)

(iii) and (iv)

3. Pick up the correct statement from the following:

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

All of these

4. The stone suitable for rubble masonry should be.

Hard

Light

Tough

Heavy

5. Quick lime is

(i) Slow in setting

(ii) Rapid in slacking

(iii) Good in strength

The correct answer is

Both (i) and (ii)

Only (i)

Only (ii)

Both (ii) and (iii)

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

Chromium plate

High test plastic

Steel

Stainless steel

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

None of these

Fineness modulus

Proportioning of aggregates

Grading of aggregates

8. Pick up the correct statement from the following:

Styrene resin is light in weight

Styrene resin is produced from ethylene which is made from petroleum

All of these

Styrene resin transmits ultraviolet waves of light

9. Lime putty

Is made from hydraulic lime

Can be used only upto three days

Is made by adding lime to water

All of these

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

30°

45°

0°

90°

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

Cambium layer

Heart wood

Annular rings

Medullary rays

12. Pick up the correct statement from the following: Method of sawing timber

Tangentially to annual rings, is known as tangential method

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

Cut out of quarter logs, parallel to the medullary rays and perpendicular to annual rings, is known as radial sawing

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

30

20

40

10

14. Resins are

Used in varnishes

Left behind on evaporation of oil

Soluble in spirit

Not soluble in water

15. 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

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

Gypsum

Shale

Sand stone

Lime stone

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

50 minutes

30 minutes

75 minutes

90 minutes

18. Good quality stones must

Resist action of acids

Be durable

All the above

Be free from clay

19. 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%

20. Spalling hammer is used for

Driving wooden headed chisels

Breaking small projection of stones

Carving of stones

Rough dressing of stones

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21. 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

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

A is false but R is true

22. Quick lime is

Calcium hydroxide

Calcium carbonate

None of the above

Calcium oxide

23. Sand stone is

Volcanic rock

Metamorphic rock

Sedimentary rock

Igneous rock

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

3.0 to 3.5

2.0 to 2.5

2.5 to 3.0

1.5 to 2.0

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

10 %

15 %

5 %

20 %

26. Pick up the correct statement from the following:

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

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

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

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

First decreases to a certain minimum value and then increases

First increases to a certain maximum value and then decreases

Increases

Decreases

28. 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)

Both (i) and (iii)

Only (iii)

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

30 minutes

6 hours

1 hour

10 hours

30.

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)

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

60 minutes

30 minutes

10 minutes

600 minutes

32. 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

33. Shingle is

Water bound pebbles

Air weathered rock

Decomposed laterite

Crushed granite

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

Varnish

None of these

Linseed oil

Water

35. Rapid hardening cement attains early strength due to

Excess percentage of gypsum

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

36. Pick up the correct statement from the following:

Cupola furnace is used for the manufacture of cast iron

All of these

Red short iron is of no value for welding purpose

Air bubbles in casting produce a dull sound by tapping their surfaces lightly with a hammer

37. Plywood is normally available

2 to 3 mm thick

1 mm thick

3 mm to 4 mm thick

2 mm thick

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

20 to 30 %

5 to 10 %

50 to 60 %

70 to 80 %

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

12% moisture content

14% moisture content

8% moisture content

10% moisture content

40. In a mortar, the binding material is

Cinder

Cement

Surkhi (brick-dust)

Sand

Building Materials MCQs Set-7

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