Building Materials MCQs Set-7

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1. Plywood is normally available

3 mm to 4 mm thick

2 mm thick

1 mm thick

2 to 3 mm thick

2. In a mortar, the binding material is

Cement

Surkhi (brick-dust)

Cinder

Sand

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

600 minutes

10 minutes

60 minutes

30 minutes

4. Spalling hammer is used for

Breaking small projection of stones

Driving wooden headed chisels

Carving of stones

Rough dressing of stones

5. Pick up the correct statement from the following:

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

All of these

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

None of these

Fineness modulus

Grading of aggregates

Proportioning of aggregates

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

None of these

Linseed oil

Water

Varnish

8. 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

9. The stone suitable for rubble masonry should be.

Heavy

Hard

Tough

Light

10. 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)

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

50 to 60 %

5 to 10 %

70 to 80 %

20 to 30 %

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

10 %

20 %

15 %

5 %

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

2.0 to 2.5

3.0 to 3.5

1.5 to 2.0

2.5 to 3.0

14. Pick up the correct statement from the following:

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

Red short iron is of no value for welding purpose

15. Shingle is

Water bound pebbles

Crushed granite

Decomposed laterite

Air weathered rock

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 (i) and (iii)

Only (iii)

Both (ii) and (iii)

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

30 minutes

10 hours

6 hours

1 hour

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

12% moisture content

8% moisture content

14% moisture content

10% moisture content

19. 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

(iii) and (iv)

(ii) and (iii)

(i) and (ii)

(i)and(iv)

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

Sand stone

Gypsum

Lime stone

Shale

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

Cambium layer

Annular rings

Heart wood

Medullary rays

22. Pick up the correct statement from the following:

In basic Bessemer process, the steel heats the converter

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

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

All of these

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

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

24. 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 and, R is the correct explanation of A

A is true but R is false

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

25. Pick up the correct statement from the following:

All of these

Styrene resin is produced from ethylene which is made from petroleum

Styrene resin is light in weight

Styrene resin transmits ultraviolet waves of light

26. Resins are

Soluble in spirit

Left behind on evaporation of oil

Used in varnishes

Not soluble in water

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

Chromium plate

High test plastic

Steel

Stainless steel

28. Good quality stones must

All the above

Resist action of acids

Be durable

Be free from clay

29. 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°

30°

45°

90°

30. In the method of condensation polymerization,

All of these

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

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

50 minutes

90 minutes

75 minutes

30 minutes

32. Pick up the correct statement from the following:

All of these

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

33. Sand stone is

Igneous rock

Metamorphic rock

Volcanic rock

Sedimentary rock

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

10

20

30

40

35.

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)

36. 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

Lesser proportion of lime grounded coarser than normal cement

Excess percentage of gypsum

37. 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%

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

First decreases to a certain minimum value and then increases

Increases

Decreases

First increases to a certain maximum value and then decreases

39. Quick lime is

Calcium carbonate

Calcium oxide

None of the above

Calcium hydroxide

40. Lime putty

Is made by adding lime to water

Is made from hydraulic lime

Can be used only upto three days

All of these

Building Materials MCQs Set-7

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