Building Materials MCQs Set-7

June 11, 2021

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1. 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

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

50 minutes

75 minutes

30 minutes

90 minutes

3. 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)

Both (ii) and (iii)

Only (ii)

4. In the method of condensation polymerization,

All of these

The reaction proceeds with an evolution of hydrogen chloride

Low-molecular substances are removed from the high molecular substance

The reaction proceeds with an evolution of ammonia

5. 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

6. 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

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

7. 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

8. 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°

9. 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

10. 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(iv)

(ii) and (iii)

(i) and (ii)

(iii) and (iv)

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

12. Pick up the correct statement from the following:

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

All of these

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

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

13. Shingle is

Water bound pebbles

Air weathered rock

Crushed granite

Decomposed laterite

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

Equal to the size of a fully burnt brick

Greater than the size of a fully burnt brick

Smaller than the size of a fully burnt brick

None of the above

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

10 hours

30 minutes

1 hour

6 hours

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

70 to 80 %

20 to 30 %

5 to 10 %

50 to 60 %

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

Stainless steel

Chromium plate

High test plastic

Steel

18.

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)

19. 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

20. Resins are

Used in varnishes

Soluble in spirit

Left behind on evaporation of oil

Not soluble in water

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21. Spalling hammer is used for

Driving wooden headed chisels

Rough dressing of stones

Breaking small projection of stones

Carving of stones

22. Rapid hardening cement attains early strength due to

Excess percentage of gypsum

Larger proportion of lime grounded finer than normal cement

Lesser proportion of lime grounded finer than normal cement

Lesser proportion of lime grounded coarser than normal cement

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

15 %

20 %

10 %

5 %

24. Sand stone is

Metamorphic rock

Volcanic rock

Igneous rock

Sedimentary rock

25. In a mortar, the binding material is

Cinder

Surkhi (brick-dust)

Cement

Sand

26. The stone suitable for rubble masonry should be.

Heavy

Tough

Hard

Light

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

10% moisture content

14% moisture content

8% moisture content

12% moisture content

28. 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:

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

A is false but R is true

29. Which of the following represents a metamorphic rock?

(i) Slate

(ii) Shale

(iii) Quartzite

The correct answer is

Both (i) and (iii)

Both (ii) and (iii)

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

Only (iii)

30. 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

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31. Plywood is normally available

2 mm thick

2 to 3 mm thick

1 mm thick

3 mm to 4 mm thick

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

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

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

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

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

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

None of these

Grading of aggregates

Fineness modulus

Proportioning of aggregates

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

Linseed oil

None of these

Varnish

Water

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

Gypsum

Lime stone

Sand stone

Shale

36. Lime putty

Is made by adding lime to water

Is made from hydraulic lime

Can be used only upto three days

All of these

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

Decreases

Increases

First increases to a certain maximum value and then decreases

First decreases to a certain minimum value and then increases

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

Medullary rays

Cambium layer

Heart wood

Annular rings

39. Quick lime is

Calcium oxide

Calcium carbonate

None of the above

Calcium hydroxide

40. Good quality stones must

Be durable

All the above

Resist action of acids

Be free from clay

Building Materials MCQs Set-7

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