Building Materials MCQs Set-7

Published June 11, 2021 · Updated June 11, 2021

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Page 1 of 4

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

2.5 to 3.0

1.5 to 2.0

3.0 to 3.5

2.0 to 2.5

2. Rapid hardening cement attains early strength due to

Lesser proportion of lime grounded coarser than normal cement

Lesser proportion of lime grounded finer than normal cement

Larger proportion of lime grounded finer than normal cement

Excess percentage of gypsum

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

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

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

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

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

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

50 to 60 %

20 to 30 %

70 to 80 %

5 to 10 %

5. Which of the following represents a metamorphic rock?

(i) Slate

(ii) Shale

(iii) Quartzite

The correct answer is

Only (iii)

Both (i) and (iii)

Both (ii) and (iii)

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

6. Spalling hammer is used for

Rough dressing of stones

Carving of stones

Breaking small projection of stones

Driving wooden headed chisels

7. Pick up the correct statement from the following:

Styrene resin transmits ultraviolet waves of light

All of these

Styrene resin is light in weight

Styrene resin is produced from ethylene which is made from petroleum

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

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

All of these

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

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

Equal to the size of a fully burnt brick

None of the above

Greater than the size of a fully burnt brick

Smaller than the size of a fully burnt brick

10. Quick lime is

Calcium hydroxide

Calcium oxide

Calcium carbonate

None of the above

Page 2 of 4

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

10 minutes

30 minutes

60 minutes

600 minutes

12.

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)

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

None of these

Water

Linseed oil

Varnish

14. In the method of condensation polymerization,

All of these

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

15. Good quality stones must

Resist action of acids

All the above

Be free from clay

Be durable

16. 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(iv)

(i) and (ii)

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

Lime stone

Gypsum

Sand stone

Shale

18. Pick up the correct statement from the following:

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

All of these

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

19. 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 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 false but R is true

20. Pick up the correct statement from the following:

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

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

All of these

Page 3 of 4

21. Pick up the correct statement from the following:

Cupola furnace is used for the manufacture of cast iron

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

All of these

22. In a mortar, the binding material is

Surkhi (brick-dust)

Sand

Cinder

Cement

23. Resins are

Left behind on evaporation of oil

Used in varnishes

Not soluble in water

Soluble in spirit

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

10 %

5 %

15 %

20 %

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

Chromium plate

Stainless steel

High test plastic

Steel

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

12% moisture content

10% moisture content

8% moisture content

14% moisture content

27. 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°

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

90 minutes

50 minutes

75 minutes

30 minutes

29. The stone suitable for rubble masonry should be.

Heavy

Hard

Light

Tough

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

Grading of aggregates

None of these

Proportioning of aggregates

Fineness modulus

Page 4 of 4

31. Lime putty

Is made from hydraulic lime

All of these

Can be used only upto three days

Is made by adding lime to water

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

33. Shingle is

Water bound pebbles

Crushed granite

Air weathered rock

Decomposed laterite

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

Annular rings

Medullary rays

Heart wood

Cambium layer

35. Plywood is normally available

1 mm thick

3 mm to 4 mm thick

2 mm thick

2 to 3 mm thick

36. Pick up the correct statement from the following:

All the above

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

In basic Bessemer process, the steel heats the converter

37. Sand stone is

Metamorphic rock

Volcanic rock

Igneous rock

Sedimentary rock

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

6 hours

1 hour

30 minutes

10 hours

39. Quick lime is

(i) Slow in setting

(ii) Rapid in slacking

(iii) Good in strength

The correct answer is

Only (ii)

Only (i)

Both (ii) and (iii)

Both (i) and (ii)

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

Decreases

First decreases to a certain minimum value and then increases

First increases to a certain maximum value and then decreases

Increases

Building Materials MCQs Set-7

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