Building Materials MCQs Set-7

June 11, 2021

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1. Pick up the correct statement from the following:

In open-hearth process, the furnace heats the steel

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

All the above

2. Rapid hardening cement attains early strength due to

Larger proportion of lime grounded finer than normal cement

Lesser proportion of lime grounded coarser than normal cement

Lesser proportion of lime grounded finer than normal cement

Excess percentage of gypsum

3. Good quality stones must

Be durable

Resist action of acids

Be free from clay

All the above

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

50 to 60 %

5 to 10 %

20 to 30 %

70 to 80 %

5. In a mortar, the binding material is

Sand

Cinder

Cement

Surkhi (brick-dust)

6. Quick lime is

(i) Slow in setting

(ii) Rapid in slacking

(iii) Good in strength

The correct answer is

Both (ii) and (iii)

Both (i) and (ii)

Only (i)

Only (ii)

7. 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

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

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

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

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

Shale

Sand stone

Gypsum

Lime stone

10. Quick lime is

Calcium carbonate

Calcium oxide

Calcium hydroxide

None of the above

Page 2 of 4

11. Pick up the correct statement from the following:

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

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

12. 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

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

Proportioning of aggregates

Grading of aggregates

Fineness modulus

None of these

14. Resins are

Soluble in spirit

Used in varnishes

Left behind on evaporation of oil

Not soluble in water

15. 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)

(i) and (ii)

(ii) and (iii)

(i)and(iv)

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

First increases to a certain maximum value and then decreases

First decreases to a certain minimum value and then increases

Decreases

Increases

17. Sand stone is

Sedimentary rock

Metamorphic rock

Igneous rock

Volcanic rock

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

None of the above

Greater than the size of a fully burnt brick

Equal to the size of a fully burnt brick

Smaller than the size of a fully burnt brick

19. Plywood is normally available

2 to 3 mm thick

1 mm thick

2 mm thick

3 mm to 4 mm thick

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

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

Page 3 of 4

21. Pick up the correct statement from the following:

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

Cupola furnace is used for the manufacture of cast iron

Red short iron is of no value for welding purpose

All of these

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

15 %

10 %

5 %

20 %

23. The stone suitable for rubble masonry should be.

Light

Hard

Tough

Heavy

24. 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

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

None of these

Linseed oil

Water

Varnish

26.

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)

(i) and (iv)

(ii) and (iii)

(iii) and (iv)

27. Shingle is

Decomposed laterite

Crushed granite

Water bound pebbles

Air weathered rock

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

90 minutes

30 minutes

50 minutes

75 minutes

29. 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

30. 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°

0°

90°

45°

Page 4 of 4

31. 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

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

2.5 to 3.0

1.5 to 2.0

2.0 to 2.5

3.0 to 3.5

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

10 hours

1 hour

6 hours

30 minutes

34. Spalling hammer is used for

Driving wooden headed chisels

Rough dressing of stones

Breaking small projection of stones

Carving of stones

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

High test plastic

Chromium plate

Steel

Stainless steel

36. 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

37. Which of the following represents a metamorphic rock?

(i) Slate

(ii) Shale

(iii) Quartzite

The correct answer is

Both (ii) and (iii)

Only (iii)

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

Both (i) and (iii)

38. Lime putty

Is made by adding lime to water

Can be used only upto three days

Is made from hydraulic lime

All of these

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

Cambium layer

Annular rings

Heart wood

Medullary rays

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

Building Materials MCQs Set-7

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