Building Materials MCQs Set-7

June 11, 2021

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Page 1 of 4

1. 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)

(i)and(iv)

(ii) and (iii)

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

20 to 30 %

50 to 60 %

70 to 80 %

5 to 10 %

3. Lime putty

Can be used only upto three days

Is made by adding lime to water

All of these

Is made from hydraulic lime

4. Spalling hammer is used for

Carving of stones

Rough dressing of stones

Breaking small projection of stones

Driving wooden headed chisels

5. In a mortar, the binding material is

Cinder

Sand

Cement

Surkhi (brick-dust)

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

7. 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

8. Shingle is

Crushed granite

Water bound pebbles

Air weathered rock

Decomposed laterite

9. 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

Increases

Decreases

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

600 minutes

60 minutes

10 minutes

30 minutes

Page 2 of 4

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

90 minutes

75 minutes

30 minutes

50 minutes

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

Shale

Sand stone

Lime stone

Gypsum

13. Resins are

Soluble in spirit

Not soluble in water

Left behind on evaporation of oil

Used in varnishes

14. Plywood is normally available

1 mm thick

3 mm to 4 mm thick

2 mm thick

2 to 3 mm thick

15. Quick lime is

(i) Slow in setting

(ii) Rapid in slacking

(iii) Good in strength

The correct answer is

Both (i) and (ii)

Both (ii) and (iii)

Only (ii)

Only (i)

16. In the method of condensation polymerization,

The reaction proceeds with an evolution of ammonia

The reaction proceeds with an evolution of hydrogen chloride

Low-molecular substances are removed from the high molecular substance

All of these

17. The stone suitable for rubble masonry should be.

Light

Hard

Tough

Heavy

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

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

None of the above

19.

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

(ii) and (iii)

(i) and (ii)

(i) and (iv)

(iii) and (iv)

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

Water

None of these

Varnish

Linseed oil

Page 3 of 4

21. 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°

90°

0°

22. Pick up the correct statement from the following:

Styrene resin is produced from ethylene which is made from petroleum

Styrene resin transmits ultraviolet waves of light

All of these

Styrene resin is light in weight

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

Tangentially to annual rings, is known as tangential method

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

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

24. Rapid hardening cement attains early strength due to

Larger proportion of lime grounded finer than normal cement

Lesser proportion of lime grounded finer than normal cement

Excess percentage of gypsum

Lesser proportion of lime grounded coarser than normal cement

25. Pick up the correct statement from the following:

The sand stone with silicates resist a fire in a better way

All of these

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

26. Sand stone is

Sedimentary rock

Metamorphic rock

Igneous rock

Volcanic rock

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

5 %

10 %

20 %

15 %

28. Pick up the correct statement from the following:

All of these

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

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

29. 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 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 true but R is false

A is false but R is true

30. Which of the following represents a metamorphic rock?

(i) Slate

(ii) Shale

(iii) Quartzite

The correct answer is

Both (i) and (iii)

Only (iii)

Both (ii) and (iii)

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

Page 4 of 4

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

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

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

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

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

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

8% moisture content

14% moisture content

12% moisture content

10% moisture content

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

3.0 to 3.5

2.5 to 3.0

2.0 to 2.5

1.5 to 2.0

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

6 hours

10 hours

1 hour

30 minutes

35. Pick up the correct statement from the following:

Red short iron is of no value for welding purpose

All of these

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

36. Quick lime is

Calcium carbonate

None of the above

Calcium oxide

Calcium hydroxide

37. Good quality stones must

Be durable

Be free from clay

Resist action of acids

All the above

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

Cambium layer

Medullary rays

Heart wood

Annular rings

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

Chromium plate

Steel

Stainless steel

High test plastic

40. Pick up the correct statement from the following:

In basic Bessemer process, the steel heats the converter

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

Building Materials MCQs Set-7

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