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# Objective Questions of Structural Clay Products | Solved MCQ of Structural Clay Products | S K Duggal Solved Questions Of Structural Clay Products | Structural Clay Products Question-Answers | Bricks | Construction Materials | By Ashutosh Nautiyal

1. Consider the following statements: Good soil for making bricks should contain (1) about 30% alumina (2) about 10% lime nodules (3) a small number of iron oxides (4) about 15% magnesia Of these statements (a) 1 and 2 are correct (b) 1 and 3 are corect (c) 1, 3 and 4 are correct (d) 2, 3 and 4 are correct Answer:- (a) 1 and 2 are correct 2. If L is the length and B the width of the brick and t the thickness of mortar, the relation between these is (a) L = 2B (b) L = B + t (c) L = B + 2 t (d) L = 2B + t

## Solved Objective Questions (S K Duggal)

1. Consider the following statements:

Good soil for making bricks should contain

(3) a small number of iron oxides

Of these statements

(a) 1 and 2 are correct (b) 1 and 3 are corect

(c) 1, 3 and 4 are correct (d) 2, 3 and 4 are correct

Answer:- (a) 1 and 2 are correct

2. If L is the length and B the width of the brick and t the thickness of mortar, the relation

between these is
(a) L = 2B (b) L = B + t

(c) L = B + 2 t (d) L = 2B + t

3. The weight of a standard brick should be

(a) 1000 g (b) 1500 g

(c) 2500 g (d) 3000 g

4. Frog is provided in

(i) 9 cm high bricks only

(ii) 4 cm high bricks only

(iii) extruded bricks only

Of the above

(a) only (i) is correct (b) only (ii) is correct

(c) (i) and (iii) are correct (d) (i), (ii) and (iii) are correct

Answer:- (a) only (i) is correct

5. The most important purpose of frog in brick is to

(a) emboss manufacturer's name

(b) reduce the weight of brick

(c) form keyed joint between brick and mortar

(d) improve insulation by providing 'hollows'

Answer:- (c) form keyed joint between brick and motor

6. Consider the following statements :

(1) About 25% of alumina in brick earth imparts the plasticity necessary for moulding bricks into the required shape

(2) Iron pyrite present in brick earth preserves the form of the bricks at high temperatures.

(3) Presence of weeds in brick earth makes the bricks unsound.

Which of these statements are correct?

(a) 1 and 2 (b) 1 and 3

(c) 2 and 3 (d) 1, 2 and 3

7. Water absorption for Ist class bricks should not be more than

(a) 12% (b) 15%
(c) 20% (d) 25%

8. For hidden masonry works the bricks used should be

(a) Ist Class (b) IInd Class

(c) IIIrd Class (d) for any of the above

9. For centring of R.C.C. structures, the bricks used should be

(a) Ist Class (b) IInd Class

(c) IIIrd Class (d) IVth Class

10. Match List-I (Constituents of bricks) with List-II (Corresponding influence) and select the
correct answer using the codes given below the lists :

List-I                                List-II

(Constituents of bricks) (Corresponding influence)

A. Alumina 1. Colour of brick

B. Silica 2. Plasticity recovery for moulding

C. Magnesia 3. Reacts with silica during burning and causes particles to unite together and development of strength

D. Limestone 4. Preserves the form of brick at high temperature and prevents shrinkage

Codes :

(a) A B C D (b) A B C D

2 1 4 3          3 4 1 2

(c) A B C D (d) A B C D

2 4 1 3          3 1 4 2

Answer:- (c) A B C D

2 4  1  3

11. The IS classification of bricks is based on

(i) compressive strength

(ii) water absorption

(iii) dimensional tolerance

Of the above

(a) only (i) is correct (b) (i) and (ii) are correct

(c) (i) and (iii) are correct (d) (i), (ii) and (iii) are correct

Answer:- (c)  (i) and (iii) are correct

12. Which of the following constituent in the earth gives plasticity to mould bricks in suitable shape?

(a) Silica (b) Lime

(c) Alumina (d) Magnesia

13. The raw bricks shrink during drying and warp during burning because of

(a) less lime in brick earth

(b) less silica and excess magnesia in brick earth

(c) excess of alumina and silica in brick earth

(d) alkalis in brick earth

Answer:- (c) excess of silica and excess magnesia in brick earth

14. The moulded bricks are dried before burning to an approximate moisture content of

(a) 3% (b) 6%

(c) 10% (d) 20%

15. In the process of brick manufacturing, the pug mill is used in which of the following operation?

(a) Weathering (b) Blending

(c) Tempering (d) Burning

16. Consider the following statements :

For the manufacture of good quality bricks, it is essential to

(1) use a reverberatory kiln

(2) blend the soil with clay or sand as deemed appropriate

(3) knead the soil in a Ghani

(4) temper the soil in a pug mill

Of these statements

(a) 1 and 3 are correct (b) 2 and 4 are correct

(c) 1, 3 and 4 are correct (d) 2, 3 and 4 are correct

Answer:- (b) 2 and 4 are correct

17. Bricks are burnt at a temperature range of

(a) 500° to 700° C (b) 700° to 900° C

(c) 900° to 1200° C (d) 1200° to 1500° C

Answer:- (c) 900° to 1200° C

18. Match List-I with List-II and select the correct answer using the codes given below the lists :

List-I            List-II

(Ingredients)  (%)

(A) Silica (1) 50 – 60%

(B) Lime (2) 20 – 30%

(C) Alumina (3) 10%

(D) Alkalis (4) <10%

Codes :

(a) A B C D (b) A B C D

1  2  3  4       1  3  2  4

(c) A B C D (d) A B C D

1  2  4  3       2  1  4  3

#### Answer:- (b) A B C D                       1  3  2  4

19. Match List-I with List-II and select the correct answer using the codes given below the lists :

List-I              List-II

(Ingredients) (Property)

A. Silica 1. imparts durability, prevents shrinkage

B. Alumina 2. softens clay

C. Lime 3. renders clay plastic

D. Ferric Oxide 4. lowers fusing point

Codes :

(a) A B C D (b) A B C D

1  3  2  4       1  4  2  3

(c) A B C D (d) A B C D

1  3  4  2       4  3  1 2

Answer:- (c) A B C D

1  3  4  2

20. Excess of silica makes brick

(a) brittle on burning (b) to melt on burning

(c) to crack on drying (d) to warp

21. Which of the following is harmful in the clay used for making bricks?

(a) Iron oxide (b) Iron pyrite

(c) Alkali (d) Magnesia

22. When carbonaceous materials in the form of bituminous matter of carbon are present in
the clay, the bricks will

(a) be spongy (b) have a black core

(c) be porous (d) have cracks

Answer:- (b) have a black core

23. Swollen structure and white blotches will be found in bricks when

(a) carbon (b) bituminous matter

(c) organic matter (d) sulphur

is present in clay used for making bricks.

24. Consider the following properties

1. Strength development during firing

2. Drying shrinkage

3. Shaping

When fly ash is used as an additive with clay in brick manufacturing the improved properties are

(a) 1 only (b) 2 only

(c) 1 and 2 (d) 1 and 3

25. Consider the following stages in the manufacturing of bricks :

1. Weathering 2. Moulding

3. Tempering

The correct sequence of these stages in the manufacturing of the bricks is

(a) 1, 2, 3 (b) 2, 3, 1

(c) 1, 3, 2 (d) 3, 2, 1

26. Consider the following operations of preparation of brick earth

1. Digging 2. Weathering

3. Tempering 4. Blending

5. Unsoiling

The correct sequence of these operations are

(a) 5, 1, 2, 4, 3 (b) 5, 1, 3, 2, 4

(c) 1, 5, 2, 4, 3 (d) 5, 1, 4, 2, 3

#### Answers:- (a) 5, 1, 2, 4, 3

27. In some brick masonry walls, patches of whitish crystals were found on the exposed surfaces, also chipping and spalling of bricks took place from the same walls. Which among the following are the causes of these defects?

3. Sulphate attack 4. Efflorescence

Codes :

(a) 1 and 2 (b) 2 and 3

(c) 2 and 4 (d) 3 and 4

28. The efflorescence of bricks is due to

(a) soluble salts present in clay for making bricks

(b) the high porosity of bricks

(c) high silt content in brick earth

(d) excessive burning of bricks

Answer:- (a) soluble salts present in clay for making bricks

29. What is efflorescence?

(a) Formation of white patches on the brick surface due to insoluble salts in the brick clay.

(b) Swelling of brick due to the presence of carbonaceous matter and gas

(c) Deformation of brick due to exposure to rain

(d) Impurities in the brick clay which show after burning

Answer:- (a) Formation of white patches on the brick surface due to insoluble salts in the brick clay.

30. Consider the following with regards to burning of clay bricks.

1. The clay loses its plasticity

2. Carbonate minerals are decarbonated

3. Some of the carbonaceous matter is burnt

4. Clay mass is converted into a glass-like substance

5. Ferrous iron is oxidized to ferric form

The changes that occur during dehydration period are :

(a) 1, 3, 5 (b) 1, 2, 4

(c) 1, 2, 3 (d) 2, 4, 5

31. When the deposits of efflorescence are more than 10 per cent but less than 50 per cent of the exposed areas of brick, the presence of efflorescence is classified as

(a) slight (b) moderate

(c) heavy (d) serious

32. A good brick when immersed in a water bath for 24 hours, should not absorb water more than

(a) 20% of its dry weight (b) 15 % of its saturated weight

(c) 10% of its saturated weight (d) 20% of its saturated weight

Answer:- (a) 20% of its dry weight

33. Crushed pottery is used in the manufacture of

(a) fire bricks (b) stone bricks

(c) terracotta (d) clay tiles

34. Match List-I with List-II and select the correct answer used the codes given below the lists:

List-I                List-II

A. Acid Brick 1. Made from Quartzite

B. Silica Brick 2. Made from magnesite

C. Basic Brick 3. Made from fire clay

D. Neutral Brick 4. Made from chromite

Codes :

(a) A B C D (b) A B C D

3  1  2  4       3  2  1 4

(c) A B C D (b) A B C D

4  1  2  3       1  2  3  4

3  1  2  4

35. The compressive strength of burnt clay bricks as per IS 1077 is

(a) 100 kg/cm2 (b) 150 kg/cm2

(c) 100 – 150 kg/cm2 (d) 35 – 350 kg/cm2

36. The deformation of the shape of bricks caused by the rainwater falling on the hot bricks is known as

(a) spots (b) checks

(c) chuffs (d) blisters

37. The defect in clay products because of imprisoned air during their moulding is known as

(a) blister (b) lamination

(c) cracks (d) spots

38. Basic refractory bricks consist of

(a) silica bricks (b) ganister bricks

(c) magnesia bricks (d) chromite bricks

39. In the steel industry, the bricks used for lining furnaces should be

(a) acid refractory (b) basic refractory

(c) neutral refractory (d) heavy-duty

40. Terracotta is burned in

(a) pug mill (b) reverberatory furnace

(c) muffle furnace (d) puddling furnace

41. Glazing of clay product is achieved by throwing sodium chloride in the kiln at a temperature of

(a) 600 – 800° C (b) 700 – 1000° C

(c) 900 – 1100° C (d) 1200 – 1300° C

42. The bricks which are extensively used for basic refractories in furnaces are

(a) chrome bricks (b) sillimanite bricks

(c) magnesite bricks (d) forsterite bricks

43. Which one of the following procedure is applied to determine the soundness of bricks?

(a) Immersing the bricks underwater for 16 hrs and determining the quantity of water absorbed by the brick

(b) Immersing the brick underwater for 24 hrs and determining its expansion using Le Chatelier apparatus

(c) Taking two bricks, hitting one against the other and observing whether they break or not and the type of sound produced while hitting

(d) Scratching the brick by a fingernail and noting whether any impression is made or not

Answer:- (a) Immersing the bricks underwater for 16 hrs and determining the quantity of water absorbed by the brick

44. The number of bricks required per cubic meter of brick masonry is

(a) 400 (b) 450

(c) 500 (d) 550

*Self Typed
*Source- Internet, Books, Self-Analysis

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