In this post I will share some important questions which are frequently asked in competitive examinations such as SSC, UPSC and state PSCs.

Which of the following is the principal constituent of brick-earth?
1. Alumina
2. Silica
3. Lime
4. Magnesia
View Answer

Answer: a Alumina is the principal constituent of brick-earth as it imparts plasticity which is essential for brick moulding.

What is the function(s) of silica in the brick-earth?
1. It reduces shrinkage
2. It reduces cracking and warping
3. It makes the brick durable
4. All of the above
View Answer

Answer: d All of options are correct

Which of the following act as a flux in brick?
1. Lime
2. Oxide of Iron
3. Both a and b
4. Alumina
View Answer

Answer: c Lime and oxide of iron act as a flux and causes the grains of sand to melt, thus helps to bind the particle of brick earth together.

What will happen when excess amount of iron oxide is present in the brick-earth?
1. Makes the brick yellow
2. Makes the brick dark blue
3. Does not have any effect
4. cause efflorescence
View Answer

Answer: b Excess amount of oxide of iron makes the brick dark blue.

When brick become black in colour?
1. With excess amount of Lime
2. With excess amount of Magnesia
3. With excess amount of Manganese
4. When brick-earth contains kallar or reh
View Answer

Answer: c Excess amount of Manganese makes the brick black in colour.

Which of the following lowers the fusion point of brick-earth?
1. Alkalies
2. Kallar or reh
3. Salty Water
4. All of the above
View Answer

Answer: a Alkalies act as fluxes and lower the fusion point of brick-earth. If present in large quantity, they cause the bricks to fuse twist and warp during burning.

Select the incorrect statement.
1. Deficient ingredients are added to the brick-earth while blending
2. Water is added while tempering
3. Water is added while blending
4. The period of weathering may vary from few weeks to full season.
View Answer

Answer: c Deficient ingredients are added while blending and water is added while tempering

Select the correct statement.
1. Bricks are dried so that they do not warp and crack at kiln temperature.
2. Bricks are dried so that they do not damp the kiln.
3. Clamp can be classified as semi-continuous and continuous
4. The initial cost of a kiln is lesser than that of a clamp.
View Answer

Answer: a Bricks are dried so that they do not warp and crack at kiln temperature.

What is the size of a standard brick?
1. 190 mm X 90 mm X 90 mm
2. 200 mm X 100 mm X 100 mm
3. 210 mm X 90 mm X 80 mm
4. 224 mm X 110 mm X 90 mm
View Answer

Answer: a Size of a standard brick is 190 mm X 90 mm X 90 mm

What is the nominal size of a standard brick?
1. 190 mm X 90 mm X 90 mm
2. 200 mm X 100 mm X 100 mm
3. 210 mm X 90 mm X 80 mm
4. 224 mm X 110 mm X 90 mm
View Answer

Answer: b Nominal size of a standard brick is 200 mm X 100 mm X 100 mm

The depression on the top surface of the brick is known as ________
1. Key Hole
2. Frog
3. Depression
View Answer

Answer: b Depression on the top of the brick is known as frog.

What is the length of rectangular frog in a standard brick?
1. 60 mm
2. 80 mm
3. 100 mm
4. 110 mm
View Answer

Answer: c The length of rectangular frog in a standard brick is 100 mm.

What is the minimum compressive strength of first-class brick?
1. $5 \text{ } N/mm^2$
2. $10 \text{ } N/mm^2$
3. $12 \text{ } N/mm^2$
4. $15 \text{ } N/mm^2$
View Answer

Answer: b The minimum compressive strength of first class brick is $10 \text{ } N/mm^2$

What will happen when first bricks are stuck with one another?
1. They will break
2. They will produce a dull sound
3. They will produce a metallic sound
4. Nothing will happen
View Answer

Answer: c First class bricks will produce a metallic sound when stuck with one another.

First class brick should not absorb water more than _______ by weight after 24-hours immersion in cold water.
1. 5%
2. 10%
3. 15%
4. 20%
View Answer

Answer: d First class bricks should not absorb water more than 20% by weight after 24-hour immersion in cold water.

Second class brick should not absorb water more than _______ by weight after 24-hours immersion in cold water.
1. 20%
2. 21%
3. 22%
4. 23%
View Answer

Answer: c Second class bricks should not absorb water more than 22% by weight after 24-hour immersion in cold water.

Third class brick should not absorb water more than _______ by weight after 24-hours immersion in cold water.
1. 22%
2. 23%
3. 24%
4. 25%
View Answer

Answer: d Third class bricks should not absorb water more than 25% by weight after 24-hour immersion in cold water.

Water absorption capacity of refractory bricks varies from?.
1. 21 to 25 %
2. 16 to 20 %
3. 11 to 15 %
4. 4 to 10 %
View Answer

Answer: d Water absorption capacity of refractory bricks varies from 4 to 10 %.

What is the minimum compressive strength of a common brick?
1. $3.5 \text{ } N/mm^2$
2. $5 \text{ } N/mm^2$
3. $7.5 \text{ } N/mm^2$
4. $10 \text{ } N/mm^2$
View Answer

Answer: a According to IS 1077 minimum compressive strength of a common brick is $3.5 \text{ } N/mm^2$

Select the incorrect statement.
1. Efflorescence in bricks is said to be nil when deposits are less than 10 % of the exposed area of the bricks.
2. Efflorescence in bricks is said to be slight when deposits are not more than 10 % of the exposed area of the bricks.
3. Efflorescence in bricks is said to be moderate when deposits are up to 50 % of the exposed area of the bricks, unaccompanied by flaking of the surface.
4. Efflorescence in bricks is said to be heavy when deposits are covering 50 % or more of the exposed area of the bricks accompanied by flaking of the surface.
View Answer

Answer: a Efflorescence in bricks is said to be nil when there is no perceptible deposit.

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Building Material Questions (BM2)

In this post I will share some important questions which are frequently asked in competitive examinations such as SSC, UPSC and state PSCs.

Which of the following is the principal constituent of brick-earth?

Alumina Silica Lime Magnesia

What is the function(s) of silica in the brick-earth?

It reduces shrinkage It reduces cracking and warping It makes the brick durable All of the above

Which of the following act as a flux in brick?

Lime Oxide of Iron Both a and b Alumina

What will happen when excess amount of iron oxide is present in the brick-earth?

Makes the brick yellow Makes the brick dark blue Does not have any effect cause efflorescence

When brick become black in colour?

With excess amount of Lime With excess amount of Magnesia With excess amount of Manganese When brick-earth contains kallar or reh

Which of the following lowers the fusion point of brick-earth?

Alkalies Kallar or reh Salty Water All of the above

Select the incorrect statement.

Deficient ingredients are added to the brick-earth while blending Water is added while tempering Water is added while blending The period of weathering may vary from few weeks to full season.

Select the correct statement.

Bricks are dried so that they do not warp and crack at kiln temperature. Bricks are dried so that they do not damp the kiln. Clamp can be classified as semi-continuous and continuous The initial cost of a kiln is lesser than that of a clamp.

What is the size of a standard brick?

190 mm X 90 mm X 90 mm 200 mm X 100 mm X 100 mm 210 mm X 90 mm X 80 mm 224 mm X 110 mm X 90 mm

What is the nominal size of a standard brick?

190 mm X 90 mm X 90 mm 200 mm X 100 mm X 100 mm 210 mm X 90 mm X 80 mm 224 mm X 110 mm X 90 mm

The depression on the top surface of the brick is known as ________

Key Hole Frog Depression

What is the length of rectangular frog in a standard brick?

60 mm 80 mm 100 mm 110 mm

What is the minimum compressive strength of first-class brick?

$5 \text{ } N/mm^2$ $10 \text{ } N/mm^2$ $12 \text{ } N/mm^2$ $15 \text{ } N/mm^2$

What will happen when first bricks are stuck with one another?

They will break They will produce a dull sound They will produce a metallic sound Nothing will happen

First class brick should not absorb water more than _______ by weight after 24-hours immersion in cold water.

5% 10% 15% 20%

Second class brick should not absorb water more than _______ by weight after 24-hours immersion in cold water.

20% 21% 22% 23%

Third class brick should not absorb water more than _______ by weight after 24-hours immersion in cold water.

22% 23% 24% 25%

Water absorption capacity of refractory bricks varies from?.

21 to 25 % 16 to 20 % 11 to 15 % 4 to 10 %

What is the minimum compressive strength of a common brick?

$3.5 \text{ } N/mm^2$ $5 \text{ } N/mm^2$ $7.5 \text{ } N/mm^2$ $10 \text{ } N/mm^2$

Select the incorrect statement.

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Alumina

Silica

Lime

Magnesia

It reduces shrinkage

It reduces cracking and warping

It makes the brick durable

All of the above

Lime

Oxide of Iron

Both a and b

Alumina

Makes the brick yellow

Makes the brick dark blue

Does not have any effect

cause efflorescence

With excess amount of Lime

With excess amount of Magnesia

With excess amount of Manganese

When brick-earth contains kallar or reh

Alkalies

Kallar or reh

Salty Water

All of the above

Deficient ingredients are added to the brick-earth while blending

Water is added while tempering

Water is added while blending

The period of weathering may vary from few weeks to full season.

Bricks are dried so that they do not warp and crack at kiln temperature.

Bricks are dried so that they do not damp the kiln.

Clamp can be classified as semi-continuous and continuous

The initial cost of a kiln is lesser than that of a clamp.

190 mm X 90 mm X 90 mm

200 mm X 100 mm X 100 mm

210 mm X 90 mm X 80 mm

224 mm X 110 mm X 90 mm

190 mm X 90 mm X 90 mm

200 mm X 100 mm X 100 mm

210 mm X 90 mm X 80 mm

224 mm X 110 mm X 90 mm

Key Hole

Frog

Depression

60 mm

80 mm

100 mm

110 mm

$5 \text{ } N/mm^2$

$10 \text{ } N/mm^2$

$12 \text{ } N/mm^2$

$15 \text{ } N/mm^2$

They will break

They will produce a dull sound

They will produce a metallic sound

Nothing will happen

5%

10%

15%

20%

20%

21%

22%

23%

22%

23%

24%

25%

21 to 25 %

16 to 20 %

11 to 15 %

4 to 10 %

$3.5 \text{ } N/mm^2$

$5 \text{ } N/mm^2$

$7.5 \text{ } N/mm^2$

$10 \text{ } N/mm^2$