Olete.in – MCQs, Mock Tests & Government Job Prep | Biotechnology Biotechnology MCQ set-3

What function does iron oxide perform in cement?

1. Increases strength
2. Makes cement sound
3. Increases setting time
4. Acts as flux

✅ Correct Answer: 4

How many major ingredients are present in the composition of cement?

1. 8
2. 5
3. 10
4. 6

✅ Correct Answer: 1

Sulphur in cement is present in what amount?

1. 0.5 – 6 g
2. 1 – 2.5%
3. 0.5 – 6%
4. 1 – 2.5g

✅ Correct Answer: 2

In the same figure in question 2, what is ‘b’ and its function?

1. Water-plasticity
2. Lime-strength
3. Sulphur-soundness
4. Gypsum-control setting

✅ Correct Answer: 4

How is the argillaceous material used in the manufacture of cement stored?

1. Silos
2. Basins
3. Bags
4. Storage tanks

✅ Correct Answer: 2

Which one of the below is rarely used as fuel in burning stage of wet process of cement manufacturing?

1. Wood
2. Gas
3. Pulverised coal
4. Fuel oil

✅ Correct Answer: 1

How much does a bag of cement weigh?

1. 1 kg
2. 25 kg
3. 50 kg
4. 35 kg

✅ Correct Answer: 3

What is the advantage of using precalciner?

1. Fine grained cement
2. Larger clinker size
3. Fuel efficiency
4. Sound cement

✅ Correct Answer: 3

Which stone provides the calcareous component required for the manufacture of cement?

1. Lime
2. Limestone
3. Marble
4. Granite

✅ Correct Answer: 2

Which one of the below is not a feature of cement Kiln?

1. Employs alternate fuels
2. Natural alkaline environment
3. High temperature
4. Portable

✅ Correct Answer: 4

What is the abbreviation of PPC?

1. Perfect Portland Cement
2. Portland Produced Cement
3. Portland Pozzolana Cement
4. Productive Portland Cement

✅ Correct Answer: 3

Which of the following is not an advantage of rapid hardening cement?

1. Faster construction
2. Short curing period
3. Light in weight
4. Higher final setting time

✅ Correct Answer: 4

How many types of cement are there based on the ability to set in presence of water?

1. 2
2. 3
3. 4
4. 5

✅ Correct Answer: 1

What property does air-entraining cement provide?

1. Workability
2. Soundness
3. Fineness
4. Strength

✅ Correct Answer: 1

Which of the following types of cement is used in marine structures?

1. Expanding cement
2. High alumina cement
3. Blast furnace slag cement
4. White cement

✅ Correct Answer: 3

Which pair of the compound and coloured cement mentioned below is wrong?

1. Iron oxide-yellow
2. Cobalt-black
3. Chromium oxide-green
4. Manganese dioxide-brown

✅ Correct Answer: 2

Which of the following is not a pozzolanic material?

1. Fly ash
2. Silica fume
3. Cinder
4. Slag

✅ Correct Answer: 3

Water proof cement is prepared by mixing ordinary cement with:

1. Resins
2. Water repellent chemicals
3. Sulpho-aminate
4. Metal stearates

✅ Correct Answer: 4

Ordinary Portland cement (OPC) has been classified into how many grades?

1. 2
2. 3
3. 10
4. 5

✅ Correct Answer: 2

Grade 43 OPC is used widely for:

1. High rise buildings
2. Plastering
3. House construction
4. Finishing works

✅ Correct Answer: 3

After how many days is the strength of cement is tested and graded according to the result?

1. 7 days
2. 28 days
3. 1 day
4. 14 days

✅ Correct Answer: 2

Grade 43 OPC shall be rejected if it remains in bulk storage in the factory for:

1. More than 3 months
2. More than 1 month
3. More than 6 months
4. More than 4 months

✅ Correct Answer: 3

The ratio of percentage of alumina to iron oxide in OPC 43 grade is:

1. 3.5
2. 0.66
3. 0.1
4. 0.05

✅ Correct Answer: 2

Which of the following cannot be added in 33 grade OPC after burning stage?

1. Gypsum
2. Water
3. Colouring Agents
4. Clay

✅ Correct Answer: 4

How much maximum percentage by mass of performance improvers can be added in grade 33 OPC?

1. 0.5
2. 1
3. 5
4. 0.1

✅ Correct Answer: 3

How many constituents are there in the brick earth?

1. 5
2. 4
3. 6
4. 8

✅ Correct Answer: 1

Which one of the below is the most important ingredient in the brick earth?

1. Alumina
2. Lime
3. Silica
4. Magnesia

✅ Correct Answer: 3

In what form should lime be present in the brick earth?

1. Paste
2. Lump
3. Clinker
4. Powder

✅ Correct Answer: 4

Excess of oxides of iron makes the brick:

1. Red in colour
2. Black in colour
3. Dark blue in colour
4. Yellow in colour

✅ Correct Answer: 3

What happens to raw bricks if an excess of alumina is present?

1. Becomes hard
2. Becomes brittle
3. Decay
4. Shrinkage

✅ Correct Answer: 4

What is the harmful effect of presents of alkali in brick earth on bricks?

1. Discolourises bricks
2. Efflorescence
3. Porous bricks
4. Flaking

✅ Correct Answer: 2

Why do bricks become brittle when excess silica is present?

1. Pores are created
2. Flaking occurs
3. Thermal stability is lost
4. Cohesion is lost

✅ Correct Answer: 4

Which of the following leads to the formation of small pores in brick?

1. Iron pyrites
2. Pebbles
3. Organic matter
4. Alkalis

✅ Correct Answer: 3

The presence of which of the below renders clay totally unsuitable for brick manufacture?

1. Kallar
2. Kankar
3. Hay
4. Lime

✅ Correct Answer: 1

How many types of the brick earth are there?

1. 3
2. 5
3. 2
4. 6

✅ Correct Answer: 1

Loamy, mild or sandy clay has __________ percentage of alkali?

1. 5%
2. 1%
3. 4%
4. 0%

✅ Correct Answer: 4

Which one of the below is the first step in the preparation of brick earth process?

1. Digging
2. Site selection
3. Cleaning
4. Unsoiling

✅ Correct Answer: 4

Why is the process of weathering performed?

1. To remove organic matter
2. To prepare for next process
3. To improve plasticity
4. To dry clay

✅ Correct Answer: 3

The process of kneading brick earth is called:

1. Pugging
2. Blending
3. Ramming
4. Tamping

✅ Correct Answer: 1

Which one of the following is not a part of pug mill?

1. Vertical shaft
2. Hub
3. Cutting blades
4. Timber base

✅ Correct Answer: 2

How many methods of moulding brick earth are there?

1. 3
2. 5
3. 2
4. 4

✅ Correct Answer: 3

The meaning of slop moulded bricks is:

1. Sand sprinkled inside mould
2. Insufficiently moulded bricks
3. Brittle and slimy bricks
4. Mould dipped in water

✅ Correct Answer: 4

Which is the most commonly employed drying method in India?

1. Hot floor drier
2. Tunnel drier
3. Natural drying
4. Blow drying

✅ Correct Answer: 3

Which of the following is not a chemical change that takes place in the brick earth during burning?

1. Dehydration
2. Vitrification
3. Oxidation
4. Reduction

✅ Correct Answer: 4

The depression provided in the face of a brick during its manufacturing is called:

1. Frog
2. Furrow
3. Groove
4. Scallop

✅ Correct Answer: 1

What is the recommended size of a brick?

1. 20x10x10cm
2. 20x9x9cm
3. 19x9x9cm
4. 19x8x8cm

✅ Correct Answer: 3

A good brick should not absorb more than what percent of water when soaked?

1. 15%
2. 20%
3. 30%
4. 10%

✅ Correct Answer: 1

Which of the following bricks is not preferred?

1. Sharp-edged
2. Clamp burned
3. Sound-proofed
4. Kiln burned

✅ Correct Answer: 2

Which of the below is used to sound proof bricks?

1. Gypsum
2. Terracotta
3. Plastics
4. Ceramic

✅ Correct Answer: 2

A good brick when dropped from the height of 1 metre can:

1. Shatter
2. Not break
3. Break into 2 halves
4. Develop small cracks

✅ Correct Answer: 2