## Concrete Technology MCQ Practice Questions (Civil Eng) Set 6

##### The dimensions of a 35 litre forma for measuring aggregates by volume, are:

Options are :

• Length 39 cm, breadth 25 cm, height 32 cm
• Length 30 cm, breadth 25 cm, height 30 cm
• Length 27 cm, breadth 27 cm, height 48 cm
• None of these
• Length 220 cm, breadth 25 cm, height 40 cm

##### Cement used for normal concrete construction, is obtained by burning a mixture of:

Options are :

• Silicious and argillaceous materials
• None of these
• Silicious, argillaceous and calcareous materials
• Argilaceous and calcareous materials
• Silicious and catcareous materials

Answer :Silicious, argillaceous and calcareous materials

##### Permissible compressive strength of M 200 concrete grade is:

Options are :

• 300 kg/cm^(2)
• 250 kg/cm^(2)
• 150 kg/cm^(2)
• 200 kg/cm^(2)
• 100 kg/cm^(2)

Options are :

• 2700 bags
• 2000 bags
• 2400 bags
• 2200 bags
• 3000 bags

##### A flaky aggregate is said to be elongated if its length is:

Options are :

• Four times the mean size
• Twice the mean size
• Equal to the mean size
• Five times the mean size
• Thrice the mean size

##### Pick up the correct statement from the following:

Options are :

• The concrete does not set at freezing point
• The concrete cured at a temperature below 23°C, gains strength up to 28 days
• The concrete gains strength due to hydration of cement
• The strength of concrete increases with its age
• All the above

##### For preparing ordinary concrete, the quantity of water used, is:

Options are :

• 5% by weight of aggregates plus 20% of weight of cement
• 30% by weight of aggregates plus 10% of weight of cement
• 10% by weight of aggregates plus 10% of weight of cement
• None of these
• 5% by weight of aggregates plus 30% of weight of cement

Answer :5% by weight of aggregates plus 30% of weight of cement

##### The strength and quality of concrete, depend upon:

Options are :

• All the above
• Shape of aggregates
• Surface texture of aggregates
• Surface area of aggregates

##### A concrete having a slump of 6.5 cm, is said to be:

Options are :

• Plastic
• Semi-plastic
• None of these
• Dry
• Earth moist

##### Setting time of cement increases by adding:

Options are :

• Sodium oxide
• None of these
• Hydrogen peroxide
• Calcium chloride
• Gypsum

##### Strength of concrete with passage of time:

Options are :

• Increases
• Remains constant
• Fluctuates
• Decreases

Options are :

• 16.5 mm
• 18.5 mm
• 22.5 mm
• 15.5 mm
• 13.5 mm

Options are :

• A
• C
• B
• E
• D

Options are :

• 45 m
• 25 m
• 15 m
• 35 m
• 10 m

##### According to IS : 382-1963, a good aggregate should be:

Options are :

• All the above
• Sufficiently strong
• Chemically inert
• Hard and durable

##### Log Angles machine is used to test the aggregate for:

Options are :

• Abrasion resistance
• None of these
• Impact value
• Crushing strength
• Water absorption

##### Concrete gains strength due to:

Options are :

• Evaporation of water from concrete
• Hydration of cement
• All the above
• Chemical reaction of cement with sand and coarse aggregates

##### Vicat apparatus is used for:

Options are :

• Consistency test
• Test for setting time
• Test for tensile strength
• None of these
• Fineness test

Options are :

• Bentonite
• Calcium chloride
• Fly ash
• All the above
• Hydrated lime

Options are :

• 8 kg
• 15 kg
• 14 kg
• 10 kg
• 12 kg

##### If fineness modulus of sand is 2.5, it is graded as:

Options are :

• Medium sand
• Very coarse sand
• Fine sand
• Very fine sand
• Coarse sand

##### Pick up the incorrect statement while performing preliminary test on concrete:

Options are :

• Concrete mix should be stored in air-tight containers
• Cement should be mixed by hand in order to maintain uniformity
• Proportions of the material and water should be the same as to be used at the work site
• concrete ingredients should be kept at a temperature of 37° ± 2°C
• None of these

Answer :concrete ingredients should be kept at a temperature of 37° ± 2°C

Options are :

• Zone IV
• Zone I
• Zone III
• Zone II

##### If P, Y and Z are the weights of cement, fine aggregates and coarse aggregates respetively and W/C is the water cement ratio, the minimum quantity of water to be added to first batch, is obtained by the equation:

Options are :

• 0.2P + 0.5Y + 0.1Z = W/C x P
• 0.3P + 0.1Y + 0.01Z = W/C x P
• 0.4P + 0.2Y + 0.01Z = W/C x P
• 0.5P + 0.3Y + 0.01Z = W/C x P
• 0.1P + 0.3Y + 0.1Z = W/C x P

Answer :0.3P + 0.1Y + 0.01Z = W/C x P

##### An ideal ware house, is provided:

Options are :

• 15 cm thick concrete floor laid on a dry course of soling
• Few windows which remain generally closed
• All the above
• Water proof roof
• Water proof masonry walls

Options are :

• 15%
• 20%
• 10%
• 12.5%
• 18.5%

Options are :

• 10 days
• 7 days
• 5 days
• 14 days
• 21 days

##### For the construction of thin R.C.C. structures, the type of cement to be avoided, is:

Options are :

• Low heat cement
• Ordinary Portland cement
• Rapid hardening cement
• Sulphate resisting cement
• Blast furnace slag cement

##### If aggregates completely pass through a sieve of size 75 mm and are retained on a sieve of size 60 mm, the particular aggregate will be flaky if its minimum dimension is less than:

Options are :

• None of these
• 40.5 mm
• 30.5 mm
• 20.5 mm
• 50.5 mm

##### Pick up the incorrect statement from the following:

Options are :

• None of these