Q.1

After casting, an ordinary cement concrete on drying

  • expands
  • mix
  • shrinks
  • none of these.
Q.2

Pozzolana cement is used with confidence for construction of

  • dams
  • massive foundations
  • abutments
  • R.C.C. structures
  • all the above.
Q.3

Internal friction between the ingredients of concrete, is decreased by using

  • less water
  • fine aggregates
  • rich mix
  • more water and coarse aggregates
  • none of these.
Q.4

Non-uniform compaction may cause the concrete

  • porous
  • non-homogeneous
  • reduced strength
  • all the above.
Q.5

For ensuring quality of concrete, use

  • single sized aggegates
  • two sized aggregate
  • graded aggregates
  • coarse aggregates.
Q.6

The process of proper and accurate measurement of concrete ingredients for uniformity of proportion, is known

  • grading
  • curing
  • mixing
  • batching
  • none of these.
Q.7

Vicat's apparatus is used for

  • fineness test
  • consistency test
  • setting time test
  • soundness test
  • compressive strength test.
Q.8

Workability improved by adding

  • air-entraining agent
  • foaming agent
  • oily-agent
  • aluminium compound
  • all the above.
Q.9

Pick up the correct statement from the following:

  • High percentage of C3S and low percentage of C2S cause rapid hardening
  • High percentage of C3S and low percentage of C2S make the cement less resistive to chemical attack
  • Low percentage of C3S and high percentage of C2S contribute to slow hardening
  • Low percentage of C3S and high percentage of C2S provide greater resistance to chemical attack
  • All the above.
Q.10

Sands of zone I are

  • coarse
  • medium
  • medium to fine
  • fine.
Q.11

To hydrate 500kg of cement full water needed, is

  • 100 kg
  • 110 kg
  • 120 kg
  • 130 kg
  • 140 kg
Q.12

Permissible compressive strength of Mconcrete grade is

  • 100 kg/cm2
  • 150 kg/cm2
  • 200 kg/cm2
  • 250 kg/cm2
  • 300 kg/cm2
Q.13

The following proportion of the ingredients of concrete mix, is not in conformation to arbitrary method of proportioning

  • 1 : 1 : 2
  • 1 : 2 : 4
  • 1 : 3 : 6
  • 1 : 2 : 8
  • 1 : 4 : 10
Q.14

Pick up the correct statement from the following:

  • Water enables chemical reaction to take place with cement
  • Water lubricates the mixture of gravel, sand and cement
  • Only a small quantity of water is required for hydration of cement
  • Strength of concrete structure largely depends upon its workability
  • All the above.
Q.15

Slump test is done for

  • clay
  • sand
  • lime
  • concrete.
Q.16

While designing an air entrained concrete

  • water cement ratio is reduced
  • proportion of aggregates is reduced
  • an allowance for the entrained air is made
  • strength of the concrete, is reduced
  • all the above.
Q.17

Proper proportioning of concrete, ensures

  • desired strength and workability
  • desired durability
  • water tightness of the structure
  • resistance to water
  • all the above.
Q.18

Hydration of cement is due to chemical action of water with

  • Tricalcium silicate and dicalcium silicate
  • Dicalcium silicate and tricalcium aluminate
  • Tricalcium aluminate and tricalcium alumino ferrite
  • All the above.
Q.19

Water cement ratio is

  • volume of water to that of cement
  • weight of water to that of cement
  • weight of concrete to that of water
  • volume of concrete to that of water
  • both (a) and (b) of the above.
Q.20

For road pavements, the cement generally used, is

  • ordinary Portland cement
  • rapid hardening cement
  • low heat cement
  • blast furnace slag cement
  • none of these.
Q.21

Log Angles machine is used to test the aggregate for

  • crushing strength
  • impact value
  • abrasion resistance
  • water absorption
  • none of these.
Q.22

According to I.S. :the number of grades of concrete mixes, is

  • 3
  • 4
  • 5
  • 6
  • 7
Q.23

Pick up the correct statement from the following:

  • Insufficient quantity of water makes the concrete mix harsh
  • Insufficient quantity of water makes the concrete unworkable
  • Excess quantity of water makes the concrete segregated
  • Excess quantity of water causes bleeding in concrete
  • All the above.
Q.24

Mgrade of concrete approximates

  • 1 : 3 : 6 mix
  • 1 : 1 :2 mix
  • 1 : 2 : 4 mix
  • 1 : 1.5 : 3 mix
  • none of these.
Q.25

The commonly used material in the manufacture of cement is

  • sand stone
  • slate
  • lime stone
  • graphite.
Q.26

The lower water cement ratio in concrete, introduces

  • smaller creep and shrinkage
  • greater density and smaller permeability
  • improved frost resistance
  • greater wear resistance and improved bond strength
  • all the above.
Q.27

Separation of water or water sand cement from a freshly concrete, is known

  • bleeding
  • creeping
  • segregation
  • flooding
  • none of these.
Q.28

To obtain a very high strength concrete, use very fine grained

  • Granite
  • Magnetite
  • Barite
  • Volcanic scoria.
Q.29

For preparing a test-specimen, it is necessary

  • to mix cement and fine aggregate by dry hand
  • to mix coarse aggregates
  • to mix water to the cement, fine aggregates and coarse aggregates
  • to oil inner surface of the mould and the base plate, before placing concrete
  • all the above.
Q.30

The increased cohesiveness of concrete, makes it

  • less liable to segregation
  • more liable to segregation
  • more liable to bleeding
  • more liable for surface scaling in frosty weather
  • none of these.
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