• ( 1 ) High strength concrete is used in prestressed member

    • 1) to overcome high bearing stresses developed at the ends
    • 2) to ovecome bursting stresses at the ends
    • 3) to provide high bond stresses
    • 4) to overcome cracks due to shrinkage
    • Discussion in forum
      Answer : 5) all the above.
      Solution : High strength concrete is used in prestressed member to overcome high bearing stresses developed at the ends, provide high bond stresses and over come cracks due to shrinkage.








      discussion


      Answer : 5) all the above.

    • ( 2 ) Segregation in concrete results in

    • 1) honey combing
    • 2) surface scaling
    • 3) porous layers
    • 4) all of these
    • Discussion in forum
      Answer : 4) all of these
      Solution :








      discussion


      Answer : 4) all of these

    • ( 3 ) The breaking up of cohesion in a mass of concrete is called

    • 1) workability
    • 2) bleeding
    • 3) segregation
    • 4) creep
    • Discussion in forum
      Answer : 3) segregation
      Solution : The breaking up of cohesion in a mass of concrete is called segregation








      discussion


      Answer : 3) segregation

    • ( 4 ) Ferro-concrete is another name given to

    • 1) plain cement concrete
    • 2) reinforced cement concrete
    • 3) prestressed cement concrete
    • 4) none of these
    • Discussion in forum
      Answer : 2) reinforced cement concrete
      Solution : Ferrocement originated in the 1840s in France and is the origin of reinforced concrete.








      discussion


      Answer : 2) reinforced cement concrete

    • ( 5 ) The type of lime used in lime concrete is

    • 1) fat lime
    • 2) slaked lime
    • 3) poor lime
    • 4) hydraulic lime
    • Discussion in forum
      Answer : 4) hydraulic lime
      Solution : The type of lime used in lime concrete is hydraulic lime








      discussion


      Answer : 4) hydraulic lime

    • ( 6 ) The cement concrete, from which entrained air and excess water are removed after placing it in position, is called

    • 1) vacuum concrete
    • 2) light weight concrete
    • 3) prestressed concrete
    • 4) sawdust concrete
    • Discussion in forum
      Answer : 1) vacuum concrete
      Solution : The cement concrete, from which entrained air and excess water are removed after placing it in position, is called vacuum concrete.








      discussion


      Answer : 1) vacuum concrete

    • ( 7 ) In order to provide colour, hardness and strength to the cement, the ingredient used is

    • 1) lime
    • 2) silica
    • 3) alumina
    • 4) iron oxide
    • Discussion in forum
      Answer : 4) iron oxide
      Solution : Iron oxide (Fe203): This ingredient imparts color, hardness and strength to the cement.Cement has 0.5%-6% iron oxide of its mass








      discussion


      Answer : 4) iron oxide

    • ( 8 ) The degree of grinding of cement is called

    • 1) fineness
    • 2) soundness
    • 3) impact value
    • 4) bulking
    • Discussion in forum
      Answer : 1) fineness
      Solution : Cement is in the form of powder, which is obtained by grinding the various raw materials after calcimining. The grinding produces finer particles of cement. The degree to which the cement is ground to smaller and smaller particles is called fineness of cement








      discussion


      Answer : 1) fineness

    • ( 9 ) "Colocrete" is the commercial term for

    • 1) high alumina cement
    • 2) coloured cement
    • 3) low heat cement
    • 4) rapid hardening cement
    • Discussion in forum
      Answer : 2) coloured cement
      Solution : "Colocrete" is the commercial term for coloured cement








      discussion


      Answer : 2) coloured cement

    • ( 10 ) The resistance of an aggregate to the effect of hydration of cement and weather is called

    • 1) crushing value
    • 2) impact value
    • 3) abrasion value
    • 4) soundness
    • Discussion in forum
      Answer : 4) soundness
      Solution : The resistance of an aggregate to the effect of hydration of cement and weather is called soundness.








      discussion


      Answer : 4) soundness





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