1. Low percentage of tricalcium silicate and high percentage of dicalcium silicate in cement salts in ?

rapid hardening

high early strength

high heat generation

none of these

Answer: none of these

Explanation:


2. In designing a ware-house, it is assumed that ?

each bag contains 50 kg of cement

floor area occupied by one bag of cement is 0.3 m²

height of each cement bag containing 35 litres of cement is 0.18 m

all of the above

Answer: all of the above

Explanation:


3. The chemical ingredient of cement which provides quick setting property to the cement is ?

lime

silica

alumina

iron oxide

Answer: alumina

Explanation:


4. According to Indian standard specifications for the compressive strength test of cement, the cement and standard sand mortar in the ratio of.................. is used ?

1:1

1:2

1:3

1:4

Answer: 1:1

Explanation:


5. For continuous transportation of concrete, the method used is ?

transport of concrete by pans

transport of concrete by wheel barrows

transport of concrete by belt concrete conveyors

transport of concrete by pumps

Answer: transport of concrete by belt concrete conveyors

Explanation:


6. The function of aggregates in concrete is to serve as ?

binding material

filler

catalyst

all of these

Answer: filler

Explanation:


7. The sound absorption coefficient of light weight concrete is nearly ........... than that of ordinary concrete ?

twice

three times

four times

six times

Answer: twice

Explanation:


8. The number of bags of cement required per cubic metre of 1:2:4 concrete will be approximately ?

2 to 3

3 to 4

4 to 5

5 to 6

Answer: 5 to 6

Explanation:


9. The breaking up of cohesion in a mass of concrete is called ?

workability

bleeding

segregation

creep

Answer: segregation

Explanation:


10. The removal of excess air after placing concrete helps in increasing the strength of concrete by ?

15 to 20%

20 to 30%

30 to 50%

50 to 70%

Answer: 15 to 20%

Explanation: