1. The test conducted in the laboratory on the specimen made out of trial ?

preliminary test

slump test

works test

none of these

Answer: preliminary test

Explanation:


2. The sum of percentages of all deleterious materials in the aggregate shall not exceed ?

5%

10%

15%

20%

Answer: 5%

Explanation:


3. The maximum particle size of coarse aggregate is ?

45 mm

55 mm

65 mm

75 mm

Answer: 75 mm

Explanation:


4. Vicat's apparatus is used to perform ?

fineness test

soundness test

consistency test

compressive strength test

Answer: consistency test

Explanation:


5. The preliminary test should be repeated if the difference of compressive strength of three test specimens exceeds ?

0.5 N/mm²

1 N/mm²

1.5 N/mm²

2 N/mm²

Answer: 1.5 N/mm²

Explanation:


6. The object of curing is to ?

prevent the loss of water by evaporation

reduce the shrinkage of concrete

preserve the properties of concrete

all of these

Answer: all of these

Explanation:


7. For batching 1: 2: 4 concrete mix by volume, the ingredients required per bag of cement are ?

50 kg of cement: 70 kg of fine aggregate: 140 kg of coarse aggregate

50 kg of cement : 70 litres of fine aggregate: 140 litres of coarse aggregate

50 kg of cement: 100 kg of fine aggregate: 200 kg of coarse aggregate

50 kg of cement: 100 litres of fine aggregate: 140 litres of coarse aggregate

Answer: 50 kg of cement : 70 litres of fine aggregate: 140 litres of coarse aggregate

Explanation:


8. In voids method of determining the quantity of cement paste, it is assumed ?

voids in the coarse aggregate are filled by the fine aggregates

volume of fine aggregates required for 1 m' of coarse aggregate is equal to total voids in coarse aggregate plus 10% aggregate extra to allow for additional voids created by wedging action

volume of cement paste required for 1 m' of coarse aggregate is equal to total volume of voids in the fine aggregate plus 15% aggregate extra to allow for additional voids created by wedging action

all of the above

Answer: all of the above

Explanation:


9. The object of compaction is to ?

eradicate air holes

give maximum density

ensure intimate contact between the concrete and the surface of reinforcement

all of the above

Answer: all of the above

Explanation:


10. Vertical sides of columns may be stripped after ?

1 to 2 days

7 days

14 days

21 days

Answer: 1 to 2 days

Explanation: