Concrete Technology And Design Set 4 MCQs

Q1 | If the effective plan area of a warehouse is 54 sq. m, and maximum height of piles permitted is 270cm, the number of cement bags to be stored, is

2000 bags

2200 bags

2400 bags

2700 bags

Q2 | The property of fresh concrete, in which the water in the mix tends to rise to the surface whileplacing and compacting, is called

segregation

bleeding

bulking

creep

Q3 | Workability of concrete for a given water content is good if the aggregates, are

rounded aggregate

irregular aggregate

angular aggregate

flaky aggregates

Q4 | For preparing ordinary concrete, the quantity of water used, is

5% by weight of aggregates plus 20% of weight of cement

10% by weight of aggregates plus 10% of weight of cement

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

30% by weight of aggregates plus 10% of weight of cement

Q5 | Finer grinding of cement

affects only the early development of strength

affects only the ultimate strength

both (a) and (b)

does not affect the strength

Q6 | The light weight aggregates are obtained from

sedimentary rocks

metamorphic rocks

igneous rocks

volcanic source

Q7 | The aggregate impact value of the aggregate used in

building concrete is less than 45

road pavement concrete is less than 30

runway concrete is less than 30

all the above

Q8 | For walls, columns and vertical faces of all structural members, the form work is generallyremoved after

24 to 48 hours

3 days

7 days

14 days

Q9 | Efflorescence in cement is caused due to an excess of

alumina

iron oxide

silica

alkalis

Q10 | For given workability the grading requiring the least amount of water is one that gives

greatest surface area for the given cement and aggregates

least surface area for the given cement and aggregates

least weight for the given cement and aggregates

greatest weight for the given cement and aggregates

Q11 | Minimum pitch of transverse reinforcement in a column is

the least lateral dimension of the member

sixteen times the smallest diameter of longitudinal reinforcement bar to be tied

forty-eight times the diameter of transverse reinforcement

lesser of the above three values

Q12 | Pick up the incorrect statement applicable to the field test of good cement.

when one thrusts one\s hand into a bag of cement, one should feel warm

the colour of the cement is bluish

by rubbing cement in between fingers, one should feed rough

all the above

Q13 | An aggregate is known as cyclopean aggregate if its size is more than

4.75 mm

30 mm

60 mm

75 mm

Q14 | Workability of concrete mix with low water cement ratio is determined by

tensile strength test

slump test

compaction factor test

flexural strength test

Q15 | The effect of creep on modular ratio is

to decrease it

to increase it

either to decrease or to increase it

to keep it unchanged

Q16 | The type of aggregates not suitable for high strength concrete and for pavements subjected totension, is

rounded aggregate

irregular aggregate

angular aggregate

flaky aggregate

Q17 | The maximum percentage of chemical ingredient of cement is that of

magnesium oxide

iron oxide

silica

lime

Q18 | The commercial name of white and coloured cement in India, is

colorcrete

silvicrete

snowcem

all the above

Q19 | An excess of flaky particles in concrete aggregates

decreases the workability

increases the quantity of water and sand

more than 15% are not desirable

all the above

Q20 | Increase in the moisture content in concrete

reduces the strength

increases the strength

does not change the strength

all of the above

Q21 | The 28 days cube strength of mass concrete using aggregates of maximum size 5 cm for gravitydams should be

between 150 to 300 kg/cm2

between 350 to 600 kg/cm2

between 150 to 500 kg/cm2

below 200 kg/cm2

Q22 | Select the incorrect statement

lean mixes bleed more as compared to rich ones.

bleeding can be minimized by adding pozzolana finer aggregate

bleeding can be increased by addition \of calcium chloride

none of the above

Q23 | Permissible compressive strength of M 150 concrete grade is

100 kg/cm2

150 kg/cm2

200 kg/cm2

250 kg/cm2

Q24 | Cement used for normal concrete construction, is obtained by burning a mixture of

siliceous and argillaceous materials

argillaceous and calcareous materials

siliceous and calcareous materials

siliceous, argillaceous and calcareous materials

Q25 | As compared to ordinary Portland cement, high alumina cement has

higher initial setting time but lower final setting time

lower initial setting time but higher final setting time

higher initial and final setting times

lower initial and final setting times