Design Of Concrete Structures MCQs

Option A: 24 to 48 hours

Option B: 3 days

Option C: 7 days

Option D: 14 days

Correct Answer: 24 to 48 hours ✔

Option A: ±5% of average

Option B: ± 10% of average

Option C: ± 15% of average

Option D: ±20% of average

Correct Answer: ± 15% of average ✔

Option A: 5%

Option B: 10%

Option C: 15%

Option D: 20%

Correct Answer: 10% ✔

Option A: 0.75-0.80

Option B: 0.80-0.85

Option C: 0.85 – 0.92

Option D: above 0.92

Correct Answer: above 0.92 ✔

Option A: 28 liters

Option B: 30 liters

Option C: 32 liters

Option D: 34 liters

Correct Answer: 32 liters ✔

Option A: M15

Option B: M20

Option C: M 10

Option D: M25

Correct Answer: M15 ✔

Option A: 0.35 d

Option B: 0.40 d

Option C: 0.45 d

Option D: dependent on grade of concrete also

Correct Answer: 0.40 d ✔

Option A: balanced beam

Option B: under-reinforced beam

Option C: over-reinforced beam

Option D: none of the above

Correct Answer: over-reinforced beam ✔

Option A: increasing the depth of beam

Option B: using thinner bars but more in number

Option C: using thicker bars but less in number

Option D: providing vertical stirrups

Correct Answer: using thinner bars but more in number ✔

Option A: less

Option B: more

Option C: equal

Option D: none of the above

Correct Answer: more ✔

Option A: 2.0 to 3.5

Option B: 3.5 to 5.0

Option C: 5.0 to 7.0

Option D: 6.0 to 8.5

Correct Answer: 2.0 to 3.5 ✔

Option A: steel and concrete are same

Option B: steel is lower than that for concrete

Option C: steel is higher than that for concrete

Option D: none of the above

Correct Answer: steel is lower than that for concrete ✔

Option A: remains constant

Option B: increases with richer mixes

Option C: decreases with richer mixes

Option D: none of the above

Correct Answer: increases with richer mixes ✔

Option A: affects only the early development of strength

Option B: affects only the ultimate strength

Option C: both (A. and (B.

Option D: does not affect the strength

Correct Answer: affects only the early development of strength ✔

Option A: 5%

Option B: 10 %

Option C: 15%

Option D: 20%

Correct Answer: 5% ✔

Option A: 2 %

Option B: 4%

Option C: 6%

Option D: 10%

Correct Answer: 4% ✔

Option A: higher initial setting time but lower final setting time

Option B: lower initial setting time but higher final setting time

Option C: higher initial and final setting times

Option D: lower initial and final setting times

Correct Answer: higher initial setting time but lower final setting time ✔

Option A: rounded

Option B: elongated

Option C: angular

Option D: all of the above

Correct Answer: rounded ✔

Option A: flexural tensile strength

Option B: direct tensile strength

Option C: compressive strength

Option D: split tensile strength

Correct Answer: flexural tensile strength ✔

Option A: 25%

Option B: 40%

Option C: 60%

Option D: 80%

Correct Answer: 40% ✔

Option A: 150 x150 x500 mm

Option B: 100 x100 x700 mm

Option C: 150 x150 x700 mm

Option D: 100 x100 x500 mm

Correct Answer: 150 x150 x700 mm ✔

Option A: segregation

Option B: bleeding

Option C: bulking

Option D: creep

Correct Answer: bleeding ✔

Option A: time of transit

Option B: ‘vater-cement ratio

Option C: the air in the mix

Option D: size of aggregate

Correct Answer: time of transit ✔

Option A: workability

Option B: strength

Option C: the effects of temperature variations

Option D: the unit weight

Correct Answer: workability ✔

Option A: 0.33

Option B: 0.5

Option C: 0.75

Option D: 1.0

Correct Answer: 0.5 ✔

Option A: fcr=0.35Vf7

Option B: fcr=0.57f7

Option C: fcr=0.7Vf7

Option D: fcr=1.2Vf7

Correct Answer: fcr=0.7Vf7 ✔

Option A: reduces the strength

Option B: increases the strength

Option C: does not change the strength

Option D: all of the above

Correct Answer: reduces the strength ✔

Option A: workability admixtures

Option B: accelerators

Option C: retarders

Option D: air entraining agents

Correct Answer: accelerators ✔

Option A: 10 to 15% more

Option B: 15 to 20% more

Option C: 20 to 25% more

Option D: 25 to 50% more

Correct Answer: 20 to 25% more ✔

Option A: gypsum

Option B: calcium chloride

Option C: sodium silicate

Option D: all of the above

Correct Answer: gypsum ✔

Option A: Ec = = 5700

Option B: Ec = = 570

Option C: Ec = = 5700fck

Option D: Ec = where fck N/mm2 = 700 is the characteristic strength in

Correct Answer: Ec = = 5700 ✔

Option A: reduces workability

Option B: increases bleeding

Option C: increases shrinkage

Option D: increases strength

Correct Answer: increases shrinkage ✔

Option A: increase in water-cement ratio

Option B: increase in fineness of cement

Option C: decrease in curing time

Option D: decrease in size of aggregate

Correct Answer: increase in fineness of cement ✔

Option A: tcr – rcs = tct

Option B: fcr>fcs>fc

Option C: fcr<fcs

Option D: fc5>fcr>fC

Correct Answer: fcr>fcs>fc ✔

Option A: aggregate cement ratio

Option B: time of transit

Option C: grading of the aggregate

Option D: all of above

Correct Answer: grading of the aggregate ✔

Option A: 0.003

Option B: 0.0003

Option C: 0.00003

Option D: 0.03

Correct Answer: 0.0003 ✔

Option A: segregation

Option B: compaction

Option C: shrinkage

Option D: bulking

Correct Answer: segregation ✔