Civil engineer objective questions – Structural Analysis and Design (Section-9)

1. The relation between modulus of rupture ( fcr ) and cube strength of concrete ( fck ) is

a ) fcr = 0.35 √fk

b ) fcr = 0.7 √fk

c ) fcr = 0.5 √fk

d ) fcr = 1.2 √fk

2. According to IS 1978 , the modulus of rupture in terms of characteristic strength of concrete is given by

a ) 1.2√√fck

b ) 1.25√√fck

c ) 1.30 √fck

d ) 0.7√fck

3. The relation between the split tensile strength ( fct ) and crushing strength ( fck ) for cube

a ) 1.2√√fck

b ) 1.25√√fck

c ) 1.30 √fck

d ) 0.7√fck

4. The young’s modulus of concrete Ec , is

a ) 1000 fck

b ) 5700 √fck

c ) 5700 fck

d ) 1000 √fck

5. Poisson’s ratio for concrete

a ) increase with richer

b) mix decreases richer mix

c ) remains constant

d ) increases with poor mix

6. Fineness modulus of fine aggregate is between

a ) 2-3.5

b ) 3.5-5.0

c ) 5-6.0

d ) 6-7.0

7. If the slump of concrete mix is 60 mm its workability is

a ) low

b ) medium

c ) high

d ) very high

8. Segregation is responsible for

a ) honeycomb concrete

b ) porous layers in concrete

c ) sand streaks in concrete

d ) all of the above

9. If the compaction factor is 0.95, the workability of concrete is

a ) very low

b ) low

c ) medium

d ) high

10. The grade of concrete not recommended by IS : 456 is

a ) M150

b ) M200

c ) M200

d ) M500

11. The durability of concrete is affected by

a ) cider

b ) vinegar

c ) alcohol

d ) both ( a ) and ( b ) above

12. M100 grade of concrete proportion

a ) 1 : 2 : 4 mix

b ) 1 : 3 : 4 mix

c ) 1 : 3 : 6 mix

d ) none of the above

13. Concrete gains strength due to

a ) chemical action of cement with coarse aggregate

b ) hydration of cement

c ) evaporation of water

d ) all of the above

14. Placing of concrete should preferably be done at a temperature of

a ) 10° c

b ) 20°c

c ) 27+-2°c

d ) 32°c

15. Inert material of cement concrete mix is

a ) water

b ) cement

c ) aggregate

d ) all of the above

16. The expansion joints are provided if the length of the concrete exceeds

a ) 20m

b ) 45m

c ) 60m

d ) 75m

17. The compressive strength of concrete determined from 150 mm x 150 mm cylinder as compared to that determined from 150 mm cube is

a ) more

b ) less

c ) equal

d ) none of the above

18. As the size of cube increases the strength of cube

a ) decreases

b ) increases with decreasing rate

c ) increases

d ) decreases with decreasing rate

19. Addition of sugar in concrete results in

a ) increase in setting time by about 4 hr

b ) increase in setting time by about 1 hr

c ) decrease in setting time by about 4 hr

d ) d ecrease in setting time by about 1 hr

20. Later stage strength of cement is caused by

a ) tricalcium silicate

b ) dicalcium silicate

c ) tricalcium aluminate

d ) gypsum aluminate

21. The initial and final setting times for ordinary portland cement are approximately related by

a ) T = 540 + t

b ) T = 270 + t

c ) T = 90 + 1.2t

d ) T = 90 + t

Where T & t are the final and initial setting times.

22. Unsoundness of cement due to magnesia can be determined by

a ) autoclave test

b ) vicat’s needle

c ) Le chatelier’s apparatus

d ) normal consistency

23. White cement is produced in

a ) flyash kiln

b ) coal kiln

c ) oil fired kiln

d ) electrical form kiln

24. The limit of ” loss on ignition ” for ordinary portland cement is

a ) 4 %

b ) 5 %

c ) 6 %

d ) 7 %

25. Slump test in concrete is used for

a ) workability

b ) viscosity

c ) strength

d ) all of the above

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"Structural Engineer" with over 5 years of experience in estimation, structural design, and surveying. I am passionate about using my skills to create safe and sustainable structures. I am also a keen writer, and I enjoy sharing my knowledge and experiences with others.