Civil engineer objective questions – Concrete Technology (Section-1)

1. The commonly used material in the manufacture of cement is

a) sand stone                                        

b) slate

c) lime stone                                         

d) graphite

2. To obtain cement dry powder, lime stones and shales their slurry, is burnt in a rotary kiln at a temperature between 

a) 1100°C and 1200°C                       

b) 1200°C and 1300°C

c) 1300°C and 1400°C                       

d) 1400°C and 1500°C

3. How much cement contained in one bag 

a) 5000 N                                            

b) 250 N

c) 500 N                                              

d) 300 N

4. The maximum quantity of ingredients present in cement production is

a) lime                                                

b) silica

c) alumina                                         

d) iron oxide

5. The minimum percentage of chemical ingredient of cement is 

a) alumuna                                       

b) iron oxide

c) silica                                              

d) lime

6. The minimum percentage of chemical ingredient of cement is that of

a) magnesium oxide                      

b) iron oxide

c) aluminium                                  

d) lime 

7. Pick up the correct proportions of chemical ingredients of cement

a) Lime: Silica: Alumina: Iron oxide: 63: 22: 6:3

b) Silica: Lime: Alumina: Iron oxide: 63: 22: 6:3

c) Alumina: Silica: Lime: Iron oxide: 63; 22: 6:3

d) Iron oxide: Alumina: Silica: Lime: 63: 22: 6:3

8. Pick up the correct statement from the following:

a) lime in excess, causes the cement to expand and disintegrate 

b) silica in excess, causes the cement to set slowly

c) alumina in excess, reduces the strength of the cement 

d) magnesium oxide in excess, remains in free state and makes the   cement unsound

e) all of the above

9. Efflorescence in cement is caused due to an excess of

a) alumina                                    

b) iron oxide

c) silica                                          

d) alkalis

10. An ordinary Portland cement when tested for its fineness, should not leave any residue on I.S sieve No 9 more than

a) 5%                                            

b) 10%

c) 15%                                          

d) 20%

11. Pick up the incorrect statement from the following:

a) gypsum in cement decreases the setting time

b) the first compound of cement which reacts with water, is aggregate.

c) bulking of sand is less when its particles are fine

d) all of the above

12. Cement used for normal concrete construction, is obtained by burning a mixture of

a) silicious and argillaceous materials  

b) argillaceous and calcareous materials

c) silicious and calcareous materials 

d) silicious, argillaceous and calcareous materials

13 The mixture of different ingredients of cement, is burnt at 

a) 1000°C                                       

b) 1200°C

c) 1400°C                                       

d) 1600°C

14. The cement whose strength is little lower than the ordinary cement during the first three months but attains afterwards the same strength, is known as

a) low-heat portland cement

b) rapid hardening portland cement

c) portland blast slag cement

d) portland pozzolana cement

15. For construction of structures in sea water, the cement generally preferred to, is

a) protland pozzolona cement

b) quick setting cement

c) low heat portland cement 

d) rapid hardening cement

16. For quality control of portland cement, the test essentially done is 

a) setting time                                     

b) soundness 

c) tensile strength                              

d) consistency 

e) all of the above

17. Sieve analysis of portlad cement is performed on IS sieve No. 

a) 3                                                       

b) 5

c) 7                                                       

d) 9

18. During manufacturing process of portland cement, gypsum or plaster of Paris is added 

a) to increase the strength of cement 

b) to modify the color of cement 

c) to adjust the setting time of cement  

d) to reduce heat of hydration

19. The percentage of gypsum added to the clinker during manufacturing process is 

a) 0.20                                                  

b) 0.25 to 0.35

c) 0.35 to 5.0                                       

d) 5 to 10

20. Addition of sugar in concrete results in 

a) increase in setting time by about 1 hour

b) increase in setting time by about 4 hours 

c) decrease in setting time by about 1 hour 

d) decrease in setting time by about 4 hour

21. Setting time of concrete decreases by adding 

a) gypsum                                         

b) hydrogen peroxide 

c) calcium chloride                          

d) sodium oxide

22. The minimum initial setting time of ordinary portland cement is 

a) 1 hr                                                

b) 2 hrs

c) 15 minutes                                   

d) 30 minutes 

23. Addition of pozzolana to ordinary portland cement, causes 

a) decrease in early strength  

b) reduction in chemical action with sulphates 

c) increase in shrinkage 

d) reduction in bleeding 

e) all of the above

24. Addition of pozzolana to cement 

a) decrease workability 

b) increase strength 

c) increase heat of hydration 

d) decrease curing time 

e) none of the above

25. Pozzolana cement is used with confidence for

a) dams                                                

b) massive foundation    

c) abutments                                      

d) R.C.C. structures

e) all of the above