Building Material Questions (BM5)

In this post I will share some important questions which are frequently asked in competitive examinations such as SSC, UPSC and state PSCs.



  1. How much lime is used to manufacture cement?


    1. 17 to 25 %
    2. 60 to 67 %
    3. 40 to 50 %
    4. 50 to 60 %

    View Answer
    Answer: b 60 to 67 %

  2. What is the average content of C3S in modern cement?


    1. 30 %
    2. 35 %
    3. 40 %
    4. 45 %

    View Answer
    Answer: d 45 %

  3. Which of the following are the most important compounds responsible for strength?


    1. C2S and C3S
    2. C3S and C3A
    3. C3A and C4AF
    4. C2S and C3A

    View Answer
    Answer: a C2S and C3S are the most important compounds responsible for strength. Together they constitute 70 to 80 % of cement.

  4. Which of the following is responsible for the early strength of cement?


    1. C2S
    2. C3S
    3. C3A
    4. C4AF

    View Answer
    Answer: b C3S is responsible for the 28-day strength of cement.

  5. Which of the following is responsible for the ultimate strength of cement?


    1. C2S
    2. C3S
    3. C3A
    4. C4AF

    View Answer
    Answer: a C2S is responsible for the ultimate strength of cement.

  6. Which of the following if added in high quantity will produce a high early strength cement?


    1. Lime
    2. Silica
    3. Alumina
    4. Alkalies

    View Answer
    Answer: c High content of Alumina and high ferric oxide if added, will produce high early strength cement.

  7. Which of the following is control by retarder?


    1. C2S
    2. C3S
    3. C3A
    4. C4AF

    View Answer
    Answer: b Retarders are added to control flash setting properties of C3A.

  8. Select the correct statement.


    1. The early heat of hydration is mainly contributed from the hydration of C3S.
    2. The fineness of cement influences the rate of development of heat but not the total heat.
    3. Both a and b
    4. Neither a nor b

    View Answer
    Answer: c Both statements are correct.

  9. How much water by percent of cement by weight is required for chemical reaction with portland cement compounds?


    1. 9 %
    2. 13 %.
    3. 23 %
    4. 38 %

    View Answer
    Answer: c 23 %

  10. Rapid Hardening Cement conforms to which code?


    1. IS 269
    2. IS 8112
    3. IS 12269
    4. IS 8041

    View Answer
    Answer: d IS 8041
    IS 269, 8112 and 12269 are for OPC 33, 43 and 53-grade respectively

  11. Rapid Hardening Cement is manufactured by


    1. by finer grinding
    2. by increasing C3S and decreasing C2S
    3. by increasing C2S and decreasing C3S

    Select the correct options.
    1. Only (i)
    2. Both (i) and (ii)
    3. Both (i) and (iii)
    4. Only (iii)

    View Answer
    Answer: b Rapid hardening cement is manufactured by higher grinding of cement (specific surface area not less than 3250 sq cm per gram) and higher C3S and lower C2S content.

  12. Extra Rapid Hardening cement should not be stored for more than?


    1. Half month
    2. One month
    3. One and a half month
    4. Two months

    View Answer
    Answer: b One month

  13. If the strength of rapid hardening cement is "x" after 7 days then that of extra rapid hardening cement after 7 days will be?


    1. x
    2. 1.05 x
    3. 1.15 x
    4. 1.25 x

    View Answer
    Answer: c 7-day strength of extra rapid hardening cement is 10 to 20 % higher than that of rapid hardening cement after 7 days.

  14. Which of the following cement should be used in sewage treatment works?


    1. Ordinary Portland Cement
    2. Low Heat Cement
    3. Sulphate Resisting Cement
    4. Rapid Hardening Cement

    View Answer
    Answer: c Sulphate Resisting Cement.

  15. Advantages of concrete made from Portland slag cement are


    1. Reduced heat of hydration
    2. Refinement of pore structure
    3. Reduced permeability
    4. Increased resistance to chemical attack

    Select the correct options.
    1. (i),(ii) and (iii)
    2. (i) and (ii)
    3. (i) and (iii)
    4. All are correct

    View Answer
    Answer: d All are correct

  16. Which cement is used to construct massive structures like a dam?


    1. OPC
    2. Rapid Hardening Cement
    3. Low Heat Cement
    4. Quick Setting Cement

    View Answer
    Answer: c Low heat cement is used to construct massive structures like dams because cement on hydration produces heat and in a massive structure, due to a large amount of concrete, the amount of the heat liberated will be much more and the temperature of the interior will increase and while cooling down it will form cracks in the concrete.

  17. Select correct state about Portland Pozzolana Cement.


    1. Less heat of hydration
    2. Resist attack of aggressive water
    3. Increases Leaching of calcium hydroxide
    4. Useful in marine and hydraulic construction

    1. (i) and (ii)
    2. (ii) and (iii)
    3. (i), (ii) and (iii)
    4. (i), (ii) and (iv)

    View Answer
    Answer: d

  18. What is the whiteness of white cement on Hunters scale?


    1. 60 %
    2. 70 %
    3. 80 %
    4. 90 %

    View Answer
    Answer: d It is generally 90 %.

  19. Whiteness of white cement as per IS code should be?


    1. greater than 60 %
    2. greater than 70 %
    3. greater than 80 %
    4. greater than 90 %

    View Answer
    Answer: b It should be greater than 70 %.

  20. How many parts of Sulphoaluminate are used in expansive cement per 100 parts of Portland Cement?


    1. 5
    2. 8 to 15
    3. 8 to 20
    4. 15

    View Answer
    Answer: c 8 to 20 parts are used.






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