Building Material Questions (BM6)

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



  1. Who has developed Magnesium Phosphate Cement?


    1. Indian Road Congress
    2. American Association of State Highway and Transportation Officials
    3. Central Road Research Institute, India
    4. None of the above

    View Answer
    Answer: c Central Road Research Institute, India

  2. At what temperature cement clinkers formed?


    1. $1350^\circ C$
    2. $1450^\circ C$
    3. $1550^\circ C$
    4. $1650^\circ C$

    View Answer
    Answer: b $1450^\circ C$

  3. When gypsum is added to cement?


    1. During Burning process
    2. During Grinding Process
    3. Either (a) or (b)
    4. None of the above

    View Answer
    Answer: b 3 to 4 % of gypsum is added to cement during the process to clinker grinding to retard the setting time of cement.

  4. Air permeability test for cement is done to find?


    1. Standard Consistency
    2. Fineness
    3. Setting Time
    4. Compressive Strength

    View Answer
    Answer: b Fineness of cement

  5. While performing the standard consistency test on cement, the procedure is repeated till the Vicat plunger penetrates the Vicat mould for a depth of _________.


    1. 30 to 35 mm from top
    2. 30 to 35 mm from bottom
    3. 33 to 35 mm from top
    4. 33 to 35 mm from bottom

    View Answer
    Answer: c 33 to 35 mm from top or 5 to 7 mm from bottom

  6. Before conducting the setting time test for cement, one should perform which of the following test?


    1. Standard Consistency Test
    2. Fineness Test
    3. Soundness Test
    4. Compressive Strength

    View Answer
    Answer: a Standard Consistency Test

  7. How much water is used to make cement paste to test setting time?


    1. 0.55 times the standard consistency
    2. 0.65 times the standard consistency
    3. 0.75 times the standard consistency
    4. 0.85 times the standard consistency

    View Answer
    Answer: d 0.85 times the standard consistency

  8. Gauging time for making cement paste for standard consistency test should not be more than?


    1. 2 minutes
    2. 5 minutes
    3. 8 minutes
    4. 10 minutes

    View Answer
    Answer: b 5 minutes

  9. What is the maximum final setting time for OPC 53 grade cement?


    1. 30 minutes
    2. 300 minutes
    3. 600 minutes
    4. 1000 minutes

    View Answer
    Answer: c 600 minutes

  10. What is the maximum final setting time for Low heat cement?


    1. 30 minutes
    2. 300 minutes
    3. 600 minutes
    4. 1000 minutes

    View Answer
    Answer: c 600 minutes

  11. What is the maximum final setting time for Masonry cement?


    1. 350 minutes
    2. 680 minutes
    3. 1050 minutes
    4. 1440 minutes

    View Answer
    Answer: d 1440 minutes

  12. What is the minimum 7 days compressive strength of OPC 43 grade cement?


    1. 22 MPa
    2. 33 MPa
    3. 37 Mpa
    4. 43 MPa

    View Answer
    Answer: b 33 MPa

  13. Why soundness test is performed on cement?


    1. To find the compressive strength
    2. To find if the cement contains an excessive amount of lime and magnesium
    3. To find the heat of hydration
    4. To find the chemical composition

    View Answer
    Answer: b To find if the cement contains an excessive amount of lime and magnesium

  14. Le-Chatelier Apparatus is used to find?


    1. Unsoundness by lime only
    2. Unsoundness by Magnesium only
    3. Both a and b
    4. None of the above

    View Answer
    Answer: a Le-Chatelier apparatus detects unsoundness due to lime only.

  15. The autoclave is used to find?


    1. Unsoundness by lime only
    2. Unsoundness by Magnesium only
    3. Both a and b
    4. None of the above

    View Answer
    Answer: c Autoclave is sensitive to both lime and magnesium.

  16. Maximum soundness by Le-Chatelier Apparatus for High Alumina Cement is?


    1. 5 mm
    2. 10 mm
    3. 15 mm
    4. 20 mm

    View Answer
    Answer: a 5 mm

  17. Maximum soundness by Autoclave for Rapid Hardening Cement is?


    1. 0.5 %
    2. 0.6 %
    3. 0.7 %
    4. 0.8 %

    View Answer
    Answer: d 0.8 %

  18. What is the size of the cement mortar cube used in compressive strength test?


    1. 70.4 mm
    2. 70.5 mm
    3. 70.6 mm
    4. 70.7 mm

    View Answer
    Answer: c Size of the cube is 70.6 mm

  19. How much water is added to make cement mortar cubes to be used in compressive strength test?


    1. P/4 + 3 % when standard sand is used
    2. P/4 + 3.5 % when standard sand is used
    3. P/4 + 3 % when ordinary sand is used
    4. P/4 + 3.5 % when ordinary sand is used
    Where P is the standard consistency of cement

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

    View Answer
    Answer: b P/4 + 3 % when standard sand is used and P/4 + 3.5 % when ordinary sand is used






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