Building Material Questions (BM4)

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



  1. The lime containing 5 to 30% of alumina and silica with some iron oxide is known as _________


    1. Quick Lime
    2. Fat Lime
    3. Hydrated Lime
    4. Hydraulic Lime

    View Answer
    Answer: d Hydraulic Lime

  2. The lime which has the highest content of calcium oxide is called _______


    1. Rich Lime
    2. Fat Lime
    3. White Lime
    4. All of the above

    View Answer
    Answer: d ALl of the above

  3. Calcination of limestone is done above a temperature of?


    1. $700^{\circ } C$
    2. $500^{\circ } C$
    3. $900^{\circ } C$
    4. $800^{\circ } C$

    View Answer
    Answer: c $900^{circ }C$

  4. In which of the following process quicklime or rich lime is treated with water?


    1. Calcination of lime
    2. Slaking of lime
    3. Both a and b
    4. Neither a nor b

    View Answer
    Answer: b When quicklime or rich lime is treated with as much as water it readily absorbs, a chemical reaction takes place. The lime thus, cracks, swells and ultimately turns into bulky powder. It is also associated with a hissing noise, cracking sound and evolution of heat and steam. This process is called slaking of lime.

  5. Select the correct statement.


    1. The white powdery product obtained by slaking of quicklime is called slaked lime.
    2. A thin pourable suspension of slaked lime in water is called milk of lime.
    3. A plastic mass of lime which results from the slaked lime in the presence of sufficient quantity of water is called putty.
    4. All are correct

    View Answer
    Answer: d All the given statements are correct.

  6. To impart hydraulic properties, the quantity of Magnesium carbonate in lime should not be more than?


    1. 5%
    2. 8%
    3. 10%
    4. 15%

    View Answer
    Answer: a Lime containing not more than 5 % of magnesium carbonate gives better results and imparts hydraulic properties to the lime.

  7. Eminently Hydraulic Lime contains Clay


    1. 5 to 10 %
    2. 10 to 20 %
    3. 20 to 30 %
    4. 30 to 40 %

    View Answer
    Answer: c Lime containing clay 20 to 30% produces eminently hydraulic lime.

  8. Which of the following lime sets underwater at a moderate speed?


    1. Class A
    2. Class B
    3. Class C
    4. Class D

    View Answer
    Answer: b Class B lime (Semi-Hydraulic lime) sets underwater at a moderate speed.

  9. What should be added to Fat Lime to give it hydraulic property?


    1. Silica
    2. Gypsum
    3. Surkhi
    4. Water

    View Answer
    Answer: c When fat lime is mixed with surkhi, it attains hydraulic property and can be used as mortar.

  10. Which of the following lime does not contains clay impurity?


    1. Eminently Hydraulic Lime
    2. Semi-Hydraulic Lime
    3. Fat Lime
    4. Kankar Lime

    View Answer
    Answer: c Fat lime does not contain any clay impurity.

  11. Which of the following lime is used to make mortar?


    1. Hydraulic Lime
    2. Kankar Lime
    3. Fat Lime
    4. Magnesium Lime

    View Answer
    Answer: a Hydraulic Lime is used to make mortar.

  12. What is the initial setting time of eminently hydraulic lime?


    1. Half an hour
    2. One hour
    3. Two hour
    4. Three hour

    View Answer
    Answer: c Two Hour

  13. If the colour of the lime is dirty white, it means the lime maybe?


    1. Hydraulic Lime
    2. Kankar Lime
    3. Fat Lime
    4. Magnesium Lime

    View Answer
    Answer: a Dirty white colour lime may posses hydraulic properties i.e., the lime may be hydraulic lime.

  14. If the colour of the lime is pure white, it means the lime is?


    1. Hydraulic Lime
    2. Kankar Lime
    3. Fat Lime
    4. Magnesium Lime

    View Answer
    Answer: c Pure white colour lime is Fat lime or Rich lime.

  15. After performing the hydrochloric acid test on lime, following result are obtained.


    1. If there is a gel formation and it is so thick that it does not flow even when the tube is turned upside down, it indicates class B lime.
    2. If there is a gel formation and it is not thick and tends to flow when the tube is tilted, the lime is class A lime.
    3. If there is no get formation, the lime is class C lime.

    Which of the following statement is correct?
    1. Only (i)
    2. Both (i) and (ii)
    3. Only (iii)
    4. All are correct

    View Answer
    Answer: c
    If there is a gel formation and it is so thick that it does not flow even when the tube is turned upside down, it indicates class A lime (Eminently Hydraulic Lime).
    If there is a gel formation and it is not thick and tends to flow when the tube is tilted, the lime is class B lime (Semi-hydraulic lime).
    If there is no get formation, the lime is class C lime (Fat Lime).

  16. How much coal is required for burning one cubic metre of limestone?


    1. 0.5 to 0.8 cubic metre
    2. 0.13 to 0.15 cubic metre
    3. 0.25 to 0.30 cubic metre
    4. 0.20 to 0.40 cubic metre

    View Answer
    Answer: c 0.25 to 0.30 cubic metre is required for burning one cubic metre of limestone.

  17. Select the correct statement.


    1. Cinder is a waste product obtained from the burning of steam coal.
    2. Cinder is a pozzolanic material.
    3. Cinder is a weak fuel.
    4. All are correct.

    View Answer
    Answer: d All are correct.






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