Building Material Questions (BM 10)

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



  1. Which of the following is a deciduous tree?


    1. Deodar
    2. Chir
    3. Teak
    4. Canes

    View Answer
    Answer: c
    Deodar and chir are conifers

  2. Which of the following is incorrect about exogenous trees?


    1. They have successive annual rings
    2. They grow inward
    3. A variety of exogenous trees shed their leaves while the other does not
    4. None of the above

    View Answer
    Answer: b
    Exogenous trees grow outward.

  3. Which of the following tree has a natural resistance to the attack of white ants?


    1. Teak
    2. Babul
    3. Chir
    4. Mango

    View Answer
    Answer: a

  4. Which of the following pairs has one conifer and one deciduous tree?


    1. Pine and Deodar
    2. Sal and Teak
    3. Shishum and Mahogany
    4. Kail and Babul

    View Answer
    Answer: d

  5. The part of the log of a timber inside the bark which contains living cells is called _____.


    1. Pith
    2. Sapwood
    3. Cambium Layer
    4. Heartwood

    View Answer
    Answer: b

  6. The thin fibrous tissues which extend radially from cambium layer towards the pith is called ______.


    1. Medullary rays
    2. Annual rings
    3. Either (a) and (b)
    4. None of the above

    View Answer
    Answer: a
    Annual rings are approximately concentric innumerable rings in the log of a timber.

  7. Which of the following indicates the age of the timber?


    1. Number of medullary rays
    2. Number of Annual rings
    3. The thickness of the sapwood
    4. The thickness of the heartwood

    View Answer
    Answer: b
    Just by counting the number of the annual rings one can know the age of a log of timber in years.

  8. Which of the following sawing methods produces minimum wastage?


    1. Ordinary sawing
    2. Tangential sawing
    3. Quarter sawing
    4. Radial sawing

    View Answer
    Answer: a

  9. Which of the following radial sawing methods produces maximum waste?




    1. a
    2. b
    3. c
    4. d

    View Answer
    Answer: a

  10. In the method of tangential sawing ...


    1. Sawing is done tangentially to medullary rays
    2. Sawing is done tangentially to annual rings
    3. Sawing is done parallel to medullary rings
    4. None of the above

    View Answer
    Answer: b

  11. A piece of timber whose thickness is less than 5 cm and width is more than 5 cm is called ...


    1. Batten
    2. Board
    3. Plank
    4. Strip

    View Answer
    Answer: c
    The dimensions of a Batten does not exceed 5 cm either in width or in thickness.
    A board has a thickness of less than 5 cm and width 10 cm or more.
    A strip has a  cannot thickness of less than 5 cm and width less than 10 cm.

  12. Seasoning of timbers is done ...


    1. To improve strength
    2. To reduce sap
    3. To reduce weight
    4. To fix the dimensions

    View Answer
    Answer: b

  13. Why air seasoning is not recommended?


    1. It is a very slow process
    2. It requires a large area
    3. With this method, the moisture content can not be reduced less than 15 to 18 %.
    4. All of the above

    View Answer
    Answer: d

  14. What is the range of moisture content of timber used as structural elements?


    1. 5 to 12%
    2. 12 to 20%
    3. 10 to 16%
    4. 10 to 20%

    View Answer
    Answer: b
    As per IS 883, Table-2, for structural elements the range of moisture content is 12 to 20% and for doors and windows it is 10 to 16%.





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