Which of the below preservative, with their examples correctly match?(a) Type 1 –DDT(b) Type 2 – Coal(c) Type 3 – Boric acid(d) Type 4 – BenzeneThis question was addressed to me during an interview.I want to ask this question from Defects and Preservation of Timber topic in portion Materials for Construction of Basic Civil Engineering

Which of the below preservative, with their examples correctly match?(

1.	Which of the below preservative, with their examples correctly match?(a) Type 1 –DDT(b) Type 2 – Coal(c) Type 3 – Boric acid(d) Type 4 – BenzeneThis question was addressed to me during an interview.I want to ask this question from Defects and Preservation of Timber topic in portion Materials for Construction of Basic Civil Engineering
Answer» The correct ANSWER is (c) Type 3 – BORIC acid The explanation: There are only 3 TYPES of preservative as per IS 401.Type 1 is oil type and coal, tar are examples of it. Type 2 is an ORGANIC solvent type with benzene, DDT as examples.Type 3 is water BORNE type and boric acid, zinc chloride are examples of it.

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