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UPSC IES exam for the civil engineers 2016 with the solutions

1. Consider the following statements: 1.

1. There will be no defects in select grade timbers.

2. The codal values for strength of grade-II timber without defects may be reduced by

3. For timber used as columns, the permissible stress in ungraded timbers is adopted

4. In case of wind force and earthquakes, a modification factor of 1.33 is adopted.

Which of the above statements are correct?

(a) 1 and 3 only (b) 1 and 4 only

(c) 2 and 4 only (d) 2 and 3 only

Ans. (b)

Select grade is grade-I timber which is of highest quality and has no defects. Hence

1 is correct.

As per IS 1331 : 1971, the codal values for strength of grade-II timber without defects

may be reduced by 25%.

As per IS 883 : 1994, in case of wind force and earthquakes, a modification factor (Ks)

of 1.33 is adopted (refer table 5 IS 883 : 1994).

37.5%.

with a multiplying factor of 0.50.

2. Consider the following statements regarding timber: 2.

1. The strength of timber increases by Kiln seasoning.

2. Cutting of wood is to be done prior to treatment.

3. Water seasoning is good for prevention of warping.

4. ASCU treatment enhances the strength of wood.

Which of the above statements are correct?

(a) 1, 2 and 3 only (b) 2, 3 and 4 only

(c) 1, 3 and 4 only (d) 1, 2, 3 and 4

Ans. (a)

Application of AsCu solution increases the resistance of timber section against the

action of white ants and doesn’t alter the strength characteristics of timber.

3. Gase(s) emitted during rotting or decomposition of timber is/are mainly 3.

(a) Methane and Hydrogen (b) Hydrogen Sulphide

(c) Carbonic acid and Hydrogen (d) Ammonia

Ans. (c)

Rot in timber is decomposition or putrefaction, generally results due to dampness and which is followed by the emission of gases, mainly carbonic acid and hydrogen.

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