Civil Engineering - UPSC Civil Service Exam Questions

31. 

Consider the following oxides :
1. Al2O3
2. CaO
3. SiO2
The correct sequence in increasing order of their percentage in an ordinary portland cement is

A. 2, 1, 3
B. 1, 3, 2
C. 3, 1, 2
D. 1, 2, 3

Answer: Option B

Explanation:

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32. 

The modules of elasticity (E) of concrete is given by

A. E = 1000 fck
B. E = 5700 fck
C. E = 5700 fck
D. E = 10, 000 fck

Answer: Option C

Explanation:

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33. 

A 6 hour storm has 6 cm of rainfall and the resulting runoff was 3 cm. If φ = index remains at the same value, which one of the following is the runoff due to 12 cm of rainfall in 9 hours in the catchment?

A. 4.5 cm
B. 6.0 cm
C. 7.5 cm
D. 9.0 cm

Answer: Option C

Explanation:

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34. 

In the plot of residual chlorine versus chlorine dose applied shown in the above figure, the curve will not have any (0, 0) point because

A. of experimental error
B. chlorine escapes into the atmosphere
C. chlorine requires some contact time
D. chlorine is consumed for disinfection

Answer: Option C

Explanation:

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35. 

Which of the following pairs regarding the defects in timber are correctly matched ?
1. Upsets....due to overmaturity and unventilated star age of wood.
2. Fwciness....due to crushing of fibres running transversel.
3. Star shakes....radial splits widest at the circumference and diminishing towards the centre.
4. Heart shakes....cracks widest at the centre and diminishing towards the outer circumference.
Select the correct answer using the codes given below.

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

Answer: Option C

Explanation:

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