Civil Engineering - UPSC Civil Service Exam Questions

26. 

An imaginary line passing through the optical centre of the objective and the optical centre of the eye-piece in the telescope of a surveying instrument is called the

A. horizontal axis
B. line of collimation
C. optical axis of the telescope
D. reference axis

Answer: Option B

Explanation:

No answer description available for this question. Let us discuss.

27. 

Which of the following air pollutants is/are responsible for photochemical smog ?
1. Oxides of nitrogen
2. Ozone
3. Unburnt hydrocarbons
4. Carbon monoxide
Select the correct answer from the codes given below :

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

Answer: Option D

Explanation:

No answer description available for this question. Let us discuss.

28. 

Consider the following statements :
Excess of sulphur in steel results in
1. red shortness
2. segregation
3. coldshortness.
Of these statements :

A. 1 alone is correct
B. 2 alone is correct
C. 2 and 3 are correct
D. 1 and 2 are correct

Answer: Option A

Explanation:

No answer description available for this question. Let us discuss.

29. 

Which one of the following pairs is not correctly matched ?

A. Declination : Horizontal angle between magnetic meridian & true meridian
B. Bowditch's rule : Employed to adjust closing error of a closed traverse
C. Deflection angle : Measured in case of open traverse instead of measuring included angle
D. Reconnaissance survey : Employed for detailed and precise survey

Answer: Option D

Explanation:

No answer description available for this question. Let us discuss.

30. 

Consider the following statements :
Some amount of chlorides is allowed in drinking water because
1. it helps in killing bacteria.
2. small quantity of chlorides adds to the taste
3. it is not injurious to human health.
4. it is not economical to remove it completely.
Which of these statements are correct ?

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

Answer: Option D

Explanation:

No answer description available for this question. Let us discuss.