Civil Engineering - Surveying

21. 

The diaphragm of a stadia theodolite is fitted with two additional

A. horizontal hairs
B. vertical hairs
C. horizontal and two vertical hairs
D. none of these.

Answer: Option A

Explanation:

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22. 

Centering error of a theodolite produces an error

A. in all angles equally
B. which does not vary with the direction or pointing
C. which varies with the direction of pointing and inversely with the length of sight
D. none of these.

Answer: Option C

Explanation:

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23. 

In levelling operation

A. if second reading is more than first, it represents a rise
B. if first reading is more than second, it represents a rise
C. if first reading is less than second, it represents a fall
D. if second reading is less than first, it represents a fall
E. both (b) and (c).

Answer: Option E

Explanation:

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24. 

A tape of length l and weight W kg/m is suspended at its ends with a pull of P kg, the sag correction is

A.
B.
C.
D. .

Answer: Option A

Explanation:

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25. 

Pick up the correct statement from the following :

A. in astronomical telescope, the rays from the object after refraction at the objective are brought to a focus before entering the eyepiece to produce a real inverted image in front of the eye piece
B. in Galileo's telescope, the rays from the object get refracted at the objective and are intercepted by the eyepiece before a real image is formed
C. a line passing through the optical centre of the objective traversing through the eyepiece, is called line of sight
D. the line of sight which passes through the intersection of cross-lines marked on a diaphragm fixed in front of the eyepiece in a plane at right-angles to the axis, is called the line of collimation
E. all the above.

Answer: Option E

Explanation:

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