393.  Which one of the following statements regarding levelling is correct ?
A. If second reading is less than the first, there is a rise.
B. If second reading is greater than the first, there is a fall.
C. If second reading is equal to the first, the two stations are at same level.
D. All the above.

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394.  The following technical terms are generally used in levelling :1. Change point2. Intermediate staff reading3. Back staff reading4. Forward staff readingTheir correct sequence is as under:
A. 1,2,3,4
B.2,3,4,1
C.3,2,4,1
D.4,1,2,3

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395.  Pick up the correct formula for the probable error per kilometre in ordinary levelling due to :
A. reading = ? 1.6 mm
B. displacement = ? 7.5 mm
C. combined effect of reading and displacement = ? 7.7 mm
D. all the above.

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396.  The mean of two vertical angles taken on two faces of a theodolite is the true verticala angle
A. provided the altitude bubble is brought to the centre.
B. even if the altitude bubble is nor brought central.
C. even if the altitude bubble remains either right or left of the central position during both forces savals.
D. None of the above.

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397.  Pick up the incorrect statement from the following :
A. The lines joining number of stations chosen to fulfil the demands of the survey is called traverse lines.
B. If the lines form a polygon, then a closed traverse is obtained.
C. A traverse run between two triangulation or traverse station, is called an open traverse.
D. None of the above.

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398.  The whole circle bearing are measured :
A. Clockwise from south, from 0? to 360?
B. Clockwise from north, from 00 to 360?
C. Anti-clockwise from north, from O'r to 3600
D. Anti-clockwise from south, from 00 to 360?

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399.  Weisbach triangle is generally used
A. for .establishing sewer lines
B. for establishing a connection of surface and underground lines
C. for computation of astronomical data
D. for hydrographical surveys.

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