A dumpy level is set up with its eye-piece vertically over a peg A. The height f

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Question
A dumpy level is set up with its eye-piece vertically over a peg A. The height from the top of peg A to the centre of the eye-piece is 1.540 m and the reading on peg B is 0.705 m. The level is then setup over B. The height of the eye-piece above peg B is 1.490 m and a reading on A is 2.195 m. The difference in level between A and B is
Options
A. 2.900 m
B. 3.030 m
C. 0.770 m
D. 0.785 m
E. 1.770 m.

Correct Answer

0.770 m

Surveying problems

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2. Pick up the correct specification of Ramsden eyepiece from the following :
Options
A. it consists of two equal piano convex lenses
B. the curved surfaces of plano-convex lenses face each other
C. the two lenses are separated by a distance equal to 2/3 of the focal length of either lens.
D. the distance between the diaphragm and the front lens of the eyepiece is kept equal to 1/4 th of the focal length of a lens so that rays from a point on the diaphragm enter the eye as a parallel beam
E. all the above.

3. Cross hairs in surveying telescopes, are fitted
Options
A. in the objective glass
B. at the centre of the telescope
C. at the optical centre of the eye piece
D. in front of the eye piece.

8. Geodetic surveying is undertaken
Options
A. for production of accurate maps of wide areas
B. for developing the science of geodesy
C. making use of most accurate instruments and methods of observation
D. for determination of accurate positions on the earth's surface of system of control points
E. all the above.

9. In levelling operation
Options
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).

10. The conventional sign shown in below figure represents a
Options
A. bridge carrying railway below road
B. bridge carrying road below railway
C. bridge carrying road and railway at the same level
D. a level crossing.

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