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  • Question
  • A back sight


  • Options
  • A. is always taken on a point of known elevation or can be computed
  • B. is added to the known level to obtain the instrument height
  • C. taken on an inverted staff is treated as negative
  • D. all the above.

  • Correct Answer
  • all the above. 


  • Surveying problems


    Search Results


    • 1. Pick up the correct statement from the following :

    • Options
    • A. the power of a lens is the reciprocal of its focal length
    • B. the unit of power of the lens is diopter
    • C. the power of two or more thin lenses in contact is the power of the combination of the lenses
    • D. all the above.
    • Discuss
    • 2. The operation of making the algebraic sum of latitudes and departures of a closed traverse, each equal to zero, is known

    • Options
    • A. balancing the sights
    • B. balancing the departures
    • C. balancing the latitudes
    • D. balancing the traverse.
    • Discuss
    • 3. In optical reading instruments

    • Options
    • A. the vertical circle is usually continuous from 0° to 359°
    • B. the readings increase when the telescope is elevated in the face left position
    • C. the readings decrease when the telescope is elevated in the face right position
    • D. all the above.
    • Discuss
    • 4. The angle between two plane mirrors of optical square, is

    • Options
    • A. 20°
    • B. 30°
    • C. 45°
    • D. 60°
    • E. 90°.
    • Discuss
    • 5. When the bubble of the level tube of a level, remains central

    • Options
    • A. line of sight is horizontal
    • B. axis of the telescope is horizontal
    • C. line of collimation is horizontal
    • D. geometrical axis of the telescope is horizontal.
    • Discuss
    • 6. The diaphragm of a stadia theodolite is fitted with two additional

    • Options
    • A. horizontal hairs
    • B. vertical hairs
    • C. horizontal and two vertical hairs
    • D. none of these.
    • Discuss
    • 7. On a diagonal scale, it is possible to read up to

    • Options
    • A. one dimension
    • B. two dimensions
    • C. three dimensions
    • D. four dimensions.
    • Discuss
    • 8. 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.
    • Discuss
    • 9. 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.
    • Discuss
    • 10. The systematic errors which persist and have regular effects in the performance of a survey operation, are due to

    • Options
    • A. carelessness
    • B. faulty instrument
    • C. inattention
    • D. none of these.
    • Discuss


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