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  • Question

  • While viewing through a level telescope and moving the eye slightly, a relative movement occurs between the image of the levelling staff and the cross hairs. The instrument is


  • Options
  • A. correctly focussed
  • B. not correctly focussed
  • C. said to have parallax
  • D. free from parallax.

  • Correct Answer
  • said to have parallax 

    • Surveying problems

    Search Results

    • 1. If R is the radius of the main curve, ? the angle of deflection, S the shift and L the length of the transition curve, then, total tangent length of the curve, is

    • Options
    • A. (R - S) tan ?/2 - L/2
    • B. (R + S) tan ?/2 - L/2
    • C. (R + S) tan ?/2 + L/2
    • D. (R - S) tan ?/2 + L/2
    • E. (R - S) cos ?/2 + L/2
      • Discuss
    • 2. If ? is the vertical angle of an inclined sight, ? is the angle of tilt of the staff, the error

    • Options
    • A.
    • B.
    • C.
    • D. none of these.
      • Discuss
    • 3. The real image of an object formed by the objective, must lie

    • Options
    • A. in the plane of cross hairs
    • B. at the centre of the telescope
    • C. at the optical centre of the eye-piece
    • D. anywhere inside the telescope.
      • Discuss
    • 4. The probable error of the adjusted bearing at the middle is

    • Options
    • A. rn
    • B. rn
    • C. rn
    • D. rn.
      • Discuss
    • 5. In chain surveying tie lines are primarily provided

    • Options
    • A. to check the accuracy of the survey
    • B. to take offsets for detail survey
    • C. to avoid long offsets from chain lines
    • D. to increase the number of chain lines.
      • Discuss
    • 6. Accuracy of 'fix' by two point problem, is

    • Options
    • A. bad
    • B. good
    • C. not reliable
    • D. unique.
      • Discuss
    • 7. One of the tacheometric constants is additive, the other constant, is

    • Options
    • A. subtractive constant
    • B. multiplying constant
    • C. dividing constant
    • D. indicative constant.
      • Discuss
    • 8. One of the Lehmann's rules of plane tabling, is

    • Options
    • A. location of the instrument station is always distant from each of the three rays from the known points in proportion to their distances
    • B. when looking in the direction of each of the given points, the instrument station will be on the right side of one and left side of the other ray
    • C. when the instrument station is outside the circumscribing circle its location is always on the opposite side of the ray to the most distant point as the inter-section of the other two rays
    • D. none of these.
      • Discuss
    • 9. Pick up the correct statement from the following :

    • Options
    • A. Box sextant is used for the measurement of horizontal angles
    • B. Cross staff is used for setting out right angles
    • C. Gradiometer is used for setting out any required gradient
    • D. Line ranger is used for locating intermediate stations on a survey line
    • E. All the above.
      • Discuss
    • 10. ABCD is a regular parallelogram plot of land whose angle BAD is 60°. If the bearing of the line AB is 30°, the bearing of CD, is

    • Options
    • A. 90°
    • B. 120°
    • C. 210°
    • D. 270°
      • Discuss

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