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  • Question
  • Pick up the correct statement from the following :


  • Options
  • A. Refraction correction is zero when the celestial body is in the zenith
  • B. Refraction correction is 33' when the celestial body is on the horizon
  • C. Refraction correction of celestial bodies depends upon their altitudes
  • D. all the above.

  • Correct Answer
  • all the above. 


  • Advanced Surveying problems


    Search Results


    • 1. The circle in which a plane tangent to the earth's surface at the point of observation, intersects the celestial sphere, is called

    • Options
    • A. visible horizon
    • B. sensible horizon
    • C. celestial horizon
    • D. true horizon
    • E. none of the above.
    • Discuss
    • 2. The hour angle of the heavenly body for Greenwich meridian equals the hour angle of the body for any other meridian + longitude :

    • Options
    • A. mean sun
    • B. true sun
    • C. vernal equinox
    • D. star
    • E. all the above.
    • Discuss
    • 3. The difference in longitude of two places expressed in time is equal to the difference in their

    • Options
    • A. sidereal time
    • B. apparent solar time
    • C. mean solar time
    • D. all the above.
    • Discuss
    • 4. Systematic errors

    • Options
    • A. always follow some definite mathematical law
    • B. can be removed by applying corrections to the observed values
    • C. either make the result too great or too small
    • D. are also known as cumulative errors
    • E. all the above.
    • Discuss
    • 5. The relation between the air base (B), photographic base (b), flying height (H) and the focal length (f) of a vertical photograph, is

    • Options
    • A.
    • B.
    • C.
    • D.
    • Discuss
    • 6. Invar tapes used for measuring base lines, is made of nickel-iron alloy containing nickel

    • Options
    • A. 24%
    • B. 36%
    • C. 40%
    • D. 60%.
    • Discuss
    • 7. The scale of a vertical photograph of focal length f taken from height of H metres above M.S.L., at a point of reduced level h, is

    • Options
    • A.
    • B.
    • C.
    • D.
    • Discuss
    • 8. The correction applied to the measured base of length L is

    • Options
    • A.
    • B. where w is the weight of tape/m
    • C. where h is height difference of end supports
    • D. Reduction to mean sea level =
    • E. all the above.
    • Discuss
    • 9. If the general ground level of any area is 10% of the flying height, the principal points may be used as the centres of radial directions for small scale mapping even in tilted photograph up to

    • Options
    • A. 1°
    • B. 2°
    • C. 3°
    • D. 4°
    • Discuss
    • 10. The elevation of the star at elongation is obtained by

    • Options
    • A. sin ? = sin ? cosec ?
    • B. sin ? = sin ? sec ?
    • C. sin ? = cos ? sec ?
    • D. sin ? = cos ? cosec ?.
    • Discuss


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