Pick up the correct statement from the following : Refraction correction is zero

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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

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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.

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.

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.

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.

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�

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