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Surveying

Surveying
In a spherical triangle ABC, right angled at C, sin b equals

tan a cot A
cos a sin A
sin a cos A
cot A tan a

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Surveying
The equation which is obtained by multiplying each equation by the coefficient of its unknowns and by adding the equations thus formed, is known as

Conditional equation
Observation equation
Normal equation
None of these

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Surveying
α and β are the angles subtended by a point of elevation h at their air station with respective plumb points. Photo scale and focal length of the lens being ‘S’ and ‘f’ respectively. Parallax displacement of the point due to relief, is

h (tan α - tan β)/S
h tan α/S
h (tan α + tan β)/S
h tan β/S

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

True horizon
Visible horizon
Sensible horizon
Celestial horizon

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Surveying
A star is said to elongate

When the star
When the angle at the star of the spherical triangle is 90°
When the star momentarily moves vertically
All of these

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Surveying
The angle between the axis of earth and the vertical at the station of observation is called

Astronomical co-latitude
Astronomical latitude
Declination of star
Co-declination of star

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