Surveying
If ‘δ’ is the declination of the star and ‘φ’ is the latitude of the observer then the hour angle of the star at elongation is given by

cos H = tan φ . cot δ
sin H = tan φ . cot δ
tan H = tan φ . cot δ
None of these

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Surveying
Normal tension is that pull which

makes the correction due to pull equal to zero
is used at the time of standardising the tape
neutralizes the effect due to pull and sag
makes the correction due to sag equal to zero

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Surveying
The meridian of a place is

A semi-circle which passes through the place and is terminated at the poles
A great circle whose plane is perpendicular to the axis of rotation and it also passes through the place
An arc of the great circle which passes through the place and is perpendicular to the equator
A great circle passing through the place and the poles

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Surveying
Homologous points are

Corresponding points on the ground and photograph
Plumb points of stereo pair of photographs
Nodal points of the camera lens
Opposite corners of a photograph

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