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
None of these
Observation equation
Normal equation

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Surveying
Dumpy level is most suitable when

All of these
fly levelling is being done over long distance
the instrument is to be shifted frequently
many readings are to be taken from a single setting of the instrument

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Surveying
Accidental errors

All of these
Cannot be removed by applying corrections to the observed values
Are generally small
Do not follow any definite mathematical law

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