Surveying
Dumpy level is most suitable when

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

ANSWER DOWNLOAD EXAMIANS APP

Surveying
Accidental errors

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

ANSWER DOWNLOAD EXAMIANS APP