A 30 m chain after measuring a distance of 6000 m was found to be 10 cm more than the designated length. If the chain was standardized before the commencement of survey than the true length is ............

A chain is made up mild steel or galvanized iron wire of diameter ............

The type of surveying which requires least office work is ............

During secular variation of magnetic meridian at different places ............

A deflection angle in a traverse is equal to the ............

The multiplying constant for the tacheometer is, generally, kept as ............

A tie line in a chain surveying ............

The rise and fall method ............

An internal focusing type surveying telescope, may be focused by the movement of ............