The magnetic bearing of a line is 32° and the magnetic declination is 10°15'W. The true bearing is ............

Which of the following errors can be eliminated by taking mean of both face observations?

A disadvantage of plane table survey is ............

It is more difficult to obtain good results while measuring horizontal distance by stepping ............

An open cross-staff is commonly used for setting out ............

Which of the following error is not eliminated by the method of repetition of horizontal angle measurement?

Anallatic lens is provided ............

Normal tension is that pull which ............

In case of double line river, contours are ............