For the following questions answer them individually
The lines passing through points at which the magnetic declination is equal at a given time are called
The method of plane tabling commonly used for establishing the instrument stations only, is a
The ratio between the area of a crop irrigated and the quantity of water required during its entire period of the growth, is known as
The vertical wells provided along the banks of a river to draw ground water in dry season are called
The desirable limit of chloride content as per BIS standards in water for domestic supplies should not exceed
B-coli or E-coli are generally harmless organisms and their presence in water indicates the