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21.

Cropping methods in watershed areas are:

A.	Land consideration: Land is divided into small pieces of different owners	B.	Land classification: Should be done according to (i) Permeability (ii) Percentage of cover (iii) Type of vegetation cover
C.	Both (a) & (b)	D.	None of these

22.

Tillage Method: A farmer ploughs for purposes:

A.	Preparation of seed beds for established of plants	B.	To eliminate weed competition
C.	To replace soil layer by fresh layer soil	D.	All of the above

23.

Improvement techniques of arable lands are:

24.

Cropping systems are:

A.	Intercropping	B.	Strip cropping
C.	Rotation cropping	D.	All of the above

25.

Stream flow or discharges means:

A.	It is quantity of water flowing in the stream or channel	B.	Quantity, quality and timing of water yields are mostly affected by man
C.	Both (a) & (b)	D.	None of these

26.

Units of measures are:

A.	Cusecs: flow of cubic feet per second	B.	Cumecs: flow of cubic meter per second
C.	Acre feet: volume of water required to cover one acre to a depth of one feet	D.	All of the above

27.

Components of stream flow: Sources of flow to channel are:

A.	Channel interception or direct precipitation over the steam rain flow incident	B.	Surface run-off
C.	Sub-surface flow or inter-flow	D.	Base flow
E.	All of the above

28.

The types of stream flow are:

A.	Seasonal flow: It is produced in direct response to rainfall as steam lies above water table. The channel is called influent	B.	Intermittent flow: This flow is sustained for extended periods of time during rainy or snow melt season
C.	Both (a) & (b)	D.	None of these

29.

Hydrograph means:

A.	When discharge is plotted over time in minutes, hours	B.	Days resulting curve is known as hydrograph
C.	Both (a) & (b)	D.	None of these

30.

Measurement of discharge of water is depicted by:

A.	Q = AV	B.	A = Cross Sectional Area
C.	V = Velocity of Water	D.	All of the above