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1561.

A recommended safe limit of land slope for efficient irrigation in heavy soil is:

A.	0.05 to 0.25 %	B.	0.20 to 0.40%
C.	0.25 to 0.65%	D.	All are correct

1562.

The relative proportion of sand, clay and silt determines:

A.	Soil structure	B.	Soil texture
C.	Soil mass	D.	Soil volume

1563.

The particle size of clay according to USWA is:

A.	0.002 mm	B.	<0.002 mm
C.	0.002 to 0.05 mm	D.	0.5 to 1.0 mm

1564.

The particle size of silt according to USWA is:

A.	>0.002 mm	B.	<0.002 mm
C.	0.002 to 0.05 mm	D.	0.25 to 0.5 mm

1565.

To particle size of gravel according to USWA is:

A.	0.5 to 1 mm	B.	1 to 2 mm
C.	<2 mm	D.	>2 mm

1566.

The porosity index of relative volume of pores is influenced by:

A.	Texture	B.	Structure
C.	Both (a) and (b)	D.	None of these

1567.

In case of porosity the volume of pores may change:

A.	With volume change of voids	B.	With volume change of solids
C.	Without volume change of solids	D.	All are correct

1568.

The porosity of sandy soil usually ranges from:

A.	30 to 35%	B.	35 to 50%
C.	40 to 60%	D.	50 to 60%

1569.

The porosity of clayey soil usually ranges from:

A.	30 to 35 %	B.	35 to 50%
C.	40 to 60%	D.	45 to 65%

1570.

The ratio of volume of pores to volume of solids is:

A.	Porosity	B.	Void ratio
C.	Particle density	D.	None of these