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111.

The infertility of the soil in water-logged areas is due to

A.	inhibiting activity of the soil bacteria	B.	growth of weeds
C.	increasing of harmful salts	D.	all of these

112.

Water logging is caused due to

A.	inadequate drainage facilities	B.	over irrigation
C.	presence of impermeable strata	D.	all of these

113.

The soil becomes, practically, infertile if its p-H value is

A.	0	B.	7
C.	11	D.	14

114.

Intensity of irrigation should be increased in order to prevent the area from water logging.

Yes

115.

The measure adopted to reclaim the water-logged area is

A.	installation of lift irrigation schemes	B.	lining of canals
C.	lowering the full supply level	D.	all of these

116.

Water logging takes place due to

rise

fall

117.

Which of the following statements is wrong?

A.	Seepage drains reduce the chances of water logging.	B.	The water table generally follows the ground surface above it with a few exceptions.
C.	At the water table, the hydrostatic pressure is zero.	D.	Water logging makes the land more productive.

118.

The most economical section of a lined canal is

A.	rectangular section with circular bottom for small discharges	B.	triangular section with circular bottom for small discharges
C.	trapezoidal section with rounded corners for higher discharges	D.	none of the above
E.	both (b) and (c)

119.

Lining of a canal is necessary

A.	to minimise the seepage lossses in canal	B.	to prevent erosion of bed and sides due to high velocities
C.	to increase the discharge in canal section by increasing the velocity	D.	all of the above

120.

Lining of a canal

A.	increases	B.	decreases
C.	does not effect