Q. The plant roots act as a semi-permeable membrane.

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Q. Which is the least harmful salt for agricultural soil?

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Q. Which among the following salt is also called black alkali?

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Q. How many cubic metres of water will be removed for this particular period of a system designed to use a D.C of 1.5 cm draining 20 hectares for a capacity of 5 days?

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Q. Which type of alternate layouts system for tile drainage has two mains?

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Q. What is the size of the tile at an outlet of a 12 hectare drainage system, if the D.C is 2 cm and the tile grade is 0.5%. Assume the rugosity coefficient as 0.015 for the tile drain material.

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Q. What structure is surrounded around the tile drains when used in less pervious strata?

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Q. Under what strata the tile drainage should not be placed?

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Q. In what chemical ways does tile drainage help in plant growth?

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Q. Which type of soils is benefited by using tile drainage?

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Q. Tile drainage helps to reduce soil erosion.

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Q. How can tile drainage help to increase crop yields?

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Q. For maximum productivity of crops both surface and sub-surface drains are sometimes needed.

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Q. Which type of drains is used for small quantity of waters removal?

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Q. In surface inlet what is provided to deal with trash?

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Q. What structure is constructed to carry back into the underground?

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Q. Which type of open drains would be fully operative only in rainy season?

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Q. What is the cross sectional shape of shallow surface drains?

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Q. Shallow surface drains are connected to outlet drains.

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Q. What is the name given to the drains used in depressions?

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