Q. For good design, the uniformity coefficient (Cᵤ) of the gravel material should preferably be ______

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Q. The efficiency of the centrifugal pumps commonly used for lifting water from wells may be of the order of _____________

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Q. A tube well is suitable when the subsoil formation is made up of _____________________

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Q. Bored tube wells in rocky consolidated formations as are encountered in the South Indian States of our country are usually drilled by _____________

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Q. Which of the following drilling method is unsuitable in loose formations such as unconsolidated sand and gravel or quicksand?

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Q. Which drilling method is best suited for underground formations made of gravel, sand and clayey deposits?

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Q. Which is the fastest method of drilling and especially useful in unconsolidated formations?

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Q. A household tube well is called Abyssinian tube well falls under _________

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Q. Duty of wells expressed in hectares the well can irrigate to bring a crop to maturity because of ___________

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Q. Which of the following strainer is used for shallow irrigation tube wells particularly in deltaic regions of developing countries?

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Q. Rewhiding the well involves ____________________

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Q. Which of the following is an effective method for the development of well?

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Q. The appropriate life of a tubewell in India is of the order of ______

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Q. Incrustation of the tubewell pipes may lead to _________________

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Q. Corrosion of tubewell pipes may cause _______________

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Q. Which of the following pump can effectively lift water under the maximum suction head of 6 to 8 meters?

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Q. The amount of water required from wells to mature a similar crop is more than that required in canal irrigation.

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Q. Which of the following gives an indication of the chemical quality of the groundwater?

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Q. Reversing the direction of flow by surging the well does help in removing the bridging.

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Q. Which of the following pumps is also used for testing or development of wells?

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