Explanations:Tube wells are a common method of extracting groundwater in many parts of India. They are particularly useful in areas where the water table is relatively high and the soil is conducive to drilling. However, the use of tube wells is not uniform across all states due to variations in geological and hydrological conditions.
Rajasthan, being a desert state, has a very low water table and a rocky terrain. The water table in Rajasthan is often too deep for tube wells to be effective, and the rocky nature of the soil makes drilling difficult and expensive. As a result, tube wells are not commonly used in Rajasthan. Instead, other methods such as open wells, step wells, and traditional water harvesting systems are more prevalent.
In contrast, states like Gujarat, Uttar Pradesh (UP), and Haryana have more favorable conditions for the use of tube wells. Gujarat has a mix of alluvial and hard rock aquifers, which support the use of tube wells for irrigation and other purposes. The state has a relatively higher water table, making it easier to extract groundwater. Similarly, UP and Haryana have high water tables and fertile alluvial soil, which are ideal for the use of tube wells. These states have a large number of tube wells used for agricultural and domestic purposes.
Therefore, the correct answer is that tube wells are not used in Rajasthan due to its low water table and rocky terrain, which make the use of tube wells impractical and economically unviable. This question tests the understanding of geographical and hydrological conditions that affect the use of tube wells in different regions of India.