The process of purifying water by spraying water on to a bed of stones where microorganism live so that the microorganisms feed on the pathogens in water and make the water free from harmful pathogens is called?

Related MCQs

• It has been demonstrated by the scientists that, certain wines such as Red Wine posses health benefits because they contain antioxidants, which work in the body as Free Radical Scavengers and slow the oxidation of other molecules by capturing the free radicals. Which among the following is the most common antioxidant found in Red Wine?
• Which among the following live tissues of the Human Eye does not have blood vessels?
• A piece of Ice was tied with a string to a water bucket‘s bottom, and the water bucket was filled with water with ice fully submerged in it. What would be the impact on the level of water when the ice melts away completely?
• To keep the hot glass item‘s finishing and transparency , they go through a process called annealing. This process involves _______?
• In which year India was certified as being free of variola (small pox virus) due to Indian national smallpox eradication programme (NSEP) and its intensified version (INSEP)?
• Which among the following elements are generally find in free state?
• The free electrons are in the __________?
• Consider the following: Pressurized heavy water reactor (PHWR) Fast breeder reactor (FBR) Advanced Heavy Water Reactor(AHWR) The above three represent the stages of India‘s three stage Nuclear Power programme as follows respectively?
• A treatment with which among the following plant hormones would prevent water loss from the plant leaves, by reducing transpiration, in times of low water availability?
• Which among the following compound of barium is used as radio contrast agent for X-ray imaging and other diagnostic procedures and also commonly called as Barium Food?