What is the role of ultraviolet (UV) radiation in the water purification systems? 1. It inactivates/kills the harmful microorganisms in water. 2. It removes all the undesirable odours from the water. 3. It quickens the sedimentation of solid particles, removes turbidity and improves the clarity of water. Which of the statements given above is/are correct?
A1 only
B2 and 3 only
C1 and 3 only
D1, 2 and 3
Answer & Solution
Correct answer: A. 1 only
UPSC CSE Prelims 2012 (GS-I, Set A), Q.13. Answer key: A (coaching consensus; UPSC did not publish an official 2012 AK separately on upsc.gov.in).
Related questions
Chandrayaan-3 (India's lunar mission) achieved a historic FIRST in 2023 by:The double-helix structure of DNA was discovered by:The 'powerhouse of the cell' that produces ATP for energy is:At room temperature, the only metal that exists in the LIQUID state is:The pH of a NEUTRAL solution (pure water at 25°C) is:In the modern periodic table, elements are arranged by:Standard Indian household electricity supply is:The refractive index of a medium is defined as: