The expenses of a country for a particular year is given in a PIE chart. Read the PIE chart and answer the questions
Which is used as an air pollution indicator?
Choose the correct alternative. Since around 1970, with World population of 3.5 billion, they have doubled it to our current level of over 7 billion in 2012.
Bio-degradable wastes can usually be converted into useful substances with the help of:
The Chairperson of the 15th Finance Commission is: