Which one of the following pairs (Instrument - Use) is NOT correctly matched?

Which one of the following pairs (Isoline - Meaning) is NOT correctly matched?

Which one of the following statements with regard to ozone is not correct?

Which one of the following is the usual unit of measurement for Air Pressure used in India?

Which of the following layer is not included in Homosphere?

Which of the following layers contains the ozone layer?