Question : How much percentage of oxygen is present in the atmosphere?

Option 1: 39%

Option 2: 79%

Option 3: 10%

Option 4: 21%

Question : The percentage of nitrogen present in ammonium sulphate is:

Option 1: 21%

Option 2: 25%

Option 3: 30.5%

Option 4: 18%

Question : Directions: Which of the following numbers will replace the question mark (?) in the given series?
67, 78, 71, 82, 75, 86, ?

Option 1: 97

Option 2: 92

Option 3: 84

Option 4: 79

Question : Nitrogen fixation is a process of

Option 1: assimilation of nitrate

Option 2: utilisation of nitrogen gas

Option 3: conversion of organic nitrogen to proteins

Option 4: conversion of molecular nitrogen to ammonia

Question : What is the correct percentage by volume of various gases in Earth's atmosphere?

Option 1: 20.95% nitrogen, 78.09% oxygen and 0.04% carbon dioxide and other greenhouse gases

Option 2: 10.95% nitrogen, 88.09% oxygen and 0.09% carbon dioxide and other greenhouse gases

Option 3: 10.95% nitrogen, 78.09% oxygen and 0.03% carbon dioxide and other greenhouse gases

Option 4: 78% nitrogen, 21% oxygen and 0.03% carbon dioxide and other greenhouse gases