MCQ
The percentage of nitrogen is:
- A$21\%$
- ✓$78\%$
- C$12\%$
- D$87\%$
✓
Answer
Correct option: B.
$78\%$
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Select the option which correctly match the marked parts $P, Q, R$ and $S$ in the given figure with the functions given below.
→
|
$(i)$
|
Oxidation of food during cell respiration
|
|
$(ii)$
|
Storage and secretion of substances from the cell
|
|
$(iii)$
|
Allow minerals to pass through
|
|
$(iv)$
|
Transport of substances within cell.
|
Part of earth which supports the biodiversity is called.
The planet with a system of well$-$developed rings encircling it is:
→In the harvested crop the grain seed is separated from the chaff. This process id called $............$
→In which one of the following situations does a conventional electric current flow due north?
The distances between the various celestial objects are usually expressed in the unit of:
The place meant for conservation of biodiversity in their natural habitat are:
What is the main product of incomplete combustion of coal ?
Which of the following is usually not a water pollutant?
Force of friction depends on: