What percentage of the earths atmosphere does O2 compri - Practice (English) | ObjectiveMcq

Loading practice questions

A focused practice platform for competitive-exam MCQs, subject wise, topic wise practice, and current affairs revision.

Exams

SSC CGL
UPSC CSE PRELIMS
IBPS PO
RRB NTPC
CDS

Subjects

Mathematics
Physics
General Knowledge
English
Reasoning

Resources

Current Affairs
Search MCQs
Practice Sets

Company

About Us
Contact
Privacy Policy
Terms of Use
Disclaimer
Copyright

Practice library for exams, subjects, and daily revision. For learning purposes only.

© 2026 ObjectiveMcq.ComAll rights reserved

What percentage of the earths atmosphere does O2 compri - Practice (English) | ObjectiveMcq

PracticeGeneral ScienceEarth ScienceWhat percentage of the earths atmos...

Earth Science General ScienceEasy

818 views

What percentage of the earths atmosphere does $O_2$ comprise?

Correct Answer:

(B) 21%

Explanation:

21%

Related Practice

If we dont drink water, we will eventually
Which of the following voices is likely to have a minimum frequency?
Sound can travel through?
Which of the following is not matched correctly?
Micro-organisms act upon the dead plants to produce
Water absorption through roots can be increased by keeping the plants
Range of Nuclear forces is
Which of the following pairs will give displacement reactions?