Table of Contents
Choose the correct options for the following questions.
Atmosphere absorbs:
Difficulty: Easy
A:
Ultraviolet rays
B:
Cosmic rays
C:
Harmful electromagnetic rays
D:
All of these
The gas essential for containing life is:
Difficulty: Easy
A:
$O_{2}$
B:
$CO_{2}$
C:
$N_{2}$
D:
Ar
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