engineering recuitment DRDO CEPTAM STA B Tier I (Sr. Technical Assistant) Mock Test 2022 General Science Biology Ecology & Environment
The greenhouse effect in the Earth’s environment takes place because:
1
the polar ice caps are melting.
2
the atmosphere is transparent to IR at some wavelengths and opaque to IR at other wavelengths.
3
the atmosphere does not contain enough oxygen to block IR from the Sun.
4
the ozone hole is growing, letting in more and more IR.