Environmental Science - Study Mode

[#266] Most of the radiation emitted by a human body is in the form of:
Correct Answer

(C) Infrared radiation and is invisible

Explanation

Solution: Most of the radiation emitted by the human body is mainly at the wavelength of 12 micron. The wavelength of infrared radiation is between 0.75 to 1000 micron (1 micron = 10 -6 metres). Hence , the majority of radiation emitted by human bodies lie in the infrared region.

[#267] Solar radiation reaches the earth's surface as:
Correct Answer

Visible radiation only

Explanation

Solution: Solar radiation reaches the earth's surface as ultraviolet, visible, and infrared radiation.

[#268] The earth's atmospheric window is in the:
Correct Answer

(C) Infrared region

Explanation

Solution: The earth's atmospheric window is in the infrared region.

[#269] Carbon monoxide is a pollutant because it
Correct Answer

(B) reacts with haemoglobin

Explanation

Solution: Carbon monoxide is a pollutant because it reacts with haemoglobin.

[#270] High biological oxygen demand indicates:
Correct Answer

(C) intense level of microbial pollution

Explanation

Solution: BOD indicates the amount of putrescible organic matter present in water. Therefore, a low BOD is an indicator of good quality water, while a high BOD indicates polluted water. Dissolved oxygen (DO) is consumed by bacteria when large amounts of organic matter from sewage or other discharges are present in the water.