451: Consider the following:
Carbon monoxide
Methane
Ozone
Sulphur dioxide
Which of the above are released into atmosphere due to the burning of crop/biomass residue?
(a) 1 and 2 only
(b) 2, 3 and 4 only
(c) 1 and 4 only
(d) 1, 2, 3 and 4
Explanation:
Explanation-Burning of crop residues emits traces of carbon dioxide, methane, carbon monoxide, nitrous oxide, sulphur dioxide and particulates which affect human health.
Punjab and Haryana are both responsible for causing air pollution due to burning. These two states contribute to 48 per cent of the total emission due to paddy burning across India.
Note: The majority of tropospheric ozone formation occurs when nitrogen oxides (NOx), carbon monoxide (CO) and volatile organic compounds (VOCs), such as xylene, react in the atmosphere in the presence of sunlight.
Source: http://www.isca.in/EARTH_SCI/Archive/v1/i1/4.ISCA-IRJES-2013-005.pdf
https://www.downtoearth.org.in/news/air/paddy-burning-ngt-orders-fine-imposition-on-erring-farmers-51698
454: Cobalt-60 is commonly used in radiation therapy because it emits
(a) alpha rays.
(b) beta rays.
(c) gamma rays.
(d) X-rays.
Explanation:
Cobalt-60 is commonly used in radiation therapy for the treatment of cancer because it emits gamma rays.