Free Environmental Issues (Daily Quiz: 1) NEET Biology Questions & Answers with Detailed Explanation & Full Review

Free Environmental Issues (Daily Quiz: 1) Time:

Question-1

Photochemical smog pollution does not contain

(a)

(b)

(c)

(d)

Explanation:

Answer: (d)

Photochemical smog is grey or yellow brown opaque smog having oxidising environment with little smoke. Photochemical smog contains secondary pollutants or photochemical oxidants. It was first reported over Los Angeles in 1940s. Photochemical smog is formed at high temperature over cities and towns due to still air, emission of nitrogen oxides and carbohydrates from automobile exhausts and solar energy. Nitrogen dioxides splits into nitric oxide and nascent oxygen. Nascent oxygen combines with molecular oxygen to form ozone. Ozone reacts with carbohydrates to form aldehydes and ketones. Nitrogen oxides, oxygen and ketones combine to form peroxy-acyl-nitrates (PAN). In areas with intense solar radiations, photoelectrical smog forms brown air.


Question-2

The loudness of a sound that a person can withstand without discomfort is about?

(a)

(b)

(c)

(d)

Explanation:

Answer: (d)

Relative loudness of sound ranges from 30 dB – 60 dB and above 60-80 dB is generally not hazardous, is not much uncomfortable. While prolonged exposure to noise level above 80 dB is painful and gradually leads to permanent loss off hearing ability or deafness. The permissible sound level in different areas is shown in the following table

Areas DayNight
Industrial 75 db70 dB
Commercial 65 dB55 dB
Residential55 dB45 dB
Silent50 dB40 dB


Question-3

According to Euro II norms, sulphur should be controlled at ________ in diesel and ________ in petrol.

(a)

(b)

(c)

(d)


Question-4

Which one of the following pairs of gases are the major cause of 'Greenhouse effect'?

(a)

(b)

(c)

(d)


Question-5

In coming years, skin related disorders will be more common due to

(a)

(b)

(c)

(d)


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