Explore topic-wise InterviewSolutions in .

1. Domestic sewage contains water 

2. There are detergents and washing private vehicles. powders containing phosphate, which are used to soften the water. 

3. These chemicals are harmful to aquatic animals. 

4. They also contain disease. causing pathogenic bacteria and viruses. 

5. Hence, domestic sewage is harmful for originating from kitchen, bathrooms, toilet,

Green house effect

(a) Air pollution is the excessive concentration of foreign matter in the air which adversely affects the well-being of human beings, animals, plants and their environment. Air pollution is caused by addition of chemicals, carbon monoxide, sulphur dioxide, hydrogen sulphide by various factories, industrial plants. 

(b) Water pollution is caused by contamination of water by an alteration in physical, chemical, biological characteristics of water making it unsuitable for designated use in its natural state.

Natural Pollution : 

(a) Cosmic radiation from space and terrestrial radiation pollute the atmosphere.

 (b) It disturbs the natural atmosphere and harms human and animal life.

Anthropogenic Pollution :

(a) Man-made pollution is done by radioactive plants, atomic bombs, nuclear fuel etc. 

(b) It creates various diseases cancer, heart problems, migraine etc, it also disturbs animal life.

False. (Even if washing of soiled clothes is done in running water, it will cause pollution as the dirt and the waste materials will be added to water. This certainly will cause water pollution.)

Correct option is (b) (1) (2) (5) (7) (9) (10)

Correct option is (b) Algae

71% of earth surface is covered with Water. 

Pollutants are categorizes in mainly i.e. degradable and non- degradable pollutants, out of them non-degradable pollutants create the problem of pollution, e.g. glass, plastics, pesticides etc. On the basis of existence in nature, pollutants are divided into two categories: 

(i) Quantitative pollutants: These substances exist in nature but they act as pollutants when their concentration or quantity increases up to a critical level in the atmosphere, e.g., Carbon- dioxide, Nitrogen oxide, etc.

(ii) Qualitative pollutants: These pollutants do not exist in the environment They are introduced into the environment through man’s activities, e.g., pesticides (DDT), chemical fertilizers, herbicides etc.

Ammonia is the poisonous gas contained in the exhaust of a petrol driven vehicle.

Primary pollutants are directly mixed with atmosphere e.g. smoke, ash, fumes, dust, CO₂ Sulphur dioxide Methane, Benzene etc. Secondary pollutants are created by automobiles e.g. Nitrogen oxides, hydrocarbons etc, which are more toxic than their original elements.

(b) It decreases the oxygen levels produced

Biodegradable pollutants are degraded by microbial actions e.g. sewage, garbage etc, but non-biodegradable pollutants are not degraded e.g. glass, plastics etc.

011 spills are a source of pollution for Land and Air. 

Diarrhoea is not created by noise pollution.

Noise pollution is defined as an unwanted sound that is an irritant and a source of stress. Most of the noise originates from modem industrialized urban life. 

The main sources of noise pollution are : 

1. Industrial Sector 

2. Transport Sector 

3. Household sector 

4. Defense Sector 

5. Loud Speakers 

6. Miscellaneous Sources.

Noise pollution is done by extreme noise done by industrial sector, transport, loudspeakers etc., which adversely affect human health causing severe headache, migraine, mental disbalance, nervous breakdown, heart diseases.

80 Decibel (dB) is the limit of the noise when it can be said to be causing pollution.