Tag: economics

Questions Related to economics

Pollution is mainly caused by:

economics environment pollution introduction to environmental pollution introduction to pollution environment and pollution

  1. increase in population and decrease in natural resources

  2. industrialisation

  3. urbanization and deforestation

  4. all the above

Show answer
Correct Option: D
Explanation:
  1. Population explosion ends up in over use of natural resources and hence pollutes the environment. For example higher population pollutes our water resources around us.
  2. industralisation ends up in the release of effluents into water bodies or spoiling land areas.
  3. Cutting down trees for fuel and burning end up in air pollution.
  4. Urbanisation after deforestation ends up in polluted atmosphere and deficit of fresh water for human use.

Chemical pollution is mainly due to the discharge of organic & inorganic substances released into the water.

Is the above statement correct?

economics environment pollution introduction to environmental pollution introduction to pollution environment and pollution

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

Most of the chemicals that pollute the environment (mainly water) are man-made, resulted from various activities. Toxic chemicals used for various purpose are thrown into water. Organic and inorganic pollutants are the main causes of chemical pollution. For example, many rivers and surface water bodies were contaminated by numerous waste streams from various chemical plants.

So, statement is true.

'Thermal pollution' means dumping heat in an ecological system, like a lake or a pond. Thermal power plants have to throw some heat into a 'sink' because of they:

economics environment pollution introduction to environmental pollution introduction to pollution environment and pollution

  1. get overheated

  2. have special anti-pollution laws

  3. follow the local sanitation laws

  4. follow the second natural law of thermodynamics

Show answer
Correct Option: A
Explanation:

Thermal pollution is the degradation of the quality of water due to a sudden change of its temperature. A primary source of thermal pollution is the discharge of heated water from the power plants. The unused heat, generally around $60$% of the input energy which is unable to be used in the process, is then returned to a sink, such as water.

An effective air-pollution control equipment is an attachment that electrically attracts pollutant particles in hot, escaping gases. It is known as:

economics environment pollution introduction to environmental pollution introduction to pollution environment and pollution

  1. an electric condenser

  2. a gas condenser

  3. an air purifier

  4. an electrostatic precipitator

Show answer
Correct Option: D
Explanation:

Electrostatic precipitator is a device that uses an electric charge to remove certain impurities such as solid particles liquid  from air and ether gases. It is particularly used to remove particles and power generating stations. 

State True or False.
Forest Fires and droughts are man made causes of deforestation.

economics environment pollution introduction to environmental pollution introduction to pollution environment and pollution

  1. True

  2. False

Show answer
Correct Option: B
Explanation:

Forest fires and droughts are caused naturally as man is not responsible for these. 

Phosphate pollution is caused by:

economics environment pollution introduction to environmental pollution introduction to pollution environment and pollution

  1. weathering of phosphate rocks only

  2. agriculatural fertilizers only

  3. phosphate rocks and sewage

  4. sewage and agricultural fertilizers

Show answer
Correct Option: D
Explanation:

Nitrates in water can cause severe illness in infants and domestic animals. Common sources of excess nitrate reaching lakes and streams include septic systems, animal feedlots, agricultural fertilizers, manure, industrial wastewaters, sanitary landfills, and garbage dumps. So D is the correct option. 

Modes of controlling pollution in large cities include :

economics environment pollution introduction to environmental pollution introduction to pollution environment and pollution

  1. less use of insecticides

  2. proper disposal of organic wastes, sewage and industrial effluents

  3. shifting of factories out of the residential area

  4. all of the above

Show answer
Correct Option: D
Explanation:

A person who is exposed to small amounts of insecticides over a long period of time can experience the effects of chronic poisoning and also pesticide spray can drift and pollute the air. Thus less use of insecticides should be done.

Also, proper disposal of organic waste, sewage, and industrial waste also reduce pollution.
Shifting large factories out of the residential area prevents less human contact with the pollution.
Hence, all options are the correct modes of controlling pollution in large cities.

State True or False.
Deforestation increases the chances of natural calamities 

economics environment pollution introduction to environmental pollution introduction to pollution environment and pollution

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

Deforestation increases the chances of natural calamities.
Deforestation means cutting down trees where it increases the chances of floods and droughts.
Note:
Deforestation may be caused naturally or there may be man made causes of deforestation.

Which of the following represents type(s) of environmental pollution

economics environment pollution introduction to environmental pollution introduction to pollution environment and pollution

  1. Air pollution

  2. water pollution

  3. soil pollution

  4. All of the above

Show answer
Correct Option: D
Explanation:

Air pollution, water pollution and soil pollution represents types of environmental pollution. The contamination of air, water and soil is the environmental pollution. Certain impurities are added to environment due to human activities such as burning coal, dumping waste in water, deforestation, burning of fuel etc.

We need fresh air for breathing. Some sources that cause pollution of air are mentioned here. Can you pick the false one?

economics environment pollution introduction to environmental pollution introduction to pollution environment and pollution

  1. Coal fires

  2. Heavy rain

  3. Volcanoes

  4. Forest fires

Show answer
Correct Option: B
Explanation:

Coal fires, volcanoes and forest fires causes air pollution due to release of many pollutants such as $CO _2$, whereas High-speed wind and dust storm cause pollution.