Environmental Science MCQ || Environmental Science solved Questions and Answers

46. Mass of living matter at a trophic level in an area at any given time is called

  1. Standing state
  2. Standing crop
  3. Humus
  4. Detritus

Answer.2. Standing crop

Explanation:

Mass of living matter at a trophic level in an area at any time is called standing crop. They are measured as the mass of living organisms in a particular area. The standing crop of each tropic level can simply be known as biomass.

 

47. Hydrarch succession takes place in

  1. Dry areas
  2. Bare area
  3. Wetter areas
  4. None of the above

Answer.3. Wetter areas

Explanation:

A hydrarch succession is a form of plant succession that starts out in shallow water and eventually culminates in a forest. Usually, these types of successions are most likely to begin on shallow ponds, lakes, and other water bodies.

Hydrarch succession occurs in wet areas or water and the successional series progress from hydric to mesic conditions. A hydrosere is a plant succession that occurs in an area of freshwaters such as in Oxbow lakes and Kettle lakes.

 

48. Which of the following is a fossil fuel?

  1. Oil
  2. Coal
  3. Natural gas
  4. All of the above

Answer.2. Coal

Explanation:

Fossil fuel is a hydrocarbon-containing material formed underground from the remains of dead plants and animals that humans extract and burn to release energy for use. The main fossil fuels are coal, petroleum, and natural gas, which humans extract through mining and drilling.

 

49. Which of the following is not an inexhaustible form of energy?

  1. Water
  2. Wind
  3. Solar
  4. Fossil

Answer.3. Solar

Explanation:

Inexhaustible resources of energy are those sources, which will not exhaust in the future. These are unlimited. Examples – Air, and sunlight. Solar energy is available in nature in an unlimited amount.

 

50. Biogas contains mainly

  1. Methane
  2. Propane
  3. Butane
  4. Carbon dioxide

Answer.1. Methane

Explanation:

Biogas consists mainly of methane and carbon dioxide. It can also include small amounts of hydrogen sulfide, siloxanes, and some moisture.

 

51. The burning of fossil fuels releases a large amount of

  1. Nitrogen into air
  2. Sulfur into air
  3. Carbon dioxide into the air
  4. Oxygen into air

Answer.3. Carbon dioxide into the air

Explanation:

When fossil fuels are burned, they release large amounts of carbon dioxide, a greenhouse gas, into the air. Greenhouse gases trap heat in our atmosphere, causing global warming.

 

52. A poisonous gas given out of vehicle exhaust is

  1. Methane
  2. Ethane
  3. Carbon dioxide
  4. Carbon monoxide

Answer.4. Carbon monoxide

Explanation:

Vehicle exhaust fumes can irritate the eyes and respiratory tract and are a risk to health by breathing in. Carbon-fuelled engine fumes contain carbon monoxide, a poisonous gas.

 

53. The purest form of coal is

  1. Anthracite
  2. Lignite
  3. Peat
  4. Bitumen

Answer.1. Anthracite

Explanation:

Anthracite is the purest form of coal, having the highest degree of coalification, the highest carbon count and energy content, and the fewest impurities. Anthracite contains nearly 95% of carbon and it’s the purest form of coal than any other option.

 

54. Which one of the following gas is used as a refrigerant?

  1. Freon
  2. Teflon
  3. Ethanol
  4. Benzol

Answer.1. Freon

Explanation:

Freon is a non-combustible gas that is used as a refrigerant in air conditioning applications. This freon undergoes an evaporation process over and over again to help produce cool air that can be circulated throughout your AC system.

 

55. Loss of forest has led to

  1. Erosion of fertile soil
  2. Global warming
  3. Loss of habitat of plants and animals
  4. All of the above

Answer.4. All of the above

Explanation:

Loss of forests has led to wide-reaching problems like soil erosion, fewer crops, flooding, water cycle disruption, greenhouse gas emissions, changes in climatic conditions, and loss of biodiversity.

 

56. What are the consequences of excessive mining in an area?

  1. Air and water pollution
  2. Deforestation
  3. Migration of large numbers of population
  4. All of the above

Answer.4. All of the above

Explanation:

Environmental effects of mining can occur at local, regional, and global scales through direct and indirect mining practices. The effects can result in

  1. Soil Erosion
  2. Sinkholes
  3. Loss of biodiversity
  4. Deforestation
  5. Migration of large numbers of population
  6. Contamination of soil
  7. Groundwater, and surface water by the chemicals emitted from mining processes.

 

57. Resources that are directly derived from nature are referred to as

  1. Organic resources
  2. Natural resources
  3. Manmade resources
  4. None of the above

Answer.2. Natural resources

Explanation:

Resources that are directly derived from nature are referred to as Natural resources.

Natural resources are naturally occurring materials that are useful to man or could be useful under conceivable technological, economic, or social circumstances or supplies drawn from the earth, supplies such as food, building and clothing materials, fertilizers, metals, water, and geothermal power.

 

58. Resources that take too long a period of time to be used as a resource are called as

  1. Renewable resource
  2. Non-renewable resource
  3. Exhaustible resource
  4. Inexhaustible resource

Answer.4. Inexhaustible resource

Explanation:

Resources that take too long a period of time to be used as a resource are called Inexhaustible resources.

An inexhaustible resource is a resource that never runs out or gets depleted. Some of such resources include wind, sun, solar energy, tides, and geothermal energy. They are mostly natural occurring resources hence they reappear naturally.

 

59. The fossil fuel that is derived from the dead remains of plants that grew some 250 million years ago is

  1. Petroleum
  2. Natural gas
  3. Coal
  4. LPG

Answer.1. 

Explanation:

Fossil fuels are combustible hydrocarbons formed millions of years ago from the dead decaying plants and animals buried under sediment.

Coal is called a fossil fuel because it is derived from the dead remains of plants that grew some 250 million years ago.

 

60. A resource that cannot be replaced in a reasonably short time is usually referred to as

  1. Renewable
  2. Non-renewable
  3. Natural
  4. Man-made

Answer.2. Non-renewable

Explanation:

A resource that cannot be replaced in a reasonably short time is usually referred to as Non-renewable energy.

Nonrenewable energy resources include coal, natural gas, oil, and nuclear energy. Once these resources are used up, they cannot be replaced, which is a major problem for humanity as we are currently dependent on them to supply most of our energy needs.

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