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Multiple choice commercial applications management of natural resources unequal distribution of resources protecting our environment rules are for everyone

Percentage of methane present in biogas is

  1. 75%

  2. 60%

  3. 50%

  4. 43 - 45%
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Biogas refers to a mixture of different gases produced by the breakdown of organic matter in the absence of oxygen. Biogas can be produced from raw materials such as agricultural waste, manure, municipal waste, plant material, sewage, green waste or food waste. Biogas is a renewable energy source. In biogas approximately 60% of methane is present.
So, the correct answer is '60%'
Multiple choice commercial applications management of natural resources unequal distribution of resources protecting our environment rules are for everyone

Source of energy which does not evolve CO$ _2$ is

  1. Coal

  2. Oil

  3. Organic compounds

  4. Nuclear energy
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

coal, oil & organic compounds contain carbon as the main constituent thus they can evolve carbon dioxide, while nuclear energy will release no carbon dioxide.

So, the correct answer is 'Nuclear energy'

Multiple choice commercial applications management of natural resources unequal distribution of resources protecting our environment rules are for everyone

The incorrect statement regarding biogas is

  1. It predominantly contains methane

  2. Production involves anaerobic digestion of organic wastes

  3. Dung can be used for generation of biogas

  4. It does not contain hydrogen sulphide
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Biogas is a type of fuel. It is a mixture of different gases produced when organic matter breaks down in the absence of oxygen. The organic wastes release many gases primarily methane and carbon-dioxide. It is produced by anaerobic fermentation. It is counted as eco-friendly gas.

So, the correct option is 'It does not contain hydrogen sulphide'.

Multiple choice commercial applications management of natural resources unequal distribution of resources protecting our environment rules are for everyone

A biogas plant works to its maximum capacity when

  1. Conditions are aerobic and sewage is supplied
  2. Conditions are anaerobic and temperature $40^oC$
  3. Conditions are aerobic and temperature $40^oC$

  4. Conditions are anaerobic and sewage is supplied
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Biogas refers to a mixture of different gases produced by the breakdown of organic matter in the absence of oxygen. Biogas is produced by anaerobic digestion with methanogen or anaerobic organisms, which digest material inside a closed system or fermentation of biodegradable materials. There are two key processes: mesophilic and thermophilic digestion which is dependent on temperature. Research in biogas production indicates that the optimal temperature for mesophilic bacteria is around 37°C and around 55°C for thermophilic bacteria.


So, the correct answer is 'Conditions are anaerobic and temperature 40C'.

Multiple choice commercial applications management of natural resources unequal distribution of resources protecting our environment rules are for everyone

Electricity is a natural resource.

  1. True

  2. False

  3. Nither

  4. Either
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

 Electricity in its natural form is from lightening. Various natural resources like wind (wind mills), water (turbines), fossil fuels are used to produce electricity. Therefore, electricity is a product obtained using natural resource and its since natural form cannot be easily harnessed  so cannot be nither classified as a natural resource nor a man made product.

So, the correct answer is 'Nither'

Multiple choice commercial applications management of natural resources unequal distribution of resources protecting our environment rules are for everyone

According to the Stefan-Boltzmann law, the radiative energy emitted by one square meter of an object is equal to a constant multiplied by its temperature raised to the ____________ power.

  1. Negative third

  2. Zeroeth

  3. Fourth

  4. Tenth
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The Stefan-Boltzmann law states that the power radiated per unit area of a black body is directly proportional to the fourth power of its absolute temperature (P = sigma * T^4).

Multiple choice commercial applications management of natural resources unequal distribution of resources protecting our environment rules are for everyone

__________ energy is the main driving force of the ecological system.

  1. Hydro

  2. Solar

  3. Electric

  4. Mechanical
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Solar energy is the primary source of energy for almost all ecological systems on Earth, as it drives photosynthesis in plants, which forms the base of the food chain.

Multiple choice commercial applications management of natural resources unequal distribution of resources protecting our environment rules are for everyone

Thermal belts are:

  1. Pockets of warm air resting on a valley during the afternoon

  2. Pockets of cold air resting on a valley floor at night

  3. Warmer hillsides that are less likely to experience freezing conditions

  4. Cold, below-freezing air found at the top of a mountain
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Thermal belts are areas on hillsides that remain warmer than the valley floor at night, often because cold air sinks into the valley (temperature inversion), protecting the hillside from frost.