Biogas can be a good substitute for

  • A
    Fuel wood
  • B
    Petroleum and oil
  • C
    Coal
  • D
    Charcoal

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$(i)$ The power generation by the above two methods is non-polluting. True/False.
$(ii)$ List any two applications of solar energy.
$(iii)$ What is a photovoltaic cell?

While India's population is $15\%$ of the world,its annual energy consumption is only (in $\%$)

The energy generated by a hydel power plant is:

Fuel wood is

The daily input of sunlight per square meter per day on the Earth is approximately:

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