Class X

Which of the following is the ultimate source of energy for us?
  1. LPG
  2. Nuclear
  3. Solar
  4. CNG
 Chif constituent of natural gas is :
  1. Methane
  2. Ethane
  3. Butane
  4. Propane
The power plant which converts potential energy of falling water into electricity is
  1. Nuclear plant
  2. Thermal plant
  3. Hydro power plant
  4. Wind plant
Which of the following produces energy because of temperature difference at various levels in ocean
  1. Tidal energy
  2. Wave energy
  3. Solar energy
  4. Ocean thermal energy
Which method is used to produce electricity in thermal power plant?
  1. By heating chargeable cells
  2. By boiling water
  3. By pushing pistons by heat energy
  4. Any of above
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