Class VII

To harness solar energy products which are helpful are
  1. solar furnace
  2. solar heater
  3. solar cells
  4. all of them
Energy resources which will not run out in long term are called
  1. renewable
  2. non-renewable
  3. generating
  4. producing
Thousands or mirrors or curved metals are used to focus solar energy on to small point to make it very hot happens in
  1. solar cells
  2. solar heater
  3. solar furnace
  4. solar battery
Coal, crude, petroleum and natural gas are examples of
  1. elements
  2. man-made fuels
  3. fossils fuel
  4. compounds
Plankton buried under heat and pressure over a long period of time is turned in to
  1. crude oil
  2. natural gas
  3. coal
  4. kerosene
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