Class VII

To carry out a fair test, there should be change of number of variable at a time which is
  1. 1
  2. 2
  3. 3
  4. 4
Toxic air pollutants like Sulphur dioxide and nitrogen oxides are produced by burning
  1. coal
  2. oil
  3. both a and b
  4. gases
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
For heating purpose more suitable flame is
  1. luminous flame
  2. non-luminous flame
  3. aluminous flame
  4. dull flame
Energy resources which will not run out in long term are called
  1. renewable
  2. non-renewable
  3. generating
  4. producing
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