Class VIII

In thunderstorm, the charges accumulate near the upper edges of clouds are
  1. negatively charged
  2. positively charged
  3. neutral
  4. none of these
Name the scientist who showed that lightning and the spark from your clothes are essentially the same phenomena ? 
  1. Thomas Alva Edison 
  2. Benjamin Fraklin 
  3. Franklin D . Roosevelt 
  4. Isaac Newton 
When charges move, they constitute an ... 
  1. Electric current 
  2. Magnetic effect 
  3. Heating effect 
  4. All of the above 
Which scale is used to measure the magnitude of earth quake?
  1. Celsius
  2. Kelvin
  3. Richter
  4. Pascal
Which device is used to protect building from lightning conductor ? 
  1. Seismograph 
  2. Lightning Conductor 
  3. Barometer 
  4. Thermal Conductor 
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