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Physics and chemistry  

created by MANHAR on 4 Aug 14, enabled by Lou
Hard level (43% of success)    7 questions - 80 players
Very difficult quiz for class 6
 
1
What is the other name of second law of refraction ?
   
   
   
   
2
The amount of heat required to change the state from solid to liquid is called
   
   
   
   
3
Who proved that electron was neutral ?
   
   
   
   
4
What is the minimum distance required to hear an echo ?
   
   
   
   
5
Which law of newton states that mass multiplied by velocity is equal to momentum
   
   
   
   
6
How can permanent hardness of water be removed ?
   
   
   
   
7
What is the valency of oxygen ?
   
   
   
   
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