Current Electricity
If the number of valence electrons of an atoms is less than 4,the substance is usually

An insulator
None of the listed here
A semiconductor
A conductor

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Current Electricity
In an electric kettle water boils in 10 m minutes. It is required to boil the boiler in 15 minutes, using same supply mains

Length of heating element has no effect on heating if water
Length of heating element should be increased
None of these
Length of heating element should be decreased

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