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Current Electricity

Current Electricity
In which of the following substances the resistance decreases with increase in temperature?

Silver
Constantan
Copper
Carbon

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Current Electricity
Three identical resistors are first connected in parallel and then in series. The resultant resistance of the first combination to the second will be

9 times
3 times
1/9 times
1/3 times

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Current Electricity
When one lag of parallel circuit is opened out the total current will

Increases
None of the listed here
Decreases
Become zero

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

An insulator
A conductor
None of the listed here
A semiconductor

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Current Electricity
With rise in temperature the resistance of pure metals

Decreases
Increases
Remains constant
First increases and then decreases

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Current Electricity
Resistance of a material always decreases if

Temperature of material is increased
Number of free electrons available becomes more
None of these
Temperature of material is decreased

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