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Current Electricity

Current Electricity
Eureka has _______ temperature co-efficient of resistance.

Almost zero
Negative
None of the listed here
Positive

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Current Electricity
The resistance of a few meters of wire conductor in closed electrical circuit is

Practically zero
Low
High
Very high

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Current Electricity
A copper wire is stretched so that its length is increased by 0.1 % . The change in its resistance is

None of the listed here
0.2%
0.3%
0.4%

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Current Electricity
A closed switch has a resistance of

Zero
About 500 ohms
Infinity
About 50 ohms

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Current Electricity
Which of the following is the best material for making connecting wires?

Manganin
Nichrome
Copper
Constant

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Current Electricity
The electrical energy required to heat a bucket of water to a certain temperature is 4 kWh. If the heat losses are 20 percent, the energy input is

6 kWh
5 kWh
3.2 kWh
2 kWh

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