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Current Electricity

Current Electricity
If an electric current is passed through a nerve, the man

Is excited
Becomes insensitive to pain
Begins to weep
Begins to laugh

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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%
0.4%
0.3%

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Current Electricity
The maximum current rating for a 10 kΩ, 0.5 W resistor is

0.707 mA
14.14 mA
7.07 mA
28.28 mA

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Current Electricity
Two bulbs of 500 W and 200 W rated at 250 V will have resistance ratio as

5 : 2
25 : 4
4 : 25
2 : 5

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Current Electricity
The specific resistance of a metallic conductor ______ with rise in temperature.

None of the listed here
Remains unchanged
Increases
Decreases

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Current Electricity
A rheostat differs from potentiometer in the respect that it

Has higher wattage rating
Has large number of turns
Offers large number of tapping
Has lower wattage rating

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