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Electric Circuits and Currents
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General Science for Class 7
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Electric Circuits and Currents
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Electric Circuits and Currents
The metal detectors that are used in malls, stations, airports and other commercial areas have
magnets
resistors
fuses
electromagnets
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Electric Circuits and Currents
Many machines we use, are powered by
thermal energy
sound energy
electric motors
dynamos
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Electric Circuits and Currents
The electricity which involves in attraction is known as
static electricity
current
practical electricity
magnetic electricity
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Electric Circuits and Currents
Anything that slows down the flow of electricity in a circuit is known as
current
offensive power
resistance
high voltage
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Electric Circuits and Currents
A source that makes electrons to move is known as
battery
dam
turbine
dynamo
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Electric Circuits and Currents
When water is electrolyzed, at anode collected gas is
sulphur
oxygen
hydrogen
sulphur dioxide
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Electric Circuits and Currents
Inside cell positive terminal is made of
zinc case
graphite rod
carbon
manganese
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Electric Circuits and Currents
One method of making a strong electromagnet is to increase
voltage in coil
resistance in coil
number of turns in coil
the size of iron bar
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Electric Circuits and Currents
For each electric appliance, the fuse should be fixed with
normal reading
estimated reading
accurate reading
approximate reading
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Electric Circuits and Currents
Electrolysis is also used to purify
sodium
copper
silver
potassium
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