Electronic Principles
One henry of inductance is defined as:

the number of turns of wire in an inductor multiplied by the amount of current flowing through it
the amount of inductance required for generating 1 V of counter emf when the current changes at the rate of 1 A per second
the amount of inductance required to change the frequency of a current by 1 Hz
the amount of counter emf required to reduce a current to 1 A
None of these

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Electronic Principles
In a pure inductor:

ac current lags the voltage by 90 degree
None of these
ac current is converted to dc voltage
ac current leads the voltage by 90 degree
ac current and voltage are exactly in phase

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Electronic Principles
A low-pass filter:

None of these
reduces the level of all frequencies by a significant amount
passes higher-frequency signals and reduces lower-frequency signals
has no effect on ac signals
passes lower-frequency signals and reduces higher-frequency signals

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