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Assertion: The average power loss in series LC circuit is always zero.

Reason: The average values of voltage and current in A.C. is zero.

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Important Questions on Alternating Current

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Beta Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise (Assertion & Reason)>Q 16
Assertion :- Average of sinusoidal A.C. can never be zero for half cycle. 
Reason :- Impedance given by inductance does not depends on frequency. 
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Beta Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise (Assertion & Reason)>Q 19

Assertion : Capacitor serves as a block for D.C.and offers an easy path to A.C. 
Reason : Capacitive reactance is inversely proportional to frequency

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Beta Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise (Assertion & Reason)>Q 20

Assertion: Choke coil is preferred over a resistor to adjust current in an AC circuit.

Reason: Power factor for inductance is zero. So, power loss is also zero.

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Beta Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise (Assertion & Reason)>Q 21
Assertion : When capacitive reactance is smaller than the inductive reactance in series LCR circuit, voltage leads the current. 
Reason : In series LCR circuit inductive reactance is always greater than capacitive reactance
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Beta Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise (Assertion & Reason)>Q 22

Assertion: In series RL AC circuit, voltage leads the current.

Reason: In series RC AC circuit, current leads the voltage.

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Beta Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise (Assertion & Reason)>Q 23

Assertion: An alternating current of frequency 50 Hz becomes zero, 100 times in one second.

Reason: Alternating current changes direction and becomes zero twice in a cycle.

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Beta Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise (Assertion & Reason)>Q 24
Assertion : An alternating current is more dangerous than a direct steady current.
Reason : The frequency of the alternating current is injurious to the human body. 
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Beta Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise (Assertion & Reason)>Q 25
Assertion :- A sinusoidal alternating current does not show any average magnetic effects.
Reason :- The average value of an alternating current is zero.