JEE Main & Advanced Physics Alternating Current / प्रत्यावर्ती धारा Question Bank

done Assertion and Reason Total Questions - 16

• question_answer1)
  Assertion             :       In series LCR circuit resonance can take place. Reason                 :       Resonance takes place if inductance and capacitive reactances are equal and opposite. [AIIMS 1998]
  A)
              If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
              If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
              If assertion is true but reason is false. done clear
  D)
              If the assertion and reason both are false. done clear
  E)
              If assertion is false but reason is true. done clear
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• question_answer2)
  Assertion             :       The alternating current lags behind the e.m.f. by a phase angle of \[\pi /2\], when ac flows through an inductor. Reason                 :   The inductive reactance increases as the frequency of ac source decreases.
  A)
              If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
              If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
              If assertion is true but reason is false. done clear
  D)
              If the assertion and reason both are false. done clear
  E)
              If assertion is false but reason is true. done clear
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• question_answer3)
  Assertion             :       Capacitor serves as a block for dc and offers an easy path to ac. Reason                 :   Capacitive reactance is inversely proportional to frequency.
  A)
              If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
              If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
              If assertion is true but reason is false. done clear
  D)
              If the assertion and reason both are false. done clear
  E)
              If assertion is false but reason is true. done clear
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• question_answer4)
  Assertion             :       When capacitive reactance is smaller than the inductive reactance in LCR current, e.m.f. leads the current . Reason                 :   The phase angle is the angle between the alternating e.m.f. and alternating current of the circuit.
  A)
              If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
              If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
              If assertion is true but reason is false. done clear
  D)
              If the assertion and reason both are false. done clear
  E)
              If assertion is false but reason is true. done clear
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• question_answer5)
  Assertion             :       Chock coil is preferred over a resistor to adjust current in an ac circuit. Reason                 :   Power factor for inductance is zero.
  A)
              If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
              If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
              If assertion is true but reason is false. done clear
  D)
              If the assertion and reason both are false. done clear
  E)
              If assertion is false but reason is true. done clear
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• question_answer6)
  Assertion             :       If the frequency of alternating current in an ac circuit consisting of an inductance coil is increased then current gets decreased. Reason                 :   The current is inversely proportional to frequency of alternating current.
  A)
              If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
              If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
              If assertion is true but reason is false. done clear
  D)
              If the assertion and reason both are false. done clear
  E)
              If assertion is false but reason is true. done clear
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• question_answer7)
  Assertion             :       A bulb connected in series with a solenoid is connected to ac source. If a soft iron core is introduced in the solenoid, the bulb will glow brighter. Reason                 :   On introducing soft iron core in the solenoid, the inductance increases.
  A)
              If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
              If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
              If assertion is true but reason is false. done clear
  D)
              If the assertion and reason both are false. done clear
  E)
              If assertion is false but reason is true. done clear
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• question_answer8)
  Assertion             :       An alternating current does not show any magnetic effect. Reason                 :   Alternating current varies with time.
  A)
              If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
              If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
              If assertion is true but reason is false. done clear
  D)
              If the assertion and reason both are false. done clear
  E)
              If assertion is false but reason is true. done clear
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• question_answer9)
  Assertion             :       The dc and ac both can be measured by a hot wire instrument. Reason                 :   The hot wire instrument is based on the principle of magnetic effect of current.
  A)
              If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
              If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
              If assertion is true but reason is false. done clear
  D)
              If the assertion and reason both are false. done clear
  E)
              If assertion is false but reason is true. done clear
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• question_answer10)
  Assertion             :       ac is more dangerous than dc Reason                 :   Frequency of ac is dangerous for human body.
  A)
              If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
              If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
              If assertion is true but reason is false. done clear
  D)
              If the assertion and reason both are false. done clear
  E)
              If assertion is false but reason is true. done clear
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• question_answer11)
  Assertion             :       Average value of ac over a complete cycle is always zero. Reason                 :   Average value of ac is always defined over half cycle.
  A)
              If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
              If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
              If assertion is true but reason is false. done clear
  D)
              If the assertion and reason both are false. done clear
  E)
              If assertion is false but reason is true. done clear
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• question_answer12)
  Assertion             :       The division are equally marked on the scale of ac ammeter. Reason                 :   Heat produced is directly proportional to the current.
  A)
              If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
              If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
              If assertion is true but reason is false. done clear
  D)
              If the assertion and reason both are false. done clear
  E)
              If assertion is false but reason is true. done clear
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• question_answer13)
  Assertion             :       When ac circuit contain resistor only, its power is minimum. Reason                 :   Power of a circuit is independent of phase angle.
  A)
              If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
              If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
              If assertion is true but reason is false. done clear
  D)
              If the assertion and reason both are false. done clear
  E)
              If assertion is false but reason is true. done clear
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• question_answer14)
  Assertion             :       An electric lamp connected in series with a  variable capacitor and ac source, its brightness increases with increase in capacitance. Reason                 :   Capacitive reactance decrease with increase in capacitance of capacitor.
  A)
              If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
              If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
              If assertion is true but reason is false. done clear
  D)
              If the assertion and reason both are false. done clear
  E)
              If assertion is false but reason is true. done clear
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• question_answer15)
  Assertion             :       An inductance and a resistance are connected in series with an ac circuit. In this circuit the current and the potential difference across the resistance lag behind potential difference across the inductance by an angle p/2. Reason                 :   In LR circuit voltage leads the current by phase angle which depends on the value of inductance and resistance both.
  A)
              If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
              If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
              If assertion is true but reason is false. done clear
  D)
              If the assertion and reason both are false. done clear
  E)
              If assertion is false but reason is true. done clear
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• question_answer16)
  Assertion             :       A capacitor of suitable capacitance can be used in an ac circuit in place of the choke coil. Reason                 :   A capacitor blocks dc and allows ac only.
  A)
              If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
              If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
              If assertion is true but reason is false. done clear
  D)
              If the assertion and reason both are false. done clear
  E)
              If assertion is false but reason is true. done clear
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