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Alternating Current JEE physics - Alternating Current

CBSE - STD 12 Science - JEE physics (CBSE - English Medium). 203 questions in this chapter.

Question types

Alternating Current question types

203 questions across 2 question groups — pick any mix to generate a JEE physics paper with step-by-step answer keys.

203
Questions
2
Question groups
5
Question types
Sample Questions

Alternating Current questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 1Assertion & Reason1 Mark
Assertion $\quad:$ In series $L C R$ circuit resonance can take place.
Reason : Resonance takes place if inductance and capacitive reactances are equal and opposite.
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Q 2Assertion & Reason1 Mark
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.
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Q 3Assertion & Reason1 Mark
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 $\pi / 2$.
Reason : In $L R$ circuit voltage leads the current by phase angle which depends on the value of inductance and resistance both.
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Q 4Assertion & Reason1 Mark
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.
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Q 6MCQ1 Mark
A series ac circuit consist of an inductor and a capacitor. The inductance and capacitance is respectively $1$ henry and $25 \mu F$. If the current is maximum in circuit then angular frequency will be
  • ✓
    $200$
  • B
    $100$
  • C
    $50$
  • D
    $200 / 2 \pi$

Answer: A.

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Q 7MCQ1 Mark
For series $\text{LCR}$ circuit, wrong statement is
  • A
    Applied e.m.f. and potential difference across resistance are in same phase
  • B
    Applied e.m.f. and potential difference at inductor coil have phase difference of $\pi / 2$
  • ✓
    Potential difference at capacitor and inductor have phase difference of $\pi / 2$
  • D
    Potential difference across resistance and capacitor have phase difference of $\pi / 2$

Answer: C.

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Q 8MCQ1 Mark
Which of the following curves correctly represents the variation of capacitive reactance $X$ with frequency $f$
  • A
    Image
  • ✓
    Image
  • C
    Image
  • D
    Image

Answer: B.

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Q 9MCQ1 Mark
In the circuit shown below, what will be the readings of the voltmeter and ammeter
Image
  • A
    $800\  V, 2 \ A$
  • B
    $300 \  V, 2 \ A$
  • ✓
    $220 \ V , 2.2\  A$
  • D
    $100\  V , 2 \ A$

Answer: C.

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Q 10MCQ1 Mark
There is a $5 \Omega$ resistance in an ac, circuit. Inductance of $0.1 H$ is connected with it in series. If equation of ac e.m.f. is $5 \sin 50 t$ then the phase difference between current and e.m.f. is
  • A
    $\frac{\pi}{2}$
  • B
    $\frac{\pi}{6}$
  • ✓
    $\frac{\pi}{4}$
  • D
    0

Answer: C.

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