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ALTERNATING CURRENT QUIZ-5

Dear Readers,

JEE Advanced Physics Syllabus can be referred by the IIT aspirants to get a detailed list of all topics that are important in cracking the entrance examination. JEE Advanced syllabus for Physics has been designed in such a way that it offers very practical and application-based learning to further make it easier for students to understand every concept or topic by correlating it with day-to-day experiences. In comparison to the other two subjects, the syllabus of JEE Advanced for physics is developed in such a way so as to test the deep understanding and application of concepts.

Q1. In the L-C-R circuit shown, the impedance is
  •  500 Ω
  •  300 Ω
  •  100 Ω
  •  200 Ω
Solution


Q2. Figure shows an iron-cored transformer assumed to be 100% efficient. The ratio of the secondary turns to the primary turns is 1:20. A 240 V ac supply is connected to the primary coil and a 6.0 Ω resistor is connected to the secondary coil. What is the current in the primary coil?
  •  0.10 A
  •  0.14 A
  •  2.0 A
  •  40 A
Solution


Q3. A current source sends a current I=i0 cos⁡(ωt). When connected across an unknown load, it gives a voltage output of v=v0 sin⁡[ωt+(π/4)] across the load. Then the voltage across the current source may be brought in phase with the current through it by
  •  Connecting an inductor in series with the load
  •  Connecting a capacitor in series with the load
  •  Connecting an inductor in parallel with the load
  •  Connecting a capacitor in parallel with the load
Solution

Q4. Two sinusoidal voltages of same frequency are shown in Fig. What is the frequency and the phase relationship between the voltages? frequency/Hz phase lead of N over M in rad/s
  •  0.4, -π/4
  •  2.5, -π/2
  •  2.5, +π/2
  •  2.5, -π/4
Solution


Q5. In a series LCR circuit the voltage across the resistance, capacitance and inductance is 10 V each. If the capacitance is short circuited, the voltage across the inductance will be
  •  10 V
  •  10/√2 V
  •  (10/3) V
  •  20 V
Solution


Q6. An rms voltage of 110 V is applied across a series circuit having a resistance 11 Ω and an impedance 22 Ω. The power consumed is
  •  275 W
  •  366 W
  •  550 W
  •  1100 W
Solution
Q7. In an ideal transformer, the voltage and the current in the primary coil are 200 V and 2 A, respectively. If the voltage in the secondary coil is 2000 V, then the value of current in the secondary coil will be
  •  0.2 A
  •  2 A
  •  10 A
  •  20 A
Solution


Q8. A 50 W, 100 V lamps is to be connected to ac mains of 200 V, 50 Hz. What capacitor is essential to be put in series with the lamp?
  •  25/√2 μF
  •  50/(π√3) μF
  •  50/√2 μF
  •  100/(π√3) μF
Solution


Q9. A typical light dimmer used to dim the stage lights in a theatre consists of a variable induction for L (where inductance is adjustable between zero and L_max) connected in series with a light bulb B as shown in Fig. The mains electrical supply is 220 V at 50 Hz, the light bulb is rated at 220 V, 1100 W. What L_max is required if the rate of energy dissipated in the light bulb is to be varied by a factor of 5 from its upper limit of 1100 W?
  •  0.69 H
  •  0.28 H
  •  0.38 H
  •  0.56 H
Solution


Q10. In the circuit shown in Fig, if both the bulbs B1 and B2 are identical

  •  Their brightness will be the same
  •  B2 will be brighter than B1
  •  B1 will be brighter than B2
  • Only B2 will glow because the capacitor has infinite impedance
Solution


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