## ALTERNATING CURRENT QUIZ-5

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
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 Î© 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⁡(Ï‰t). When connected across an unknown load, it gives a voltage output of v=v0 sin⁡[Ï‰t+(Ï€/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, -Ï€/4
•  2.5, -Ï€/2
•  2.5, +Ï€/2
•  2.5, -Ï€/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 Î© and an impedance 22 Î©. 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 Î¼F
•  50/(Ï€√3) Î¼F
•  50/√2 Î¼F
•  100/(Ï€√3) Î¼F
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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BEST NEET COACHING CENTER | BEST IIT JEE COACHING INSTITUTE | BEST NEET & IIT JEE COACHING: Alternating Current - Quiz 5
Alternating Current - Quiz 5