## ALTERNATING CURRENT QUIZ-3

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. Two alternating voltage generators produce emfs of the same amplitude E0 but with a phase difference of Ï€/3. The resultant emf is?
•  E0 sin⁡[Ï‰t+(Ï€/3)]
•  E0 sin⁡[Ï‰t+(Ï€/6)]
•  √3 E0 sin⁡[Ï‰t+(Ï€/6)]
•  √3 E0 sin⁡[Ï‰t+(Ï€/2)]
Solution

Q2. Two alternating voltage generators produce emfs of the same amplitude E0 but with a phase difference of Ï€/3. The resultant emf is
•  0.1 A
•  0.3 A
•  0.6 A
•  0.2 A
Solution

Q3. A parallel plate capacitor C with plates of unit area and separation d is filled with a liquid of dielectric constant K = 2. The level of liquid is d/3 initially. Suppose the liquid level decreases at a constant speed v, the time constant as a function of time t is.
•
•
•
•
Solution

Q4. For an LCR series circuit with an ac source of angular frequency Ï‰,
•  Circuit will be capacitor if Ï‰>1/√LC
•  Circuit will be inductive if Ï‰=1/√LC
•  Power factor of circuit will be unity if capacitive reactance equals inductive reactance
•  Current will be leading voltage if Ï‰>1/√LC
Solution

Q5. A dc ammeter and a hot wire ammeter are connected to a circuit in series. When a direct current is passed through circuit, the dc ammeter shows 6 A. When ac current flows through circuit, the ac ammeter shows 8 A. What will be reading of each ammeter, if dc and ac currents flow simultaneously through the circuit?
•  dc=6 A,ac=10 A
•  dc=3 A,ac=5 A
•  dc=5 A,ac=8 A
•  dc=2 A,ac=3 A
Solution

Q6. When 100 V dc is applied across a solenoid, a current of 1.0 A flows in it. When 100 V ac is applied across the same coil, the current drops to 0.5 A. If the frequency of the ac source is 50 Hz, the impedance and inductance of the solenoid are
•  200 Î© and 0.55 H
•  100 Î© and 0.86 H
•  200 Î© and 1.0 H
•  100 Î© and 0.93 H
Solution
Q7. When an ac source of emf e=E0sin⁡(100 t) is connected across a circuit, the phase difference between emf e and current i in the circuit is observed to be Ï€/4 as shown in Fig. If the circuit consists possibly only of R-C or R-C or L-R series, find the relationship between the two elements
Solution

Q8. In an ac circuit the potential differences across an inductance and resistance joined in series are respectively 16 V and 20 V. The total potential difference across the circuit is
•  20 V
•  25.6 V
•  31.9 V
•  53.5 V
Solution

Q9. A resistor and an inductor are connected to an ac supply of 120 V and 50 Hz. The current in the circuit is 3A. If the power consumed in the circuit is 108 W, then the resistance in the circuit is
Solution

Q10. The voltage time (V-t) graph for triangular wave having peak value V0 is as shown in Fig. The rms value of V in time interval from t=0 to T/4 is?

•  V0/√3
•  V0/2
•  V0/√2
• None of these
Solution

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BEST NEET COACHING CENTER | BEST IIT JEE COACHING INSTITUTE | BEST NEET & IIT JEE COACHING: Alternating Current - Quiz 3
Alternating Current - Quiz 3