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Alternating Current Electromagnetic Waves Test Online

 Test Name Alternating Current & Electromagnetic Waves Test Subject Physics Test Type MCQs Total Question 15 Total Marks 30 Total Time 15 Mints Test Help For Physics Subject Test Prep. All Admissions Test. All Jobs Test prep. Medical Test prep. Engineering Test prep.

Alternating Current & Electromagnetic Waves Test are available. Attempt online Multiple Choice Questions of Alternating Current & Electromagnetic Waves over here.

Physics

1. The current gain for a transistor working as common base amplifier is 0.96. If the emitter current is 7.2 mA, the base current will be:

Question 1 of 15

2. A 50 Hz a.c. source of 20 volt is connected across R and C as shown in figurer. The voltage across R is 12 volt. The voltage across C is:

Question 2 of 15

3. An inductor and a resistor in series are connected to an A.C. supply of variable frequency. As the frequency of the source is increased, the phase angle between current and the potential difference across L with:

Question 3 of 15

4. With the decreases of current in the primary coil from 2 amperes to zero value in 0.01s the emf generated in the secondary coil is 1000 volts. The mutual inductance of the two coils is

Question 4 of 15

5. A coil has an inductance of 0.7 Henry and is joined in series with a resistance of 220 Ω. When the alternating emf of 220 V at 50 Hz is applied to it then the phase through which current lags behind the applied emf and the wattles component of current in the circuit will be respectively

Question 5 of 15

6. A capacitor of capacitance 2μF is connected in the tank circuit of an oscillator oscillating with a frequency of 1 kHz. If the current flowing in the circuit is 2 m A, the voltage across the capacitor will be:

Question 6 of 15

7. In an ideal parallel LC circuit, the capacitor is charged by connecting it to a D.C. source which is then disconnected. The current in the circuit

Question 7 of 15

8. If we decrease the frequency of the applied A.C. with a purely capacitive load, do (1) the amplitude of Vc and (2) amplitude of Ic increase, decrease of remain the same.

Question 8 of 15

9. An A.C. circuit containing only capacitance, the current:

Question 9 of 15

10. In a circuit the coil of a choke:

Question 10 of 15

11. The coefficient of mutual inductance. When magnetic flux changes by 2 x 10⁻² Wb and current changes by 0.01 A is

Question 11 of 15

12. Turn ratio in a step up transformer is 1 : 2 if a Lechlanche cell of 1.5 V is connected across the input, then the voltage across the output will be

Question 12 of 15

13. According to Maxwell’s hypothesis, changing of electric field give rise to:

Question 13 of 15

14. If an AC main supply is given to be 220 v. The average emf during a positive half cycle will be

Question 14 of 15

15. An AC source of angular frequency ω is fed across a resistor R and a capacitor C in series. The current registered is I. If now the frequency of source is changed to ω/3 (but maintaining the same voltage), the current in the circuit is found to be halved. Calculate the ratio of reactance to resistance at the original frequency ω

Question 15 of 15

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