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

Alternating Current & Electromagnetic Waves Test Online

Physics

1. mark reviewThe 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. mark reviewA 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:

34

Question 2 of 15

3. mark reviewAn 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:  

 

36

Question 3 of 15

4. mark reviewWith 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. mark reviewA 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. mark reviewA 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. mark reviewIn 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. mark reviewIf 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. mark reviewAn A.C. circuit containing only capacitance, the current:

                                                                                                                                                                                                                                                                                                                                                                                                                  

Question 9 of 15

10. mark reviewIn a circuit the coil of a choke:

 

Question 10 of 15

11. mark reviewThe 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. mark reviewTurn 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. mark reviewAccording to Maxwell’s hypothesis, changing of electric field give rise to:

 

Question 13 of 15

14. mark reviewIf 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. mark reviewAn 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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