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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


1. 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 1 of 15

2. An inductor coil of inductance L is cut into two equal parts and both the parts are connected in parallel. The net inductance is:


Question 2 of 15

3. Frequency of infrared wave is approximately:


Question 3 of 15

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


Question 4 of 15

5. 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 5 of 15

6. 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 of the source is:


Question 6 of 15

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


Question 7 of 15

8. 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 8 of 15

9. 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 9 of 15

10. 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 10 of 15

11. 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 11 of 15

12. Which wavelength of sun is used finally as electric energy?


Question 12 of 15

13. The pressure exerted by an electromagnetic wave of intensity 1 (watt/m²) on a non-reflecting surface is: [c is the velocity of light]


Question 13 of 15

14. 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 14 of 15

15. In a circuit, the current lags behind the voltage by a phase difference of π/2, the circuit will contain which of the following:


Question 15 of 15


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