# Electronics - Alternating Current vs Direct Current

### Exercise :: Alternating Current vs Direct Current - General Questions

31.

What is the name of a device that converts sound waves to electrical waves?

 A. an amplifier B. an antenna C. a filter D. a microphone

Answer: Option D

Explanation:

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32.

If the frequency of a radio wave is increased, then its wavelength will:

 A. increase B. decrease C. remain the same D. cannot tell

Answer: Option B

Explanation:

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33.

What is the rms voltage value of an ac signal whose peak oscilloscope display uses 3 major divisions above the zero setting? (V/cm = 5)

 A. 5.3 V B. 10.6 V C. 15.0 V D. 21.2 V

Answer: Option B

Explanation:

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34.

What is the peak-to-peak current value when an ammeter measures a 20 mA value?

 A. 14 mA B. 28 mA C. 40 mA D. 57 mA

Answer: Option D

Explanation:

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35.

How long would it take to transmit an electromagnetic wave to a receiving antenna 1,000 miles away?

 A. 5.38 ms B. 10.8 ms C. 53.8 ms D. 108 ms

Answer: Option A

Explanation:

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