Radio Theory & Practice Quiz - Certifications Ham Radio ASOC (India)

Free practice quiz: Radio Theory & Practice (Certifications Ham Radio ASOC (India)). 18 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

Sample questions

1. A 12 V supply drives current through a 4 ohm resistor. The current is:

   1. 0.33 A
   2. 48 A
   3. 8 A
   4. 3 A
   Show answer

   Answer: D. 3 A

   Ohm's law: I = V/R = 12/4 = 3 A.

2. The wavelength of a 145 MHz signal is about:

   1. 20.7 m
   2. 0.207 m
   3. 2.07 m
   4. 145 m
   Show answer

   Answer: C. 2.07 m

   Wavelength (m) = 300 / f(MHz) = 300/145 = 2.07 m, hence '2-metre band'.

3. Which ionospheric layer absorbs lower HF signals during daytime?

   1. F2 layer
   2. Troposphere
   3. D layer
   4. E layer
   Show answer

   Answer: C. D layer

   The D layer forms in daylight and absorbs lower HF; it fades at night, so 40/80 m open up.

4. The 'skip zone' is:

   1. A band reserved for satellites
   2. The zone around a repeater
   3. The frequency gap in split operation
   4. The area between ground-wave range and where the skywave returns
   Show answer

   Answer: D. The area between ground-wave range and where the skywave returns

   Stations in the skip zone hear neither the ground wave nor the skywave.

5. The second harmonic of 7.1 MHz falls at:

   1. 14.2 MHz
   2. 3.55 MHz
   3. 21.3 MHz
   4. 7.2 MHz
   Show answer

   Answer: A. 14.2 MHz

   2nd harmonic = 2 x f = 14.2 MHz. Filters keep harmonics out of other bands.

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