Free practice tests · Kids & Youth
Stuff Every Radio Scout Should Know: free practice in 30-second cards
Stuff Every Radio Scout Should Know
Practice facts for the Radio merit badge. Not an official Scouting America credential.
Start Stuff Every Radio Scout Should Know ⚡ Today's sprint 🎙️ Voice mode
Free to start, no sign-up. 73 cards so far. One Knowledge Score and day streak across all your courses.
Questions people ask
Is this practice test free?
Yes. The first 50 cards are free for everyone with no sign-up, each with the answer, why it is right and its sources. Aha Trivia members get all 73 cards and timed practice exams.
How many practice questions are there?
73 practice questions so far. Each one is a 3-choice card that takes about 30 seconds, and the course grows as new cards pass our source checks.
Where do the answers come from?
Every card lists the sources it was checked against, and each answer explains why it is right. If you think an answer is wrong, tap "Challenge this answer" in the game and it gets reviewed.
Can I study in the car?
Yes. Voice mode reads the questions out loud and you answer by voice.
Try 3 cards
- What does a radio transmitter do with radio waves?
Show the answer
It generates and radiates them. A transmitter is an electronic device connected to an antenna that radiates radio waves.
- What is the basic job of a radio receiver?
Show the answer
It picks up radio waves with an antenna. A receiver uses an antenna to pick up radio waves sent by a transmitter.
- What is the frequency range of radio waves?
Show the answer
3 Hz to 300 GHz. Radio waves are electromagnetic waves with frequencies from 3 hertz to 300 gigahertz.
All 73 practice questions
The first 50 are free, with the answer, why it's right and the official sources. The other 23 (🔒) open with a membership (every test). Or play them as a game and track what you've learned.
Show all 73 questions
- What does a radio transmitter do with radio waves?
- What is the basic job of a radio receiver?
- What is the frequency range of radio waves?
- Besides communication, what is one use of radio waves?
- How does a transmitter put information onto a radio wave?
- What does a radar receiver learn from reflected radio waves?
- How does a GPS receiver figure out its position?
- What do garage door openers and keyless entry systems use radio for?
- Who first proved that radio waves exist?
- What did Marconi send across the Atlantic in 1901?
- What was special about the KDKA broadcast in 1920?
- Which organization coordinates frequency band allocation worldwide?
- What happens when two nearby transmitters use the same frequency?
- Why is interference with emergency communications dangerous?
- What is a call sign used for in broadcasting?
- Which consumer devices may operate without a license at low power?
- What does jamming do to radio reception?
- What does a directional antenna do?
- What does an omnidirectional antenna do?
- Why does a radio signal get weaker farther from the transmitter?
- What can limit the range of a radio transmission?
- How fast do radio waves travel in a vacuum?
- Why are radio waves useful for communication in bad weather?
- What is a carrier wave?
- In AM radio, what part of the carrier wave is varied?
- In FM radio, what part of the carrier wave is varied?
- What does a receiver's tuned circuit do?
- What is bandwidth a measure of?
- Why is the radio spectrum a limited resource?
- Why can digital modulation send more information in a given bandwidth?
- What does a transducer do at the sending end of a radio system?
- What does a loudspeaker do in a radio receiver?
- What is the function of an antenna in radio?
- What is one safety step when working with radio gear?
- What should you do for an electrical burn?
- How can you help prevent lithium-ion battery fires?
- What does NOAA Weather Radio do?
- What is RFID used for in everyday life?
- What is Airplane Mode on a phone for?
- What is a benefit and a limitation of cell phones in emergencies?
- How does wireless charging move energy to a phone?
- What is the difference between a block diagram and a schematic?
- What does a repeater do for amateur radio?
- Why does the FCC have an amateur radio service?
- What does a broadcast radio station do that a two-way radio does not?
- What is the main difference between commercial broadcast radio and hobby radio?
- What does a distant (DX) station mean to a radio listener?
- How does CW Morse Code carry information on a radio wave?
- What does frequency hopping do to help a radio signal?
- Why can digital radio standards like Wi-Fi and Bluetooth be more reliable than analog?
- How does the maximum data rate of Wi-Fi compare with a fiber-optic system? 🔒
- What is the job of a feedline in a radio station? 🔒
- What does an amplifier do in a radio station block diagram? 🔒
- What does a transceiver combine in one unit? 🔒
- What does the FCC do with radio in the United States? 🔒
- Why do radio operators use the phonetic alphabet? 🔒
- How does a cellular system differ from broadcast radio? 🔒
- What do amateur radio Q signals do? 🔒
- How would you make an emergency call on a ham radio? 🔒
- How does a handheld transceiver differ from a base station? 🔒
- What does a signal report record during a radio contact? 🔒
- What do FCC broadcast regulations cover for radio stations? 🔒
- What is a segue in radio broadcasting? 🔒
- What does dead air mean in radio broadcasting? 🔒
- What is a PSA in radio broadcasting? 🔒
- What are alternative radio platforms besides traditional broadcasting? 🔒
- Why are some distant AM stations heard only at night? 🔒
- What does a shortwave listener compare between day and night logs? 🔒
- What is amateur radio direction finding used for? 🔒
- What is a simple directional antenna used for in fox hunting? 🔒
- What is the Family Radio Service (FRS)? 🔒
- How can FRS or GMRS radios be useful in an emergency? 🔒
- What does a radio career exploration ask you to research? 🔒