Crystal Radio Quiz

What is the main purpose of a crystal radio?

• To amplify electrical signals.

• To convert radio waves into sound.

• To generate radio waves.

• To measure electrical currents.

Which of the following is NOT a component of a crystal radio?

• Antenna

• Transistor

• Tuning circuit

• Crystal detector

Why were crystal radios popular in the early 20th century?

• They were very expensive.

• They were easy to build and use.

• They could receive a wide range of frequencies.

• They were powered by batteries.

What was a major limitation of crystal radios?

• They could only receive AM signals.

• They required a large power source.

• They had poor sensitivity and range.

• They were very heavy.

What role did crystal radios play in the development of radio technology?

• They replaced vacuum tubes in radios.

• They laid the foundation for more advanced radios.

• They were only used for military purposes.

• They had no significant impact on radio technology.

What material is often used for the crystal detector in a crystal radio?

• Copper

• Galena

• Silicon

• Gold

What does the tuning circuit do in a crystal radio?

• Amplifies the signal.

• Selects a specific frequency.

• Converts AC to DC.

• Provides power to the radio.

Why was the quality of audio often poor in crystal radios?

• The antennas were too small.

• There was no amplification.

• The crystals were not pure enough.

• The tuning circuits were too simple.