Question

which type of modulation is used by remote - control toys?
amplitude
frequency
phase
pulse

Explanation:

Remote - control toys commonly use frequency - modulation (FM). FM is less prone to interference compared to amplitude - modulation (AM). Phase - modulation is more complex and not typically used in simple remote - control toys. Pulse - modulation is also not the most common for general remote - control toy applications. Frequency - modulation allows for better signal quality and range for remote - control operations.

Answer:

B. frequency