*Question E7A02:
What is the function of a decade counter?*  

*Correct Answer is  A: It produces one output pulse for every 10 input pulses*  

### AI Response: (may contain errors)  

A decade counter is a type of digital counter that counts from 0 to 9 (10 states) and then resets to 0. 

### Correct Answer Explanation:
- **A: It produces one output pulse for every 10 input pulses**  
  This is correct because a decade counter increments its count with each input pulse and generates an output pulse only after counting 10 input pulses. Thus, it effectively divides the input frequency by 10.

### Incorrect Answer Explanations:
- **B: It decodes a decimal number for display on a seven-segment LED display**  
  This is incorrect because while a decade counter can be used in conjunction with a decoder to display numbers, the counter itself does not perform the decoding function. The counter simply counts.

- **C: It produces 10 output pulses for every input pulse**  
  This is incorrect because a decade counter produces only one output pulse for every 10 input pulses, not 10 output pulses for each input pulse.

- **D: It decodes a binary number for display on a seven-segment LED display**  
  This is incorrect because a decade counter does not decode binary numbers. It counts in decimal (0-9) and may be used with a decoder for display purposes, but the counter itself does not perform decoding.

### Summary:
- A decade counter counts from 0 to 9 and generates one output pulse for every 10 input pulses.
- It is often used in digital circuits for counting applications and can be paired with decoders for visual output on displays. 

This understanding is crucial for grasping how digital counters function in various electronic applications.