Introduction:
Business cycle refers to the fluctuations in the economic activities of a country over a period of time. It is a natural and recurring phenomenon that has been observed in almost all economies of the world. In this question, we have to identify the feature of the business cycle that is not correct.

Features of Business Cycle:

1. Business cycle is a natural phenomenon:
- Business cycle is a natural phenomenon that occurs due to various factors such as changes in demand and supply, changes in technology, government policies, etc.

2. Business cycle follows an irregular pattern:
- Business cycle does not follow a perfectly timed cycle. It varies in terms of intensity, length, and frequency. The timing of business cycles is unpredictable and can vary from one cycle to another.

3. Business cycle is a recurring phenomenon:
- Business cycle is a recurring phenomenon that occurs periodically. It is characterized by alternating periods of expansion and contraction.

4. Business cycle affects all sectors of the economy:
- Business cycle affects all sectors of the economy, including agriculture, industry, and services. It also affects the employment rate, inflation rate, and other economic indicators.

5. Business cycle is a complex phenomenon:
- Business cycle is a complex phenomenon that involves various factors such as consumer behavior, investment, government policies, etc. It is difficult to predict the exact timing and duration of business cycles.

Correct Answer:
- Business cycle follows a perfectly timed cycle is not a correct feature of the business cycle. Business cycle varies in terms of intensity, length, and frequency.

Conclusion:
Business cycle is a complex and recurring phenomenon that affects all sectors of the economy. It does not follow a perfectly timed cycle and varies in terms of intensity, length, and frequency.

Business cycle cannot easy to ascertain the changes.
It is not perfectly timed cycle . So it is incorrect