With regard to the component of population density, which state is the odd one out of the following?

The correct answer is Arunachal Pradesh.

Step-by-Step Explanation:

1. Understanding Population Density: Population density measures the average number of individuals living per unit area, usually expressed as persons per square kilometer (sq. km).

2. Comparing the Given States (per Census of India):
- Bihar: High population density (1,106 persons per sq. km).
- Uttar Pradesh: High population density (829 persons per sq. km).
- Tamil Nadu: High population density (555 persons per sq. km).
- Arunachal Pradesh: Extremely low population density (17 persons per sq. km), which is the lowest among all states in India.

3. Conclusion:
Bihar, Uttar Pradesh, and Tamil Nadu are all densely populated states. In contrast, Arunachal Pradesh has a very low population density due to its mountainous terrain and vast forest cover. Therefore, Arunachal Pradesh is the odd one out.