Step 1: Understanding the sectors of economy
- Primary sector: Involves activities that depend directly on natural resources, such as agriculture, fishing, forestry, and mining.
- Secondary sector: Involves industries where raw materials are processed or manufactured into finished goods.
- Tertiary sector: Provides services such as trade, banking, education, and transport.
- Quaternary sector: Deals with knowledge-based services like information technology, R&D, consultancy.
Step 2: Identify the correct sector
Since the question specifies "produced mainly by natural process," it directly refers to the Primary sector.
Step 3: Conclusion
Thus, an item produced mainly by natural processes belongs to the Primary sector.
The correct answer is option (A).
Find the unknown frequency if 24 is the median of the following frequency distribution:
\[\begin{array}{|c|c|c|c|c|c|} \hline \text{Class-interval} & 0-10 & 10-20 & 20-30 & 30-40 & 40-50 \\ \hline \text{Frequency} & 5 & 25 & 25 & \text{$p$} & 7 \\ \hline \end{array}\]
Two concentric circles are of radii $8\ \text{cm}$ and $5\ \text{cm}$. Find the length of the chord of the larger circle which touches (is tangent to) the smaller circle.