Pick out the most correct statement with reference to earth satellites

Options

A. Geostationary satellites are used for remote sensing
B. Polar satellites are used for telecommunications
C. INSAT group of satellites belong to geostationary satellites
D. Polar satellites are at a height of about 36,000 km

Answer

To solve the question regarding Earth satellites, we need to analyze each option provided and determine which statement is the most accurate. Here’s a step-by-step breakdown of the solution:

### Step 1: Understand the Types of Satellites
- **Geo-stationary Satellites**: These satellites orbit the Earth at a height of approximately 36,000 km above the equator. They have a time period of 24 hours, meaning they rotate at the same rate as the Earth. This allows them to stay fixed over one point on the Earth's surface.
- **Polar Satellites**: These satellites orbit the Earth at a lower altitude, typically around 800 km. They pass over the poles and have a different orbital path, allowing them to cover the entire Earth as the planet rotates beneath them.

### Step 2: Analyze Each Statement
1. **Statement A**: "Geo-stationary satellites are used for remote sensing."
- **Analysis**: This is incorrect. Geo-stationary satellites are primarily used for telecommunications and weather forecasting, not remote sensing.

2. **Statement B**: "Polar satellites are used for telecommunications."
- **Analysis**: This is incorrect. Polar satellites are mainly used for Earth observation and mapping, not telecommunications.

3. **Statement C**: "INSAT group of satellites belong to a stationary satellite."
- **Analysis**: This is correct. The INSAT (Indian National Satellite System) is a group of geo-stationary satellites used for telecommunications, broadcasting, and meteorology.

4. **Statement D**: "Polar satellites are at a height of about 3600 km."
- **Analysis**: This is incorrect. Polar satellites typically orbit at around 800 km, not 3600 km.

### Step 3: Conclusion
After analyzing all the statements, the most correct statement is **Statement C**: "INSAT group of satellites belong to a stationary satellite."

### Final Answer
**The correct answer is Statement C.**

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