The question has statement - 1 and statement - 2 Of the four choices given after the statements , choose the one that best describes the two statements
statement - 1 : Sky wave signals are used for long distance radio communication . These signals are in generel , less stable then ground wave signals
statement - 2 : The state of inosphere varies from to hour day and season to season .

Options

A. Statement-1 is true, Statement-2 is true and Statement-2 is not the correct explanation of Statement-1
B. Statement-1 is false, Statement-2 is true
C. Statement-1 is true, Statement-2 is false
D. Statement-1 is true, Statement-2 is true , Statement-2 is not correct explanation of Statement-1.

Answer

To solve the question, we need to analyze both statements and determine their truthfulness and relationship to each other.

### Step 1: Analyze Statement 1
- **Statement 1**: "Sky wave signals are used for long distance radio communication. These signals are in general less stable than ground wave signals."
- **Analysis**: Sky wave signals are indeed used for long-distance communication, especially in the HF (high frequency) band, because they can reflect off the ionosphere and travel beyond the horizon. However, they are generally less stable than ground wave signals, which follow the curvature of the Earth and provide more consistent communication over shorter distances.
- **Conclusion**: Statement 1 is **true**.

### Step 2: Analyze Statement 2
- **Statement 2**: "The state of the ionosphere varies from hour to hour, day to day, and season to season."
- **Analysis**: The ionosphere is a layer of the Earth's atmosphere that is ionized by solar radiation. Its state does indeed vary due to factors such as solar activity, time of day, and seasonal changes. This variation affects how radio waves propagate, particularly sky waves.
- **Conclusion**: Statement 2 is **true**.

### Step 3: Determine the Relationship Between the Statements
- We have established that both statements are true. However, we need to assess whether Statement 2 provides a correct explanation for Statement 1.
- While the ionosphere's state does affect sky wave communication, the fact that sky waves are less stable than ground waves does not directly depend on the variations in the ionosphere. The instability of sky waves is more related to the unpredictable nature of their propagation rather than solely on ionospheric conditions.

### Final Conclusion
- Both statements are true, but Statement 2 does not serve as a correct explanation for Statement 1. Therefore, the best choice is that Statement 1 is true, Statement 2 is true, but Statement 2 is not a correct explanation of Statement 1.