Understanding ISRO Satellite Launch Records
This question asks us to identify which two satellites from the provided list, along with their launch dates, failed to reach their intended orbit. We need to examine the success or failure status of each listed ISRO satellite.
Analyzing Satellite Launch Success
Let's review the status of each satellite mentioned:
- A. GSAT-2: Launched on 8th May, 2003. This satellite was successfully placed into orbit and served its purpose.
- B. GSAT-4: Launched on 15th April, 2010. This satellite experienced a launch failure; the GSLV-F06 rocket carrying GSAT-4 malfunctioned and failed to place the satellite into orbit.
- C. GSAT-5P: Launched on 25th December, 2010. Similar to GSAT-4, the launch vehicle (GSLV-F07) carrying GSAT-5P failed during ascent, resulting in the loss of the satellite.
- D. GSAT-12: Launched on 15th July, 2011. This satellite was successfully launched using a PSLV rocket and placed into its intended orbit.
Identifying Failed Missions
Based on the launch records:
- GSAT-2 was successful.
- GSAT-4 failed.
- GSAT-5P failed.
- GSAT-12 was successful.
Therefore, the two satellites that failed to reach the orbit are GSAT-4 and GSAT-5P.
Matching Failures to Options
The options provided are combinations of the satellites:
- Option 1: A and B
- Option 2: B and C
- Option 3: C and D
- Option 4: D and A
Since GSAT-4 (Satellite B) and GSAT-5P (Satellite C) are the ones that failed, Option 2 correctly identifies these two satellites.
Summary Table
| Satellite | Launch Date | Launch Status |
| GSAT-2 | 8th May, 2003 | Successful |
| GSAT-4 | 15th April, 2010 | Failed |
| GSAT-5P | 25th December, 2010 | Failed |
| GSAT-12 | 15th July, 2011 | Successful |
