Q. The efficiency of a jet propulsion unit is generally high at altitudes of (Solved)
1. 7500 metres
2. 1000 metres
3. 5000 metres
4. 9000 metres
5. More than 10,000 metres
- e. More than 10,000 metres
1. 7500 metres
2. 1000 metres
3. 5000 metres
4. 9000 metres
5. More than 10,000 metres