Explanation:

- The correct answer will identify the one-hour slot on Doordarshan National channel, initiated by the Department of Science and Technology in cooperation with Doordarshan.

- Option 1: DD Science

- This is aimed at showcasing scientific achievements, ideas, and promoting a scientific outlook through television.

- Correct Answer

- Option 2: Indian Science

- This might sound relevant but does not specifically refer to the one-hour slot on Doordarshan.

- Option 3: Science Live

- This name suggests the possibility of real-time scientific programming but does not correspond to the initiative mentioned.

- Option 4: National Science

- While sounding plausible, it does not match the official name of the program either.