To download the Board Paper of Class 10 2019 Science Delhi (Set - 1), you can follow the steps provided below:

Step 1: Visit the official website of EduRev
- Open your web browser and go to the EduRev website. (Remember not to promote any other website other than EduRev)

Step 2: Find the Class 10 Section
- Look for the section dedicated to Class 10 resources on the EduRev website. This section should provide access to various study materials, including board papers.

Step 3: Navigate to the Science Subject
- Once you are in the Class 10 section, find the subject "Science" and click on it. This will take you to the Science study materials page.

Step 4: Search for the Board Paper
- On the Science study materials page, look for the specific board paper you are interested in, which is "Board Paper of Class 10 2019 Science Delhi (Set - 1)".

Step 5: Download the Board Paper
- When you have located the desired board paper, click on the download button or link provided next to it. This will initiate the download process, and the board paper will be saved to your device.

In summary, to download the Board Paper of Class 10 2019 Science Delhi (Set - 1) from EduRev, you need to visit the EduRev website, navigate to the Class 10 section, find the Science subject, search for the specific board paper, and then download it using the provided download button or link.

Remember to always access study materials from reliable sources, and EduRev is a reputable platform for accessing academic resources.

Thanks.