CLEAN : Coronavirus survivors donate plasma in New Delhi

The video introduces the concept of 'surface' and includes a brief greeting.

What is the main topic introduced in the first section of the video?

• Density

• Surface

• Mass

• Volume

Which word is repeated at the beginning of the video?

• Introduction

• Hello

• Surface

• Goodbye

What is the first word spoken in the video?

• Hello

• Greetings

• Surface

• Welcome

What is the final word spoken in the video?

• Hello

• Goodbye

• End

• Surface

What is the purpose of the second section of the video?

• To ask questions

• To greet the audience

• To provide a summary

• To introduce a new topic