QBurst Drupal Interview Questions

1. How do you reduce the size of css and js in Drupal?
2. How to get the id of a javascript element on click event?
3. Suppose you've a table named pen, with columns id, color, brand and count. Write a query to list the color of pens from highest to the lowest count?
4. Write the syntax to create a custom block?
5. What is an entity, entity type, field and properties?