What does below rebus means ?

When you stop to look, you can always see me. But if you try to touch me, you can never feel me. Although you walk towards me, I remain the same distance from you. What am I?

What's a single-digit number with no value?

Baseball bat and ball cost $100. If the bat cost $99 more than the ball, what is the cost of each?

It is always ahead of me yet I can never see it. What is it?

What has one letter and starts with an E?

Bay of Bengal is in which state?

It's a protector.
It sits on a bridge.
One individual can see directly through it, while others wonder what it hides.

What is it?

A father's child, a mother's child, yet no one's son.

Who am I?

How many pluses should we put between the digits of 987654321 to get a total of 99, and where?