If 21x = 79x, what is the value of x?

I came first on earth but second on the heaven.
I also came twice in a week but found just once in a year.
I stay away from months but you can find me in February.

What am I?

Which English verb becomes past tense just by rearranging the letters?

I have branches, but no fruit, trunk or leaves. What am I?

In a supermarket, there is an intelligent glass pane before a refrigerating unit. This glass pane allows cherries and apples through it but does not allow grapes and Orange to pass through it.

Can you identify the rule that the glass pane is following?

Can you solve below mathematical equation?

2^1234 - 2^1233

Move three sticks of the spiral below to form a square.

What is the next shape from answers A, B, C, and D figure?

A boy and his father are caught in a traffic accident, and the father dies. Immediately the boy is rushed to a hospital, suffering from injuries. But the attending surgeon at the hospital, upon seeing the boy, says 'I cannot operate. This boy is my son.' How is this situation explained?

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?