What goes up but never comes down?

what does the below rebus mean?

What has one letter and starts with an E?

In this image, you can see three almost identical Doraemon images. Can you spot the odd one out from them?

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

There is something which is always coming but never arrives?

What is harder to catch the faster you run?

You find yourself in a strange place guarded by two guards.One of the guard always say truth while other always lies.You don't know the identity of the two.You can ask only one question to go out from there. What should you ask?

Can you solve this tricky maths equation problem by replacing it? mark with the correct symbol?

19834 -----: 187
15921 -----: 153
17561 -----: 139
13734 -----: ???

Yesterday I fell from 30 feet high ladder but I don't get hurt. Why?