What goes up but never comes down?

Can you count the number of lines in the below picture?

Teacher ask the student

'Why are you standing on that chair in music class ?'.

what did student replied ?

I am under you when I am whole.
I shift above you if you remove the first letter.
I come all around you if you remove the second as well.

Can you tell me who I am?

If a shopkeeper can only place the weights on one side of the common balance. For example, if he has weights 1 and 3 then he can measure 1, 3 and 4 only. Now the question is how many minimum weights and names of the weights you will need to measure all weights from 1 to 1000? This is a fairly simple problem and very easy to prove also.

I look at you, you look at me, I raise my right, you raise your left. What am I?

Which Travels Faster? Solve below famous picture riddle:

Do You See It?

10+10 and 11+11 can give you the same answer.

Explain how?

Take away the whole and some still remain. What is it?