Best riddles for teens

Physicists have built devices to move me very fast. My last seven letters can be commonly found in newspapers, magazines and journals. What am I?

Which vehicle is spelled the same forwards and backwards?

Some people prefer them with raisins Some like them to contain chocolate chips Whichever kind of these you like though They don't last long once they've passed your lips What are they?

I am a nut with a whole. What am I?

I am the building with number stories. Find me who am I?

Why do birds fly south in the Fall?

I am a 5 letter word. Take away the first letter and I am a country's name. Take away the first two letters and I become the opposite of the 5 letter word. Who am I?

In a new Engineering Hostels they have 100 rooms. Ankit Garg was hired to paint the numbers 1 to 100 on the doors. How many times will Ankit have to paint the number eight ?

I can fly but I have no wings. I can cry but I have no eyes. Wherever I go, darkness follows me. What am I?

Everyone has it and no one can lose it, what is it?