Answer:
I am million people's wakeup call. What am I?
I can be found in seconds, minutes and centuries, but not in days, years or decades.
What is often on the ground getting stepped on by others, but you donโt have to wash it because it never get dirty, in fact you couldnโt wash it even if you tried?
There is 10 birds on a branch, a man shot 5 of them. How many were left?
What goes up but never comes down?
I am a room that has a roof but no walls. What am I?