What goes up but never comes down?

What does this rebus mean?

O
N
C
E
TIME

Analyze and find the missing item in the sequence:
16, 06, 68, 88, __, 98

Solve the alphametic puzzle by replacing the alphabet with the number.

S T O R M +
S O L E S
=========
T O W E L
=========

You have a roll of cloth 1km long. You have a machine which cuts this roll into pieces of 10-meter-long cloth.

How long would it take for the machine to cut the roll if each cut took 4 secs?

If you toss a coin 10 times and it lands heads up every time, what are the chances it will land heads up if you toss it again?

A thief enters a store and threatens the clerk, forcing her to open the safe. The clerk says, “The code for the safe is different every day, and if you hurt me you’ll never get the code.” But the thief manages to guess the code on his own. How did he do it?

What does the below image rebus riddle means ?

You need to remove two matchsticks to make the below equation true. Can you do it ?

The answer I give is yes, but what I mean is no. What was the question?