What goes up but never comes down?

They are three errirs in this question. Can you find them?

What is the riddle which can be asked all day with a different correct answer each time.

If it took eight men ten hours to build a wall, how long would it take four men to build it?

How many bananas can you eat if your stomach is empty?

Can you find out the missing number in the grid?

Find the next number in the series

12, 20, 40, 72, 116, 172 ?

I go up and I go down.
I go up towards the beautiful sky and down toward the green ground.
I am present tense.
I am past tense too
Children love me.

Who Am I?

What does this rebus picture identify?

Christina is older than Kareena and Karishma. Katrina is older than Karishma and younger than Kareena. If Kareena has a brother named John, who is older than Christina, who's the youngest?