How is the moon similar to a dollar?

I have one of the three numbers: 1, 2, or 3 in my mind. I speak only truth. You can ask me just one question for which I will only reply in yes or no or don't know. What question will you ask from me so that you are able to know the number?

All Marigolds are flowers.
Few Flowers are used to make colors.
Therefore, some Marigold are used to make colors.

True Or False?

I make a loud sound when I’m changing. When I do change, I get bigger but weigh less. What am I?

When you stop to look, you can always see me. But if you try to touch me, you can never feel me. Although you walk towards me, I remain the same distance from you. What am I?

There is a shop where written:
Buy 1 for $1
10 for $2
100 for $3
I needed 999 and still only paid $3. How could this be financially viable for the shop-keeper?

In which direction should the missing arrow point?

O_er_t_o_

Complete the missing letters of the given word.

What is the last thing you take off before bed?

There is one thing that goes round the house and also inside the house but never even share a brief touch. What is it?