How many times do a clock's hands overlap in a day ?

There are two candles. Both will only burn exactly for an hour. How will you use these two candles to measure forty-five minutes?

In which direction should the missing arrow point?

Which wheel of car does not rotate when you turn your car right?

Most people think of me as money. But when they find me in the water, they won’t get any money out of me. What am I?

I have an eye but still cannot see.

Who am I?

In front of you, there are 9 coins. They all look absolutely identical, but one of the coins is fake. However, you know that the fake coin is lighter than the rest, and in front of you is a balance scale. What is the least number of weightings you can use to find the counterfeit coin?

The following four words might seem abrupt to you. But you can make them meaningful by just adding vowels.
RDSH
GGPLNT
TMT
NN

Hint: All of them are vegetables.

Two guards were guarding the camp.Guard-1 was looking towards the south to make sure no threat is coming from the road.Guard-2 was looking at the north to make sure no threat is coming from the top. Suddenly Guard-1 ask the Guard-2 why he is smiling?How Guard-1 knows that Guard-2 is smiling?

If you say my name, I will no longer exist. What am I?