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

Make eight squares by moving only two matchsticks.
Note- Square can be of different sizes.

In the given figure, move three matchsticks so that the resulting figure contains two rectangles.

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

There are forty elephants and they have forty-fore heads. How can this be possible?

Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

When we see 2 but call 10?

One night, a woman receives a call from the police. They tell her that her husband was murdered and that she should come to the crime scene as soon as possible. The woman drops the phone, shocked, and drives 20 minutes to the crime scene. As soon as she reaches the crime scene, the police arrest her and she is convicted of murder. How do the police know she committed the crime?

There is a barrel with no lid and some wine in it. 'This barrel of wine is more than half full,' said Curly. 'No it's not,' says Mo. 'It's less than half full.' Without any measuring implements and without removing any wine from the barrel, how can they easily determine who is correct?

I have a mouth but I don't eat.
I have a bank but have no money.
I have a bed but i dont sleep.
I wave but have no hands.

Who Am I ?