You need to move three matchsticks to form three squares. Can you do it?

I know a ten-letter word in the English language which can be typed using only the top rows of the computer keyboard.

Can you move 2 matchsticks to form four equal sized squares.

Can anyone tell me a word in the English dictionary which has a silent 'z'?

This is a most unusual paragraph. How quickly can you find out what is so unusual about it? It looks so ordinary, you'd think nothing was wrong with it. Actually, nothing IS wrong with it. But it is not as ordinary as you might think. If you think about it for a bit, you will find out why it is truly so unusual. So what is it? What is so unordinary about this paragraph?

No matter how little or how much you use me, you change me every month. What am I?

An express train takes 3 seconds to enter the tunnel which is 1 km long.
If it is travelling at 120 km an hour, how long will it take to pass completely through the tunnel?

One night, a man runs away from home. He turns left and keeps running. After some time he turns left again and keeps running. Later, he turns left one more time and runs back home—but when he gets home, he finds a man in a mask. Who was the man in the mask?

John was working on a Chemical Mixture whose weight comprise 90% liquid and 10% solid. The total weight of the mixture is 20 pounds. After a while, John noticed that some of the liquid evaporated and now the liquid comprises just 50% of the weight.

What is the weight of the chemical mixture now?

I am soft and cuddly that soothe your heart. But, If you pick my last name I am going to tear you all apart. Who am I?