What is so fragile that saying its name breaks it?

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

What number does the below three word/phrase identify and why?
1. Deck
2. Year
3. Singing in the Rain

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?

Use the digits from 1 up to 9 and make 100.

Follow the rules.
=> Each digit should be used only once.
=> You can only use addition.
=> For making a number, two single digits can be combined (for example, 4 and 2 can be combined to form 42 or 24)
=> A fraction can also be made by combining the two single digits (for example, 4 and 2 can be combined to form 4/2 or 2/4)

Question: how can we do this?

In a stable, there are men and horses. In all, there are 22 heads and 72 feet. How many men and how many horses are in the stable

Prove that twice of ten is the same as twice of eleven.

There is an English word that can be used up to four times in a row without modifying the spelling and form a valid grammatical sentence.

Do you know what word is that?

What word is identified by the below rebus?

Your Your Your Your Your
Your Your Your Your Your

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