How can you make number one disappear by adding something to it?

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

Find the hidden tiger in the given optical illusion ?

Solve the mathematical equation in the picture below.

I have some blue and red sock in my drawer. I have a total of 4 socks. I pick 2 socks and the chance that I get a pair of red socks is 1/2.

What is the chance of picking a pair of blue socks?

Can you count the number of seconds in a year?

Clue: You need to bother about calculation.

When can we add 2 to 11 and get 1 as the correct answer?

It's pretty hard to give up.
If you remove a part of it, you will be left with a bit.
Even if you remove another part, the bit still remains.
Remove one more and it still remains.

What is it?

What type of tree can I carry in my hand?

If we tell you that there is a relation between the numbers and letters in the given figure, can you analyze it and find the missing letter in the last box?