Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

During which month do people sleep the least?

A word I know,
Six letters contain,
Subtract just one,
And twelve is what remains.

How many minutes are there in Feb 2017?

Note: The shortest answer is the correct answer.

Look at the picture and find out which square is not linked with any of the other squares.

Find the missing letter in the last circle logically in the given below picture.

Can you identify the hidden rebus in the image below?

Replace the question mark with the correct number in below Picture:

What Does this text mean:

important=important

How can you leave a room with two legs and return with six legs?