Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

How is a fly different from a mosquito?

What does this rebus picture identify?

I never was there, I am always to be.
You have never ever seen me, not ever you will.
Yet I am the confidence of everyone.

Who Am I?

What is so fragile that saying its name breaks it?

I am the fastest animal but cannot climb the tree. What am I?

Sachin bought a car with a strange 5 digit numbered plate.The water image of the number is 78633 more than my car number. All the digits of car number are distinct.

What is the original number on number plate?

What is the word or phrase?

You knock a Table over in the library, and suddenly 20 eyes are looking at you.

Can you count the number of quadrilaterals in the picture below?