You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

I make a loud sound when I’m changing. When I do change, I get bigger but weigh less. What am I?

Only one color, but not one size,
Stuck at the bottom, yet easily flies.
Present in sun, but not in rain,
Doing no harm, and feeling no pain.
What is it?

As shown in the picture below, we can see a boy hanging on the tree branch to save his life. There are various ways in which he can die like1. A snake hanging toward the right waiting to bite the boy.2. A roaring Lion near the tree.3. Two crocodiles are ready to attack if the boy reaches near water. The tree is chopped to some extent, so can fall as if he moves a lot. Can you give this boy an escape plan?

Count the number of balls in picture below:

Two girls were born to the same mother, on the same day, at the same time, in the same month and year and yet they're not twins. How can this be ?

Can you find a seven digit number which describes itself. The first digit is the number of zeros in the number. The second digit is the number of ones in the number, etc. For example, in the number 21200, there are 2 zeros, 1 one, 2 twos, 0 threes and 0 fours.

You see a mathematical expression in the picture. Can you think of a movie that this expression refers to?

Replace the question mark in the picture below.

I am a white box having no key or lid.
Yet there is a golden treasure inside it.

What Am I?