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?

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

The following four words might seem abrupt to you. But you can make them meaningful by just adding vowels.
RDSH
GGPLNT
TMT
NN

Hint: All of them are vegetables.

In the given figure, move three matchsticks so that the resulting figure contains two rectangles.

What is harder to catch the faster you run?

Can you place six X (crosses) in below board without making three in a row in any way ?

Replace the question mark with the correct number in the below-given picture?

Which is the correct shadow of the bird?

How many bricks does it take to complete a building that is 15 feet wide, 30 feet deep, and 12 feet tall made of brick?

The horse jumps over the king.
Strangely there is absolutely no scratch on him.

Can anyone explain, how is this possible?