There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

Nine marbles are arranged in the image below. Can you slide two marbles to form a square?

We know that the number 7 is the prime followed by a cube. Which next number is also a prime followed by a cube?

What number when divided in half becomes zero?

What does this rebus mean?

O
N
C
E
TIME

You throw me out when you want to use me and you take me in when you don't want to use me.

Who Am I?

What you cannot hold but it is yours?

What is the centre of gravity?

The doctor prescribed you to take one pill from the bottle every half an hour. The bottle is now left with only three pills.

How long do you think you have before you run out of pills?

In a jungle where there are no street lights or any other artificial source of lights, I notice a black snake crossing the road.
How did I get sight of the snake?