What is black when you buy it, red when you use it, and gray when you throw it away?

You are given a cube that is made with the help of 10x10x10 smaller cubes summing up to a total of 1000 smaller cubes. You are asked to take off one layer of the cubes.
How many remain now?

Can you divide the below-given shape into four equal and identical pieces?

How much will a 38° angle measure when looked at under a microscope that magnifies ten times?

A girl was sitting in her hotel room when she heard a knock on the door. She opened the door and found that a man was standing outside. The man said, "Oh! I am really sorry, I thought this was my room." He then walked through the corridor to the elevator. The girl did not know the man. She closed her door and called security asking them to apprehend the man. What made her suspicious of that man? He might have been genuinely mistaken.

If in a code language, DISTANCE is written as IDTUBECN and DOCUMENT is written as ODDVNTNE, the how will THURSDAY be coded as in the same language?

You can see it everyday, But cannot touch it at will. What is it?

How can you tell a raw egg from a hard-boiled egg?

How many times in a given day, minutes and hour clock comes in a straight line ?

Can you find a five letter word that is left with only two letters if one is removed?