I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

There are 20 people in an empty, square room. Each person has full sight of the entire room and everyone in it without turning his head or body, or moving in any way (other than the eyes). Where can you place an apple so that all but one person can see it?

Which tank will fill first?

Can you identify the direction in which this bus is moving; left or right?

Hint: The bus is moving on the roads of London.

A 52% bias toss for head using the 51% tail bias coin was done to obtain a fair result.

Can you find how bias is the floor in this case?

You have two buckets of 11 liters and 6 litres.
How can you measure exactly 8 litres?

Open a Laptop which is password protected. Hint for the password is given as below:

1 mobile 3 books 2 Boards 1 night 4 balls 2 lighters 1 ghost 1 hat 3 watches

Can you find out what is missing?

1 3 5
2 4 ?

Hint: It's not six. Think out of the box.

Eight of us go fourth, not back, to protect our king from an attack. What are we?

There are 2 cops parked along a one-way street looking for traffic violations. They spot a taxi driver going in the wrong direction, yet they do nothing.

Why?