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

What occurs twice in a week, once in a year but never in a day?

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

I cannot talk, but I always reply when spoken to. What am I?

I am quite hot but become too cold if you remove the first two letters. What am I?

If,

A = 1

B = 2

C = 3

...

...

Z = 26.

Based on above rule, you need to find an eleven letter word whose letter sum is equal to 52.

There are three light switches outside a room. One of the switches is connected to a light bulb inside the room.
Each of the three switches can be either 'ON' or 'OFF'.

You are allowed to set each switch the way you want it and then enter the room(note: you can enter the room only once)

Your task is to then determine which switch controls the bulb?

What Time Should the last watch show in the below figure?

Mr Red Lives in the red house.
Mr Green Lives in the greenhouse.
Mr Yellow Lives in the yellow house.

Who lives in the Whitehouse?

Teacher ask the student

'Why are you standing on that chair in music class ?'.

what did student replied ?