What question can you never answer yes to?

Buy me, smell me or deliver me, I do not change.

Who am I?

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

There is one four-digit whole number n, such that the last four digits of n2 are the original number n

There is a box in which distinct numbered balls have been kept. You have to pick two balls randomly from the lot.

If someone is offering you a 2 to 1 odds that the numbers will be relatively prime, for example
If the balls you picked had the numbers 6 and 13, you lose $1.
If the balls you picked had the numbers 5 and 25, you win $2.

Will you accept that bet?

When is the top of a mountain similar to a savings account?

If you read clockwise, you can form a word by inserting three missing letters in the picture given below. Can you do it?

A woman is sitting in her hotel room and hears a knock at the door. She opens the door to see a man whom she’s never met before. He says, “I’m sorry, I have made a mistake, I thought this was my room.” He then goes down the corridor and into the elevator. The woman goes back into her room and calls security. What made the woman so suspicious of the man?

If 24H in a D => 24 hours in a day.
What does "64S on CB" stand for?

Count the number of lines in the image below ?