What question can you never answer yes to?

What month of the year has 28 days?

There’s a one-story house in which everything is yellow. Yellow walls, yellow doors, yellow furniture. What colour are the stairs?

In the image below, can you find the value of an angle(y)

Suppose we lay down two cups in front of you. One of the cups is filled with tea and the other one with coffee. Now we ask you to take a spoonful of tea and mix it with the coffee. At this moment, the coffee cup has a mixture of tea and coffee. You have to take that mixture (spoonful) and add it back to the tea.

Can you now tell if the cup of coffee has more tea or the cup of tea has more coffee?

Sherlock breaks into a crime scene. The victim is the owner who is slumped dead on a chair and have a bullet hole in his head. A gun lies on the floor and a cassette recorder is found on the table. On pressing the play button, Sherlock hears the message 'I have committed sins in my life and now I offer my soul to the great Lord' and followed a gunshot Sherlock smiles and informed the police that's its a murder.

Why did he think so?

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

Name one eight-letter word with 'kst' in the middle, 'in' the beginning, 'and' at the end.?

What does below Rebus mean ?

esgg sgeg gegs gsge

Until it is measured, not known. Yet how you miss it when it has gone. What is it?