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

I am lying and I always lie. Tell me whether I am lying or telling the truth.

I have four wings but can't fly.
I express no emotions.
I am found on the exact spot every time you look.
I keep toiling away with a little sound.

Do you know what am I?

Which is heavier: a ton of bricks or a ton of feathers?

A blonde put eyeliner on her head. Why?

A man is found dead in his bathroom naked with blood scattered all around him. The bathroom was locked from the inside and there is no trace of any struggle. There is nothing in the bathroom except his pant with the belt still around and his shirt. Also, the medic team can't find any incision in his body that may have been the reason behind so much blood loss.

The Police department is clueless regarding this murder mystery.
Can you?

I want to fill my bucket using both cold and hot water.
I have two taps for both cold and hot water. The hot water tap fills the bucket in exact 6 hours and the cold water tap fills the bucket in exact 4 hours.
I turn both of them simultaneously but I forgot to turn off another tap which removes the water out of the bucket. This tap can empty the bucket in 12 hours.

How Long will it take to fill the bucket?

How many minutes are there in Feb 2017?

Note: The shortest answer is the correct answer.

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

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

Who am I?