How is the moon similar to a dollar?

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?

How can one talk without saying a single word?

Can you name an animal whose killing cannot be performed without spilling your own blood?

Which Number is the odd one out?

A) 7145
B) 2716
C) 5321
D) 4135

On a bright sunny day, two fathers took their son fishing in the lake. Each man and son were able to catch one fish. When they returned to their camp, there were only three fishes in the basket. What happened?

PS: None of the fish were eaten, lost, or thrown back.

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

It's a test that will check your IQ.

Suppose you have one 11 minute hourglass and one 13 minute hourglass.

Can you measure exactly fifteen minutes using them ?

13 decks of cards have been mixed. What is the minimum number of cards that must be taken out from the above-mixed cards to guarantee at least one 'four of a kind?

I have lakes with no water, mountains with no stone and cities with no buildings. What am I?