How many sides does a circle have?

I know a country, If you remove the last alphabet of its name, it will become a part of your body. Do you name it?

If you drop me I’m sure to crack, but give me a smile and I’ll always smile back. What am I?

Prove that twice of ten is the same as twice of eleven.

From a pack of 52 cards, I placed 4 cards on the table.

I will give you 4 clues about the cards:

Clue 1: Card on left cannot be greater than the card on the right.
Clue 2: Difference between the 1st card and 3rd card is 8.
Clue 3: There is no card of an ace.
Clue 4: There are no face cards (queen, king, jacks).
Clue 5: Difference between the 2nd card and 4th card is 7.

Identify four cards?

I have a five and a three-gallon jar. Assuming there is an infinite supply of water, how can I measure one-gallon water?

A shepherd had 18 sheep, out of which, all but ten died.

Can you tell us how many sheep was he left with?

Jenifer and Jesica are having a conversation.

Jenifer: I am definitely not over 30.
Jesica: I am 28 and you are surely 5 years older to me at least.
Jenifer: No, you are at least 29.

You are told that both of them are lying throughout in the conversation. Can you find their respective ages?

There are nine letters in the below-given diagram. You have to form a nine-letter word using these letters.

There were three women in all the swimming costumes!
One was happy and the other two were sad!
The happy one was crying and the sad ones were smiling.
Why was this?