Only one colour, but not one size,
Stuck at the bottom, yet easily flies.
Present in sun, but not in rain,
Doing no harm, and feeling no pain.
What is it?

My first is in chocolate but not in ham. My second is in cake and also in jam. My third at tea time is easily found. Altogether, this is a friend who is often around. What is it?

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?

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

A 3 digit number is such that it's unit digit is equal to the product of the other two digits which are prime. Also, the difference between it's reverse and itself is 396.

What is the sum of the three digits?

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?

I cannot talk, but I always reply when spoken to. What am I?

Forwards I am heavy, backward I am not. What am I?

A father's child, a mother's child, yet no one's son.

Who am I?

In the given figure, you can see that four match sticks are used to form a square. Can you form five squares by using six matches?