There is one thing that goes round the house and also inside the house but never even share a brief touch. What is it?

Two girls were born to the same mother, on the same day, at the same time, in the same month and year and yet they're not twins. How can this be ?

The first box has two white balls. The second box has two black balls. The third box has a white and a black ball.

Boxes are labeled but all labels are wrong!

You are allowed to open one box, pick one ball at random, see its colour and put it back into the box, without seeing the colour of the other ball.

How many such operations are necessary to correctly label the boxes?

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

Who am I?

I have branches, but no fruit, trunk or leaves. What am I?

Begin with a word, five letters to my name,
Remove the first and last but I am the same
Take out my middle and still, I remain.
What word am I?

If you drop a 15 kg iron bar and a 5 kg bag of cotton from a height of 50 meters which will reach the ground first?

Which five letter word can be added at the end of below word to form a
valid word?

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I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

If Rajina's daughter is my daughter's mom, who am I to Rajina?