What number when divided in half becomes zero?

Can you tell a 3D object that has just two surfaces?

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

What is the coolest letter in the alphabet?

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

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

A Club organizes a Running Race, and John, Jacob, Minda, and Tony participated.

The results are as follows

John beats Jacob
Minda beats Toni
Toni beats John

Who came first in the race?

I am the black child of a white father, a wingless bird, flying even to the clouds of heaven. I give birth to tears of mourning in pupils that meet me, even though there is no cause for grief, and at once on my birth, I am dissolved into air. What am I?

A boy was locked in a room by some robbers. All that is in the room is a piano, a calendar, and a bed. The room is locked from the outside. What does he eat, drink, and how does he escape and get out?

Manish has to secure 40% marks to pass his B.tech final exams.
He got just 40 marks and failed by 40-marks.

What is the maximum marks?