What work can one never finish?

What number when divided in half becomes zero?

Can you divide the below-given shape into four equal and identical pieces?

Can you think of any three-dimensional shape that comprises of exactly two surfaces?

Can you find out the next digit in the following series ?

0, 0, 1, 3, 2, 6, 3, 9, 4, 12, 5, ?

Count the number of balls in picture below:

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?

If an electric train is travelling south, then which way is the smoke going?

What's the only room from which no one can enter or leave

What is always in front of you but can’t be seen?