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?

What is the centre of gravity?

Can you find the odd number in the following five choices?

1) 482636
2) 259807
3) 865195
4) 104739
5) 391744

Suppose that you are trapped on the surface of a frozen lake. The surface is so smooth and ideal that there is no friction at all. You cant make any grip on the ice and no wind is blowing to help you out. You have just a mobile phone with you which has got no reception disabling you to call for help.

How will you plan your escape before you freeze to death on the frozen lake?

Can you find out the total number of triangles in the given figure?

What occurs twice in a week, once in a year but never in a day?

Which alphabet letter is a question?

What's the best place to go shopping in the ocean?

What does the following represent?

N N N N N N N

A A A A A A A

C C C C C C C

Remove two matchsticks to make the below equation correct.