It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?

I’m light as a feather, yet the strongest person can’t hold me for five minutes. What am I?

I am the largest in my family of fifty.
The youngest of our family lives separately from the rest of the family and so do I.
I am regarded as harsh and tough.
I am so large, you cut me in two equal halves,
each half would still be larger than the second largest member of the family.
Who am I?

You are presented with three boxes. One of them has a red ball inside and the other two have a black ball inside each of them. You are asked to pick up the one with red ball and you pick one. Now, one of the other boxes is opened and it is found to have a black ball.

You are presented with a chance to change your box with the one that is left closed. Will you change your box? Why or why not?

Ten coins have been arranged as you can see in the given picture. In this arrangement, a triangle is formed pointing upwards. You have to invert the position of the triangle and make it point downwards while changing the position of 3 coins only. Can you do it?

Can you count the number of seconds in a year?

Clue: You need to bother about calculation.

What does below chemistry rebus means?

First, think of the colour of clouds. Next think the colour of snow. Last, think of the colour of the moon. Now, what do cows drink?

I am a white box having no key or lid.
Yet there is a golden treasure inside it.

What Am I?

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