Which is the correct shadow of the bird?

You measure my life in hours
I serve you by expiring
I vanish faster when I am thin
and slower when I am thick
The wind is my energy
What am I?

Which is faster, Heat or Cold ? Explain.

An express train takes 3 seconds to enter the tunnel which is 1 km long.
If it is travelling at 120 km an hour, how long will it take to pass completely through the tunnel?

A seven-year-old kid challenged his classmates that he can make the number one disappear by adding something to it.

How can he do that?

When we see 2 but call 10?

John and Jill are madly in love with each other. To remind Jill of his pure love, John wants to send her a ring by post but in their country where burglary is quite prominent, any package that is not locked comes under the risk of being stolen for the contents.

John and Jill possess many padlocks but neither one of them has the other key.

Can you find a way John can send the ring to Jill safely?

Outside a massage parlour, there is a board that reads
"I only massage those who do not massage themselves."

Reading the above statement, does the masseur massage himself?

What can you deduce from the following BrainBat?

CRY
LMKI

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?