What does an Island and the letter T have in common?

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

Find the hidden panda in the image below.

What does this rebus mean?

O
N
C
E
TIME

Find the mistake in the below maths equations

A = 2
A(A-1) = 2(A-1)
A2-A = 2A-2
A2-2A = A-2
A(A-2) = A-2
A = 1

Below, you will find the mathematical proof that 10 equals 9.99999?. But is that possible or there is something wrong about it? Can you find the error?

x = 9.999999...
10x = 99.999999...
10x - x = 90
9x = 90
x = 10

If your uncle’s sister is not your aunt, what relation is she to you?

I am a ten letters word
The first four letters have the power to rule,
Next, four-letter can be eaten.
The next three-letter represents a lady.
I can fly as well

what am I looking for?

What have one eye but still cannot see?

In this image, you can see three almost identical Doraemon images. Can you spot the odd one out from them?