I am first found in caves, now prolific online; I am a depiction, a drawing, a symbol, or sign. I will convey whichever mood you could wish; or for that matter, a fist, flask, or fish. What am I?

What is black when you buy it, red when you use it, and gray when you throw it away?

The centre of the third figure is empty. What digit should fit inside?

Find the hidden panda in the image below.

Which of the below owl is odd one out?

Find the next number in the series?
2, 12, 36, 80, 150, 252, 392, _ ?

What does this rebus mean?

O
N
C
E
TIME

I have Rs.50 and I spend it in the way as below.

If 1+9+8=1, what is 2+8+9?

What is the end of everything?