How can one talk without saying a single word?

What does below pictogram mean?

The first box has two white balls. The second box has two black balls. The third box has a white and a black ball.

Boxes are labeled but all labels are wrong!

You are allowed to open one box, pick one ball at random, see its colour and put it back into the box, without seeing the colour of the other ball.

How many such operations are necessary to correctly label the boxes?

Can you count the number of triangles in the given figure?

If you drop me I’m sure to crack, but give me a smile and I’ll always smile back. What am I?

My cousin lives in one story house in Antarctica. His house is made the of-of sandstone. what is the color of stairs?

Manish has to secure 40% marks to pass his B.tech final exams.
He got just 40 marks and failed by 40-marks.

What is the maximum marks?

If a wheel has 54 spokes, how many spaces are there between the spokes?

Which Burger Is Different in below image?

You need to arrange three 7 and mathematical symbols to form number 1?