Can you convert the number zero(0) into a positive number using just one mathematical operator ?

Before Mount Everest was discovered, what was the highest mountain in the world?

During an experiment, a guy throws a bouncy ball from a 100 feet tall building. The ball has a specific characteristic. Every time it hits the ground, it bounces up halfway.

How many bounces do you think the ball will make before it comes to a stop ?

I am a five-letter word and comprises two different vowels and three same consonants. I am so strong that I can spoil your entire work.

Can you find out who am I?

Can you solve the tricky chess rebus puzzle below by ciphering the hidden meaning?

Christina is older than Kareena and Karishma. Katrina is older than Karishma and younger than Kareena. If Kareena has a brother named John, who is older than Christina, who's the youngest?

Below is the sum of symbols in each row and column in the figure. Analyzing the figure, can you find out the value of the symbols?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see?

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

Make eight squares by moving only two matchsticks.
Note- Square can be of different sizes.