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

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?

I have a five and a three-gallon jar. Assuming there is an infinite supply of water, how can I measure one-gallon water?

What is the difference between a jeweller and a jailer?

There is a shop where written:
Buy 1 for $1
10 for $2
100 for $3
I needed 999 and still only paid $3. How could this be financially viable for the shop-keeper?

In particular commonwealth games, a female participant won silver and gold medals for a single event.

How can this be possible?

Find the next number in the sequence

1, 2, 6, 21, 88, __?

There once were seven dwarfs who were all brothers. They were all born two years apart. The youngest dwarf is seven years old. How old is his oldest brother?

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?

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?