What is both possible and impossible at the same time?

What does this rebus mean?

O
N
C
E
TIME

Astrology starts with the alphabet A, Biology starts with B, Psychology with P and Limnology with L.

Can you find an "ology" that begins with a P?

Solve the equation in the image by looking at the pattern closely.

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

Which fur should we be getting from the Lion?

Akbar summoned Birbal out of anger.
He told him that he will have to face death.
He asked him to make a statement and if the statement is true he will be buried alive and if the statement is false, he will be thrown at lions.
After hearing Birbal’s statement, Akbar could do nothing but smile.
He gave him 5 gold bars and let him go.

What did Birbal say?

Can you identify if it's a murder or a suicide ?

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

Replace the question mark with the correct number in below Picture: