What does this rebus mean?

O
N
C
E
TIME

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

Can you place six X (crosses) in below board without making three in a row in any way ?

The first two letters signify a male, the first three letters signify a female, the first four letters signify a great, while the entire world signifies a great woman. What is the word?

What is the relationship between these matchstick pictures below?

Given that

(78)^9 = 6
And (69)^4 = 11

Can you find out

(99)^2 =?

(Note: This is Logical, not Mathematical)

Can you identify the famous TV character from the rebus below?

Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?

What is the difference between a jeweller and a jailer?

We have four gears with below features=> Both Gear A and D has 60 teeth=> Gear B has 40 teeth=> Gear C has 20 teeth=> Every two minutes, Gear B makes 25 full turns.What is the relative speed of Gear A and Gear B?