What does this rebus mean?

O
N
C
E
TIME

Find the missing letter in the last circle logically in the given below picture.

What Deficiency does the below rebus represent?

VIT_MIN

I had an infinite supply of water and 5 litres and 3 litres jars.

How would you measure exactly 4 litres in the least number of steps?

On rolling two dices (six-sided normal dice) together, what is the probability that the first one comes up with a 2 and the second one comes up with a 5?

To tease, King Akbar told his most clever advisor Birbal to give his daughter one thing that she can eat when hungry, drink if she feels thirsty and can burn if she feels cold. King Akbar was shocked when Birbal gave Akbar's daughter one such thing that satisfies all of the above.

What did Birbal give to Akbar's daughter?

No matter how little or how much you use me, you change me every month. What am I?

Which is the correct shadow of the bird?

I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. What am I?

If a zookeeper had 100 pairs of animals in her zoo, and two pairs of babies are born for each one of the original animals, then (sadly) 23 animals don’t survive, how many animals do you have left in total?