Spot what is wrong here in below Picture?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

In the given figure, move three matchsticks so that the resulting figure contains two rectangles.

Which tank will fill first?

If Rajina's daughter is my daughter's mom, who am I to Rajina?

When 99 is considered higher than 100?

It has a long neck, A name of a bird, Feeds on cargo of ships, It's not alive,

What is it?

There are a number of books on a shelf. If one book is the 4th from the left and 6th from the right, how many books are on the shelf?

Look at the below sequence of letters and tell us what the next letter should be:

O T T F F S S ?

In the picture given below, can you find out which digit will take place of the question mark?