Spot what is wrong here in below Picture?

I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?

A man was convicted of a minor offence in Akbar court. Akbar decided to give him a chance. He asked him to give a statement. If the statement is true, he will be killed by lions and if it is false, he will be killed by trampling of wild elephants.

The convicted person requested help from Birbal and since the crime was not a big one, Birbal decided to help him. Whatever Birbal suggested impressed Kabir and he let the convicted person go.

What did Birbal suggest to the person?

Railroad Crossing, look out for the cars. Can you spell that, without any R's ?

What is the next number?

77, 49, 36, 18 ?

Rearrange the letters in "new door" to make one word.

Complete the following series. It.s very logical:

1, 4, 5, 6, 7, 9, 11, __?

There’s a girl who has a large family. She has an equal amount of brothers and sisters, but each brother only has half as many brothers and sisters. What’s the correct amount of brothers and sisters?

Can you find out which number multiplied by itself will give the output as 12345678987654321?

In this image, you can see three almost identical Doraemon images. Can you spot the odd one out from them?