Spot what is wrong here in below Picture?

What has a ring but no finger?

A number with an interesting property:

When I divide it by 2, the remainder is 1.
When I divide it by 3, the remainder is 2.
When I divide it by 4, the remainder is 3.
When I divide it by 5, the remainder is 4.
When I divide it by 6, the remainder is 5.
When I divide it by 7, the remainder is 6.
When I divide it by 8, the remainder is 7.
When I divide it by 9, the remainder is 8.
When I divide it by 10, the remainder is 9.

It's not a small number, but it's not really big, either.
When I looked for a smaller number with this property I couldn't find one.

Can you find it?

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

What can you see in the middle of March and April that you can never see in any other month?

Why do we preferably have round manhole covers and not square ones?

I have a head like a cat and feet like a cat, but I am not a cat. What am I?

Can you find the six hidden animals in the picture below?

A boy and a girl are sitting on the porch.
"I'm a boy," says the child with black hair.
"I'm a girl," says the child with red hair.
If at least one of them is lying, who is which?

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?