81 x 9 = 801. What must you do to make the this equation true?

I have four wings but can't fly.
I express no emotions.
I am found on the exact spot every time you look.
I keep toiling away with a little sound.

Do you know what am I?

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

Cristina was born in 1888. She just had her 30th birthday today how did that happen?

The host of a game show, offers the guest a choice of three doors. Behind one is a expensive car, but behind the other two are goats.
After you have chosen one door, he reveals one of the other two doors behind which is a goat (he wouldn't reveal a car).

Now he gives you the chance to switch to the other unrevealed door or stay at your initial choice. You will then get what is behind that door.

You cannot hear the goats from behind the doors, or in any way know which door has the prize.

Should you stay, or switch, or doesn't it matter?

They are three errirs in this question. Can you find them?

That attorney is my brother, testified the accountant.

But the attorney testified he didn't have a brother.

Who is lying?

How many Watermelons are there in the below picture?

You have two buckets of 11 liters and 6 litres.
How can you measure exactly 8 litres?

Replace all '*' with digits 1, 2, 3, 4, 5 and 6 to make below statement true.

* *
x *
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* * *