Can you name any English verb that becomes its past tense by simply rearranging the alphabets ?

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

An American nightclub called 'The Coconut Grove' had a terrible fire in which over 400 people died. A simple design flaw in the building led to a high death toll. Subsequently, regulations were changed to ensure that all public buildings throughout the country eliminated this one detail, which proved deadly. What was it?

What is always in front of you but can’t be seen?

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

I am lying and I always lie. Tell me whether I am lying or telling the truth.

In the image below, can you find the value of an angle(y)

John and his team plan to rob a safe. They got just one chance to break the code else the local police will be informed. Below are clues:
A) Exactly one number is perfectly placed: 9 8 1
B) Everything is incorrect: 9 2 4
C) Two numbers are part of the code of the safe but are wrongly placed: 0 9 3
D) One number is part of the code of the safe but is wrongly placed: 1 4 7
E) One number is part of the code of the safe but is wrongly placed: 7 8 3

I’m light as a feather, yet the strongest person can’t hold me for five minutes. What am I?

In a football game, Christina defeated Teresa by 2 - 0 but no man from either side scored. How can this be possible?