By what process could you make a 'Tea-Table' into food?

I came first on earth but second on the heaven.
I also came twice in a week but found just once in a year.
I stay away from months but you can find me in February.

What am I?

Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

Prove that the below maths equation is true.

8 + 8 = 91

Can you decipher the below rebus?

PBLUESAISNUERSES

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

There was an aeroplane crash, every single person died, but two people survived. How is this possible?

I know a nine-letter word having only one vowel.
Do you ?

The teacher told the student that if he told a lie then he will be expelled from school and if he told the truth then he still is expelled from school.

What can a student say to prevent his being expelled from school?