An inspection by the superintendent of St. Joseph School was scheduled on the next day. The class teacher Jenifer knew that he would be asking questions from her class and she would have to choose a pupil to answer. To offer a perfect impression over him, the teacher explained certain instructions to the students to maximise the chances of getting correct answer every time.

What did she say to the students?

My thunder comes before the lightning; my lightning comes before clouds; my rain dries all the land it touches. What am I?

In which direction should the missing arrow point?

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

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

Can you find a five letter word that is left with only two letters if one is removed?

You knock a Table over in the library, and suddenly 20 eyes are looking at you.

John is selling fruits.
He sells grapes at $30, Dates $25, and a Wolfberry $45.
At what price does he sell fig?

PS: Logical Thinking

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?