I am a type of room you cannot enter or leave. Raised from the ground below, I could be poisonous or a delicious treat. What am I?

In the picture that is attached with this question, you can find a square which comprises of four little squares inside it. Consider this square to be made with matchsticks. You have to remove two matchsticks such that only two squares remain instead of five.How will you do it ?

Christina is practising her dance steps along with her friends. In a particular sequence, all of them form a row. At that point, Niharika is standing in the 4th position from either end of the row.
Can you find out how many girls are practising together?

What does this simple rebus mean?

In this image, you can see three almost identical Doraemon images. Can you spot the odd one out from them?

My location can be determined by the below rebus.
So where am i ?

Which is faster, Heat or Cold ? Explain.

When can we add 2 to 11 and get 1 as the correct answer?

I add 5 to 9 and get 2. The answer is correct, so what am I?

Can you complete the sequence puzzle?

AR TA GE CA LE VI LI _