Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

Can you decipher the two rows to find the hidden word?

Can you find out the missing number in the grid?

Jenifer and Jesica are having a conversation.

Jenifer: I am definitely not over 30.
Jesica: I am 28 and you are surely 5 years older to me at least.
Jenifer: No, you are at least 29.

You are told that both of them are lying throughout in the conversation. Can you find their respective ages?

Find the missing number in the sequence below:

Can you name some countries which do not have the alphabet 'A' in them?

You are given 16 witch hats. The hats are divided in four different colours – red, blue, green and yellow. Every colour has been assigned to four hats. Now each of the hat will be glued with a label of an arithmetic sign – ‘+’, ‘-‘, ‘x’ or ‘/’. But you can label one sign only once on one colour. In such an arrangement, the hats can be uniquely defined by its colour and symbol.

Can you arrange all the 16 hats in a 4x4 grid in a fashion that no two rows and columns have a repetition of colour or sign?
We have arranged four hats in the below picture to assist you.

Can you name an animal whose killing cannot be performed without spilling your own blood?

I am the beginning of the end, and the end of time and space. I am essential to creation, and I surround every place. What am I?

Can anyone tell me a word in the English dictionary which has a silent 'z'?