Name one eight-letter word with 'kst' in the middle, 'in' the beginning, 'and' at the end.?

Solve below rebus puzzle?

Two guards were on duty outside a barracks. One faced up the road to watch for anyone approaching from the North. The other looked down the road to see if anyone approached from the South. Suddenly one of them said to the other, "Why are you smiling?"

How did he know his companion was smiling?

What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

What does the following represent?

N N N N N N N

A A A A A A A

C C C C C C C

In the four images below, can you find the odd one out?

What does below Rebus mean ?

esgg sgeg gegs gsge

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 ?

Andrew’s doctor gives him three pills and tells him to take one every half hour. How much time will have passed by the time Andrew’s taken all three pills?

I am a five-letter word and comprises two different vowels and three same consonants. I am so strong that I can spoil your entire work.

Can you find out who am I?