What does this Rebus Picture means ?

Cristina leaves home and then she makes exactly 3 left turns and returns home where she found 2 girls wearing the mask.

Who are these two masked girls?

Take one out and scratch my head, I am now black but once was red. What am I?

Irene killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

John is the son of Jacob.
So,
Jacob is the_____of John's father?

Different lights make me strange by changing me into different sizes. What am I?

A patient was diagnosed with some ailment. He was given five different tablets to take at night at an interval of 15 minutes.

How long will it take the patient to consume all the five tablets?

John was a very careless driver, so his owner Jacob gave him an offer that he will get an incentive of Rs.30 for every bottle box he delivered without breaking it and he will be charged Rs.90 for every bottle box he broke. Jacob gave John 100 bottles-box to deliver. After delivery, Jacob paid John Rs.2400. How many bottles-box did John break?

By adding four matchsticks, can you divide the square shown in the picture into two equal parts?

Tell me the Hindi name of a Vegetable which if we remove 1st word will become a precious Stone and by removing the last word it will become a sweet eatable.