What occurs twice in a week, once in a year but never in a day?

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

Yesterday I fell from 30 feet high ladder but I don't get hurt. Why?

There is a place where if I stand up straight, I will still be considered sideways.

Things are just as they seem, right? Well, check again.
Can you count the number of tigers in this picture ?

In a competitive exam, each correct answer could win you 10 points and each wrong answer could lose you 5 points. You sat in the exam and answered all the 20 questions, which were given in the exam.
When you checked the result, you scored 125 marks on the test.

Can you calculate how many answers given by you were wrong?

Find the next number in the following series:
6, 14, 26, 98, __?

A 52% bias toss for head using the 51% tail bias coin was done to obtain a fair result.

Can you find how bias is the floor in this case?

One day, John and his friends were playing around. Jacob hit something with a Pin and it popped. John's dad came into the room that very moment, but he wasn't mad. In fact, he was smiling. What did Jacob hit?

I am something people love or hate. I change peoples appearances and thoughts. If a person takes care of them self I will go up even higher. To some people I will fool them. To others I am a mystery. Some people might want to try and hide me but I will show. No matter how hard people try I will Never go down. What am I?