What number comes next in the series?

5 15 5 18 5 24 14 20 _

I am a type of food that is often found in the fridge and can be white in colour. What I am?
Hint 1: I am a dairy product.
Hint 2: You can spread me on the bread.

How can you tell a raw egg from a hard-boiled egg?

You need to complete the maze by entering from the entrance marked below in the figure near the yellow circle, bottom left and leaving from the exit point near the green circle, bottom middle.

Rule of Game: You can move only by exchanging green and yellow circles.

What's the next in the series?

H, Be, F, S, Mn, Kr, In, Gd, Tl, ?

John drives to his office at 20km/hr. After reaching the office, he realizes that today is a holiday. He went back at an average speed of 30km/hr. Discounting the time spent in the stoppage what was the average speed of his journey?

The more of this there is, the less you see. What is it?

I know a nine-letter word having only one vowel.
Do you ?

Which of the following words don't belong in the group and why?
CORSET, COSTER, SECTOR, ESCORT, COURTS

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