What does the below rebus riddle means?

What can go up a chimney down, but can't go down a chimney up?

John has played 50 ODI's and his average is 50. How many runs should he score in his 51st ODI, so that his average score jumps to 51?

If you read clockwise, you can form a word by inserting three missing letters in the picture given below. Can you do it?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

Can you find the missing piece of the Porsche?

Find the number of squares in the below picture

Which wheel of car does not rotate when you turn your car right?

In the formation, you can see a few arranged matchsticks. Can you form three squares by moving just three matchsticks?

Why do people go to bed?