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

Manish and Manoj play 5 games of chess.
Both Manish and Manoj win the exact same number of games. There is no tie at all.

How?

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

Can you fill the blank with the correct number?

6 30 870 756030 _____

People put me on the table and cut me but do not eat me. What am I?

I cannot talk, but I always reply when spoken to. What am I?

Find the missing number in the image below.

You’ll find me on Mercury, Earth, Mars, Jupiter, Saturn, and Uranus. But never Neptune, or Venus. What am I?

There are nine dots in the picture that has been attached with this question. Can you join all the dots by drawing four straight lines without picking up your pen?

Move four matchsticks to the below square to form three squares?