By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

If an electric train is travelling south, then which way is the smoke going?

Nodes are shown below and you need to connect them based on the following rule: Every node can be connected to the number of nodes inside them, i.e. the first node there is a value of 1 which indicates that the first node can connect to exactly one node only.Can you do it?

John was visiting his friend Jacob. He found out that his friend's wife had just killed a burglar in self-defense.
John asks Jacob about what happened and he told that "His wife was watching television when suddenly the bell rang. She thought that it is her husband Jacob but she found the burglar who attacked her instantly and she got so frightened that she killed the burglar immediately with the knife.
John asked the police to arrest his friend's wife. Why?

Can you find the key in the picture below?

On my way to St. Ives I saw a man with 7 wives. Each wife had 7 sacks. Each sack had 7 cats. Each cat had 7 kittens. Kittens, cats, sacks, wives. How many were going to St. Ives?

In the given picture, in how many ways can you read the word "Tiger"?

Here is a mathematical expression that also secretly tells a movie name. What movie is that?

Look at the picture and find out which square is not linked with any of the other squares.

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