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

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

You have four chains. Each chain has three links in it. Although it is difficult to cut the links, you wish to make a single loop with all 12 links. What is the fewest number of cuts you must make to accomplish this task?

What is the difference between a jeweller and a jailer?

Analyze and find the missing item in the sequence:
16, 06, 68, 88, __, 98

I am green and found in the forest and have needles instead of leaves. What am I?
Hint 1: It can be used for Christmas decorations.
Hint 2: I have a strong, scent that is used in air fresheners.

What is the centre of gravity?

If,

A + B = C
D - C = A
E - B = C

Based on the above equations, find out the answer for:

D + F = ?

Akbar called Birbal and asked him to draw a line on the floor. He asked Birbal to make that line smaller without erasing it. Birbal smiled and did it before Akbar could blink his eyes.

How did he managed to do it?

When monkey rotate the gear, which mark will be hit 1 or 2 ?