Solution:

Both 3 and 4th

Explanation:
- The water in tank1 will get filled up to the connectivity of tank1 and the tank2 and then it will start flowing to tank2.
- The water in tank2 will get filled up to the connectivity of tank2 and the -tank3 and then it will start flowing to tank3.
- The water in tank3 will get filled up to the connectivity of tank2 and the tank3 and then it will start flowing to tank3.
- As the outlet of tank3 and inlet of tank4 are not at the same level, water will continue to fill tank3 till the inlet of tank4.
- Now both the tank3 and tank4 fill simultaneously until both fill together.

Solution:

Move: 1
White moves the knight to any position.

Move: 2
Black moves the pawn to position shown in the picture

Move: 3
White moves the knight back to original position.

Solution:

It can be down as shown below.

Solution:

Catch Me If You can

Explanation:
Picture 1: "Cat"
Picture 2: "ch" (China - Ina)
Picture 3: "Me" (Me icon)
Picture 4: If (Gif icon - G, we removed G as 1 is cut off)
Picture 5: "You" (it is pointing towards You)
Picture 6: Can (picture of can)

Solution:

5 and 9.

Solution:

Pit Stop C

Solution:

Sherlock Holmes

Explanation:
She + R + Lock + Home

Solution:

Owl.

It's circled in the image below.

Solution:

South

Explanation:
If you turn the picture upside down, you will see South.

Solution:

A parrot can be spotted as circled in the image below.