Solution:

Teapot B contains 20 cups of tea as its outlet is placed in the middle of teapot A. Rest of the
tea just starts overflowing.

Solution:

Number 66

Solution:

String 2.

Solution:

It encircled in the picture below.

Solution:

No glass will ever fill.

Explanation:
Outlet to Glass-1 & 5 is blocked at the initial point, so they won't fill.
Outlet to Glass-2 is blocked at the endpoint, so it won't fill.
Outlet to Glass-3, 4 & 7 is also blocked in the middle, so they won't fill.
Nothing is connected to Glass-6.

Solution:

The spiral B consists of two parts.

Solution:

C

Explanation:
It Seems, the water level might be even in all the glasses, but what will happened if we remove the objects from the glasses. When you put an object in water, it will displace the water with the mass of the object Hence, the glass that contains the object with the least amount of weight will have the most water in it.

Even though we might not know the exact weight of all those four objects, we can all agree, that the paper clip weighs the least and hence will displace the minimum water.

Solution:

The title of the book is upside down as the bookmarker is always on top.

Solution:

Three hidden words are
1. Bloom
2. Garden
3. Farm

Solution:

2.

Rest all are the reflection of two girls in the mirror.