Two in a corner, one in a room, zero in a house, but one in a shelter. What is it?

Today, I celebrated my 32nd birthday but I was born in 1972.
How is this possible?

What does below science rebus mean?

Ag Ag Ag
Ag SPOON Ag
Ag Ag Ag

Identify the hidden meaning behind this picture?

Only one color, but not one size,
Stuck at the bottom, yet easily flies.
Present in sun, but not in rain,
Doing no harm, and feeling no pain.
What is it?

A detective visits his friend John just to discover that John's neighbour Dr Jacob was murdered. Dr Jacob, who is a mathematician wrote the murderer's name in a code word "Hcqtfz". There were five suspects
1. Ajit
2. Pankaj
3. Ganpat
4. Deenu
5. Hariya

The Detective was instantly able to find the murderer.
Can you?

As you can see that fifteen matches have been used to form an arrangement. What you have to do is remove any six of them to make them ten.

You have a three-gallon and a five-gallon measuring device. You wish to measure out four gallons.

Count the number of triangles in the given picture.

Solve the below puzzle by replacing the question mark with the correct number.

3 6 12

4 8 16

5 10 ?