what does this picture(rebus) riddle means ?

Look at the below sequence of letters and tell us what the next letter should be:

O T T F F S S ?

A car is crossing a 20 km-long bridge. The bridge can support at most 1500kg of weight over it. If somehow, the weight on the bridge becomes more than that, it will break.

Now, the weight of the car is exactly 1500kg. At the midway, a bird comes and sits on the roof of the car. This bird weighs exactly 200 grams.
Can you tell if the bridge breaks at this point or not?

Solve the mathematical equation in the picture below.

I am a normal creature, but I have five hands. I can even have more but even then I will be considered normal.

Who am I?

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

Kareena is older than Katrina and younger than Karishma. Isabelle is younger than Bipasha and Karishma. Bipasha is older than Karishma. If Kareena and Isabelle are the same age, who's the youngest?

There was a minor accident with a doctor's son but the doctor noticed no major injury. After the treatment, the father of that doctors son is sitting with the son of the doctor without the doctor being in the room.

How can this be possible?

Can you count the number of squares in the given picture?

What number comes next in this sequence:
7 8 5 5 3 4 4 _