What does this simple rebus mean?

I am a type of vehicle that has two wheels and is powered by humans. What am I?
Hint 1: You can ride me for exercise.
Hint 2: I am environment-friendly.

Imagine you are in a room with no windows or doors. How will you get out?

In the attached figure, you can see a chessboard and two rooks placed on the chess board. What you have to find is the number of squares that do not contain the rooks. How many are there?

You have two jars of chocolates labelled as P and Q. If you move one chocolate from P to Q, the number of chocolates on B will become twice the number of chocolates in A. If you move one chocolate from Q to P, the number of chocolates in both the jars will become equal.

Can you find out how many chocolates are there in P and Q respectively?

What Time Should the last watch show in the below figure?

Complete the following series. It.s very logical:

1, 4, 5, 6, 7, 9, 11, __?

What does the following BrainBat signifies?

ABCDEFGHIJKLMNOPQRSTUVWYZ

QQQQQQQQQQQQQQQQQQQQQQQQQ.

In particular commonwealth games, a female participant won silver and gold medals for a single event.

How can this be possible?

You bought me for dinner but never eat me. What am I?