What's the best place to go shopping in the ocean?

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?

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.

Make a sentence consisting of three words that have the whole alphabet.

What is wrong in the below Picture?

You are given a cube that is made with the help of 10x10x10 smaller cubes summing up to a total of 1000 smaller cubes. You are asked to take off one layer of the cubes.
How many remain now?

What are the 50th, 63rd and 100th numbers in the sequence below?
4, 5, 8, 8, 9, 9, 12, 13, 13, 13, 17, 18, ...

There are nine dots in the picture that has been attached with this question. Can you join all the dots by drawing four straight lines without picking up your pen?

Forwards I am heavy, backward I am not. What am I?

What number does the below three word/phrase identify and why?
1. Deck
2. Year
3. Singing in the Rain