Can you count the number of lines in the below picture?

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.

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

If you go to the movies and you're paying, is it cheaper to take one friend to the movies twice, or two friends to the movies at the same time?

Can you make numbers like 24, using numbers 3,3,7 & 7 with any arithmetic operator?

What time is it when an elephant sits on a fence?

How many Watermelons are there in the below picture?

A Scientist was fifty years old in the year 2000 but he was forty years old in the year 2010. How can this be possible?

PS: It has a logical answer.

I am a word that begins with the letter “i.” If you add the letter “a” to me, I become a new word with a different meaning, but that sounds exactly the same. What word am I?

I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?