GK: Which country in the world has never been a slave of anyone? Click here to know

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Question 1: Which country in the world has never been a slave to anyone? 
answer: Nepal 
Question 2: Which is the highest peak in the world?
Answer: Everest 

Question 3: What is the name of the world's largest sea?
Answer: Pacific Ocean
Question 4: What is the unit of work?
Answer: Joule

Question 5: Whose unit is a light year?
Answer: Distance