CDS Model Paper 5 General Knowledge

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Question : 41 of 120
 
Marks: +1, -0
Consider the following statements. Work is not done, when:
1. a man is walking on a horizontal road.
2. a man is climbing up a hill.
3. a man with a load on his head is walking on a horizontal road.
4. moon is revolving round the earth.
Which of the statements given above are correct?
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