National Science Olympiad Forum By SOF Olympiad Trainer - Page 387

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D

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What doubts, Kavin??

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C

Subject :NSO    Class : Class 6

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Letâ€™s calculate -10 to the 5th power seconds = 105 = 100,000 secondsNow, 60 seconds = 1 minuteOr, 60 x 60 seconds = 3600 seconds = 1 hourOr, 1 second = 1/3600 hourOr, 100,000 seconds = (1/3600) x 100,000 hours = 1000/36 hours = 27.78 hoursNow, letâ€™s see this amount of time is closer to which of the following options:A. Of a full length movie ----- The standard time of a full length movie is 2 hours. So, this option is Incorrect.B. For the Earth to rotate once ----- Earth rotates once in about 24 hours with respect to the Sun. 24 hours is the nearest to 27.78 hours. So, this option is Correct.C. Of an average human lifetime ----- Average human life-time is about 79 years. So, this option is Incorrect.D. Since humans first appeared on the Earth ----- The earliest fossils of anatomically modern humans are from the Middle Paleolithic Age, about 200,000 years ago. So, this option is Incorrect.That means the right answer is Option B.

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Class : Class 7
let's calculate 10 to the power 5. its 10000 seconds . which

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Subject :NSO    Class : Class 6

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d

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A

Subject :NSO    Class : Class 7