In a group discussion on shape and size of the Earth, three students stated the following points:
1.Student 1: The shape of the Earth is basically an oblate spheroid.
2.Student 2: The polar diameter of the Earth is more than the equatorial diameter.
3.Student 3: Bulge along the equatorial region is due to revolution of the Earth.
Who among the above students is/are correct?
Student 1 only
Student 1 and Student 2 only
Student 2 and Student 3 only
Student 1, Student 2 and Student 3
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Which among the following events happened earliest ?
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An 80-litre solution of alcohol and water has 75% alcohol. How much water (in litres) must be added to bring down the concentration of alcohol to 60%?
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