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For which research invention was Dr. Hargovind Khurana awarded the Nobel Prize?

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Important Questions on Previous Paper (Solved)

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A man begins his business with an investment of Rs.5000/-. He losses 10% in the first year, but earns with 10 to 20% profit in second and third year respectively. At the end of the third year, how much real profit he gained?
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Which of the following is an indirect tax?
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If the following words are arranged alphabetically, which word will come on the third place?
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A certain amount becomes Rs.5832/- in two years at the rate of 8% compound interest. What is that amount?
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Which European nation discovered India's sea route for the first time?
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What is the name of Iranian currency?
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Who is the author of "Charitraheen"?