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  1. A person wants a real image of his own, 3 times enlarged. Where should he stand
  2. A body cools in 7 minute from 60⁰C to 40⁰C. What time, in minute does it take to cool
  3. A plumb line is suspended form a ceiling of a car moving with horizontal acceleration
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  5. The frequency of light ray having the wavelength 3000Å is