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Who introduced the concept of social identity?

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Important Questions on Books, Personalities and Events

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Who among the following invented Adding Machine?
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Which device is used to test whether an object is carrying charge or not? 
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Who among the following invented Electric Motor? 
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Who invented first working laser?
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Who among the following scientist discovered the Law of Floatation?
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Who invented the process of photography on metal?
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Who discovered the double-helical structure of DNA?
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The innovative concept of using sunshine to keep houses warm in freezing winters is called ______
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Where was paper invented?
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Punched card is also called as _____.
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In April 2019, scientists in _____ produced the world's first 3D printed heart using human tissue
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Who presented that all the plants and animals are composed of cells and that the cell is the basic unit of life?
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Who among the following scientists invented the Cotton Gin?
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Who discovered the nucleus for the first time in cell?
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Christiaan Barnard is famous for _____.
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Who discovered electromagnetism?
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Whose invention led to the development of polio vaccine?
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In 1831, electricity became viable for use in technology when ______ created the electric dynamo.

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Scientists have created world's shortest laser pulse _____ with a duration of just 43 attoseconds.
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The test for diagnosing HIV is:  

1. Pap Smear
2. ELISA
3. DND
4. Mantoux