When a glass cylinder is filled with water and a piece of thick paper is placed at the mouth and the cylinder is inverted, the paper dies not fall. Why ?

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What is the purpose served by ventilation in building ?

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while calculating KVA using Volt and Ampere Reading, why we multiply the result with Square Root of 3 (i.e, 1.73)?

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What are the characteristics of black body? : quantum physics

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I just want to convert the voltage into current i.e. suppose I have 750V & 1A AC power then I want to convert it into 12V & 62A DC power only difficulty is that I don't want to use the tranceformer. Simply to say, I want to make the step-down without using tranceformer. Please, give me some ideas. And also I want the relation between Magnetic Induction & Weight of the body can be levitated. Or I can say, how much of magnetic induction requires to lift 500gms weight? I am heartily thankful to you.

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Explain the Transparent ?

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Who did first record the sound?

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What is a synthesizer?

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Explain real image?

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Explain about Barometer?

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Explain what is photometry?

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Examine the working of the Refrigerator?

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