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Define focal length?

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Give two problems created by space exploration ?

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What is remote sensing?

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Where output devices are used?

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What do you know about contact lenses?

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How concave lens is a diverging lens?

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Why Robotic spacecraft are sent into space?

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What is dynamo?

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Which is the most important part of space station?

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What is optical axis?

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What are the new technologies developed on earth as a result of space exploration?

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What is bicycle dynamo?

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What is international space station?

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Write the working of electronic system

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How myopia can be corrected ?

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What is advantage of invention of a telescope?

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State the principle of power generator?

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Which problems are involved in generating electricity by wind energy?

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What do you know about camera?

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