How many neutrons are present in a single deuterium nucleus?
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What is Convex lens ?
Why is the earth not used as a return wire in a telephone system, while it is dine so in case of telegraph system.
Explain the advantage of fixed pulley?
What is the avarege speed of people fencing like at the olympic games. (sorry for the misspelled words)
X-Ray is avoided by using ?
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Explain the Homogenous ?
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Which particles/ rays do radioactive substances emit?
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