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Q. After long periods of use, a grey spot develops on the inside of a bulb. This is because
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Q. Red light has a wavelength of 70 A°. In "nm" it is
Q. In our houses we get 220V ac. The value 220 represents
Q. Electric current in a metal wire is due to the flow of-
Q. In ________ motion of a body its velocity varies with time.
Q. A balloon filled with hydrogen will
Q. Which of these is true of all simple machines?
Q. The quality of sound produced by an instrument depends on the
Q. Who defined the law of gravitation ?
Q. Which scientist first melted two pieces of ice by rubbing them together?
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