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Q. What happens when some charge is placed on a soap bubble?
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Q. Who defined the law of gravitation ?
Q. Filaments of electric bulbs are usually made of ?
Q. The element used for making solar cells is
Q. Which of the following is the unit of perceived loudness of sound ?
Q. Atomic number of an atom gives the number of which of the following -
Q. SONAR is based on the principle of
Q. ntensity of sound at a point is ____ its distance from the source.
Q. Speed of sound is maximum in which among the following?
Q. A body falling through a liquid acquires a steady velocity is known as
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