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Q. Which one of the following is the secondary source of light in a fluorescent lamp?
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Q. The metal chiefly used for galvanising iron is:
Q. When mechanical waves have a frequency below the audible range, these are called
Q. Which of the following represents the speed of a sound wave?
Q. As you go down into a well, your weight
Q. Fish and other aquatic creatures can live inside a deep frozen pond because
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