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Q. Calculate the time period (in seconds) of a sound wave of wavelength 4m traveling with a speed of 500m/s
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Q. Materials for rain-proof coats and tents owe their water proof properties to
Q. Which one of the following is the unit of measuring noise ?
Q. Which one of the following types of laser is used in laser printers?
Q. The ''Greenhouse effect' is mainly due to increase in atmospheric
Q. The following is measured in tonne of oil equivalent (toe) ?
Q. For an object, the state of rest is considered to be the state of ________ speed.
Q. If input frequency of a full wave rectifier be n, then output frequency would be
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