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Q. Decibel is a term connected with :
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Q. The Solar energy produced by
Q. Which of the following statements is true when we see ''rainbow' ?
Q. What effect does the speed of sound have on increasing temperature?
Q. Red shift is an illustration of
Q. Red light is used in traffic signals because
Q. Which one of the following is the value of one nanometer?
Q. Which of the following is a renewable source of energy
Q. Water cannot be used to extinguish fire caused by electric current, as
Q. Which of the following is NOT a method to reduce friction?
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