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  3. 9th Class
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9th Class Science Sound Question Bank Sound HOTS Objective Problems

  • question_answer
    The given figure shows a wave.
    The total number of crests and troughs in the wave is

    A)  3                                            

    B)  5   

    C)  7       

    D)  9

    Correct Answer: C

    Solution :

      This question is successfully answered by the student who can identify the characteristics of a wave, such as its crests and troughs. Peaks and valleys of a wave are called crests and troughs respectively. There are four peaks (N, R, V, and Z) and three valleys (P, T, and X) in the wave shown in the given figure. Hence, the total number of crests and troughs in the wave is 4 + 3 = 7. The correct answer is C.                               


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