2. Questions Bank
  3. 8th Class
  4. Science
  5. Sound

8th Class Science Sound Question Bank Self Test-2

  • question_answer
    Thomas was a mariner, and working in defense force of his country. He was posted on the border of his country and has to look after the activity of the enemy in the sea. His work was made easier by the induction of SONAR in his ship. What should be the frequency of the transmitter of SONAR needed to do the job?

    A)  10,000 Hz

    B)  20,000 Hz

    C)  40,000 Hz

    D)  50,000 Hz

    E)  None of these

    Correct Answer: D

    Solution :


You need to login to perform this action.
You will be redirected in 3 sec spinner