2. Questions Bank
  3. 9th Class
  4. Science
  5. Sound

9th Class Science Sound Question Bank Sound Conceptive Subjective Problems

  • question_answer
    An instrument which is NOT based on the principle of echo is ___. (a) sonar                              (b) thermometer (c) radar                               (d) barometer

    Answer:

    (b),(c),(d)


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