NCERT Exemplar IV — task. Science CBSE, Class 9.

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1. Infrasound can be heard by

rhinoceros
dog
human beings
bat

2. Before playing the orchestra in a musical concert, a sitarist tries to adjust the tension and pluck the string suitably. By doing so, he is adjusting

intensity of sound only
frequency of the sitar string with the frequency of other musical instruments
amplitude of sound only
loudness of sound

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38. NCERT Exemplar IV

Exercise condition: