81. Sound moves through the air and reaches our ears and gives us . . . . . . . .
82. When a longitudinal wave moves through a certain medium; the quantity which is transmitted through the medium is
83. When the same note is played on a sitar and a flute, the sound produced can be distinguished from each other because of the difference in
84. Which one of the following statements is not correct
85. To hear a distinct echo the time interval between the original sound and the reflected sound must be at least
86. An oscilloscope is an instrument which allows us to see waves produced by
87. The velocity of sound is maximum in
88. What is the purpose of 'evolved Laser Interferometer Space Antenna, (eLISA)' project?
89. The sound produced by a bat is
90. Which of the following is not a characteristic of wave?
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