Daily GK Quiz Game 86
Test #
86
[
27-Mar-2024
]
1.
Which of the following statements is incorrect about ultra-sonics ?
a.
These are sounds whose frequencies are higher than 20,000 cycles per second.
b.
These are inaudible to the human ear.
c.
Bats produce ultra-sonic sounds.
d.
Ultra-sonic sounds are produced when ultra-violet light is incident on sea-water.
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