1.
An example of a wind instrument is
flute.
guitar.
violin.
xylophone.
2.
Which of the following compounds of the electromagnetic spectrum has the highest frequency?
Gamma rays
Infra-red radiations
Microwave
Ultraviolet radiations
3.
During thunderstorm, lightning is seen before the sound is heard although both occur at the same time. This is because
sounds needs a material medium for propagation.
light waves are mechanical.
light travels faster than sound.
sound waves are longitudinal whereas light waves are transverse.
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