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Science scientific reasons[2 marks ]

Sound · Bihar Board (BSEB) STD 8 (BSEB - English Medium). 6 questions.

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scientific reasons[2 marks ]

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6 questions · timed · auto-graded

Question 12 Marks
Two persons cannot communicate with each other on the moon.
Answer
$-$There is no atmosphere on the moon. Sound cannot travel in the vacuum.
$-$Therefore, communication of two persons is not possible on the moon.
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Question 22 Marks
When the tablespoon is gently struck to the metallic tumbler, it produces feeble sound and when it is struck with a greater force, it produces louder sound.
Answer
$-$Loudness of the sound depends on the its amplitude.
$-$When the tablespoon is gently struck to the metallic tumbler it produces feeble sound since amplitude of vibrations are very small.
$-$When spoon is struck with greater force, the amplitude of vibrations are very large so it produces louder sound.
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Question 32 Marks
The sound produced by a mosquito is quite different from roar of a lion.
Answer
$-$Sound produced by mosquito has high frequencies and therefore, produces a sound of higher pitch.
$-$The lion makes a low$-$pitched roar because its sound frequencies are low. $($The roar of a lion is very loud while sound of mosquito is quite feeble.$)$
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Question 42 Marks
The sound cannot travel through vacuum.
Answer
$-$Sound needs a medium to travel.
$-$The medium may be solids, liquids or gaseous.
$-$The material particles are not present in the vacuum, therefore sound cannot travel through it.
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Question 52 Marks
Trees must be planted along the road.
Answer
$-$Movements of the vehicles on the road produce the noise pollution.
$-$Trees must be planted along road to cut down the sound reaching the residence.
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Question 62 Marks
We must never put a sharp, pointed or hard thing into our ear.
Answer
$-$If we put a sharp, pointed or hard things into our ear, it may damage the eardrum of our ear.
$-$The damaged eardrum can impair hearing.
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scientific reasons[2 marks ] - Science STD 8 Questions - Vidyadip