Kunal is a student of class 9th. His brother Piyush studies in class 8. One
day they were playing just outside the house. Piyush had a balloon in his
hands. He Inflated the balloon by filling air a into it. He did not tie the
mouth of this air filled balloon with thread. Piyush just held the mouth of
the inflated balloon tightly in the downward direction (towards the
ground) and released it. When the inflated balloon was released with its
mouth in the downward direction then the balloon moved upward on its
own. Kunal was observing this incident very carefully he explained the
principle of balloon moving upward to his younger brother.
Q 14.1Name the principle on which the above device works. [1]
Q14.2 Which of the Newton's law is involved in the working of the above
device? [1]
Q 14.3 Name another device which also works on the same principle as
this device. [1]
Q14.4 What value is displayed by Kunal in this episode? [1]
Answers
Answer:
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Explanation:
(a) The device being used by zip-repairing man to amplify his voice was megaphone. It is also known as loud-hailer.
(b) Megaphone works on the principle of 'multiple reflection of sound'.
(c) Rakesh got disturbed because due to the noise pollution caused by the use of megaphone, he could not concentrate on his studies.
(d) Kunal must have told the 'zip-repairer' man that since many students of the colony are preparing for their final examinations, he should not disturb their studies by using megaphone to make the announcements.
(e) Kunal must have complained to the security incharge of the colony that such unauthorised persons should not be allowed to enter the residential colony to create noise pollution and disturb their piece of mind.
(f) A stethoscope works on the same principle (multiple reflections of sound) as the megaphone. A stethoscope is used by doctors to listen to the sounds produced within the human body, mainly in the heart and lungs.
(g) The various values displayed by Kunal is this episode are (i) Awareness of magaphone and its working (ii) Helping nature (in helping his brother and other students study in peace without any disturbance), and (iii) Social responsibility (in asking for a ban on the entry of hawkers inside the residential colony who disturb their peace).
Explanation:
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