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Under which of the following conditions are you most likely to
Science
Science

Class 9

NCERT

Publisher:
NCERT
Subject:
Science
1

Chapter 1: Matter in Our Surroundings

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2

Chapter 2: Is Matter Around Us Pure?

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3

Chapter 3: Atoms and Molecules

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4

Chapter 4: Structure of the Atom

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5

Chapter 5: The Fundamental Unit of Life

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Chapter 6: Tissues

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7

Chapter 7: Diversity in Living Organisms

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8

Chapter 8: Motion

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9

Chapter 9: Force and Laws of Motion

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10

Chapter 10: Work and Energy

23 questions

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11

Chapter 11: Sound

25 questions

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12

Chapter 12: Why do We Fall Ill?

6 questions

Q1
Under which of the following conditions is a person most likely to fall sick?Why?
Q2
Under which of the following conditions are you most likely to fall sick?Why?
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13

Chapter 13: Natural Resourses

6 questions

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14

Chapter 14: Improvement in Food Resources

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15

Chapter 15: Gravitation

29 questions

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Question
Easy
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Under which of the following conditions are you most likely to fall sick?Why?

A
When you are taking examinations.

B
When you have travelled by bus and train for two days.

C
When your friend is suffering from measles.

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Updated on: Sep 15, 2022

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Science (NCERT)

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I am most likely to fall ill when the friend is suffering measles. Measles is a viral infection. It is a contagious disease. It spreads through the contact with infected mucus and saliva. The virus can even sustain on inanimate object for several hours. Even coming in contact or sharing items with an infected person results in spread of disease.
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Under which of the following conditions is a person most likely to fall sick?Why?
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Under which of the following conditions is a person most likely to fall sick?Why?
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Q.3. Choose the correct alternatives. (1) If a sound wave travels from East to West, the particles of air move in direction.
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he medium travels through the medium and not the particles of the medium. A wave is a disturbance that moves hrough a medium when the particles of the edium set neighbouring particles into motion. They in turn produce similar motion others. The particles of the medium do not ove forward themselves. but the turbance is carried forward. This is what ppens during propagation of sound in a dium, hence sound can be visualised as a ve. Sound waves are characterised by the tion of particles in the medium and are ed mechanical waves. Air is the most common medium through ch sound travels. When a vibrating object es forward, it pushes and compresses the n front of It creating a region of high sure. This region is called a compression as shown in Fig. 12.5. This compression to move away from the vibrating object. the vibrating object moves backwards. ates a region of low pressure called ction (R), as shown in Fig. 12.5. As the moves back and forth rapidly, a series pressions and rarefactions is created air. These make the sound wave that gates through the medium. ession is the region of high pressure faction is the region of low pressure. is related to the number of particles fum in a given volume. More density articles in the medium gives more - and vice versa. Thus, propagation can be visualised as propagation of ariations or pressure variations in am. brating object creating a series of Dressions (C) and rarefactions (0) in edium. uestion 1. How does the sound a med a vibrating object in a reach your ear? To electric connection Switch Cork Bell Jar Electronic bell 12.2.1 SOUND NEEDS A MEDIUM TO TRAV Sound is a mechanical wave and needs material medium like air, water, steel the 1222 SOUND WAVES ARE LONGITUDINAL Its propagation. It cannot travel throu vacuum, which can be demonstrated by the G WAVES following experiment. Take an electric bell and an airtight bell jar. The electric bell is suspended insid the airtight bell jar. The bell jar is connected to a vacuum pump, as shown in Fig. 125 you press the switch you will be able to br the bell Now start the vacuum pump. Wh the air in the jar is pumped out gradua the sound becomes fainter, although same current is passing through the be After some time when less air is left tosi the bell Jar you will hear a very feeble sound What will happen if the air is remove completely? Will you still be able to heat the sound of the bell? nestions 1. Explain hour sound is produced by your school bell 2. Why are sound waves called mechanical waves? Soon 3. Suppose you and your friend are on the moon. Will you be able to hear any sound produced by your friend? SOUND Activity 12.4 Take a slinky. Ask your friend to hold one end. You hold the other end. Now stretch the sinky as shown in Fle 127 (a). Then give it a sharp push towards your friend What do you notior? If you move your hand pushing and pulling the slinky alternatively, what will you observe? If you mark a dot on the slinky, you will observe that the dot on the slinky will move back and forth parallel to the direction of the propagation of the disturbance. (a) 000000 RCRCRCRC (24 Fig. 12.7: Longitudinal wave in a slinky The regions where the colls become closer are called compressions (C) and the regions where the colls are further apart are called rarefactions (R) As we already know, sound To vacus p propagates in the medium as a series of compressions and rarefactions. Now, we can compare the propagation of disturbance in a Fig. 12.6: Bell jar experiment showing sound a slinky with the sound propagation in the travel in vacuum medium. These waves are called longitudinal waves. 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Question Text
Under which of the following conditions are you most likely to fall sick?Why?
Updated OnSep 15, 2022
TopicWhy do We Fall Ill?
SubjectScience
ClassClass 9
Answer TypeText solution:1 Video solution: 2
Upvotes238
Avg. Video Duration2 min