Sound and Noise
Fill in the blanks:
1. Some sound hurt our ears if we listen to them for long.
2. The hinges of an old door make a creaking sound when the door is opened or closed.
3. An example of warning sound Police Siren.
4. Chattering of monkeys.
5. Chirping of sparrows.
6. Howling of wolves.
Fill in the blanks.
1. Listening to loud noises can be harmful to our ears.
2. Noise pollution does not allow people to sleep properly.
3. Honking of traffic on road causes lots of noises pollution.
4. Noise pollution causes loss of sleep and concentration.
5. Avoid watching television and listening to radio at high volumes.
Section I
A. Choose the correct option.
1. A clock produces
a. creaking sound. [ ]
b. hissing sound. [ ]
c. rustling sound. [ ]
d. tick-tock sound. [✓]
2. Which of the following produces a rustling sound?
a. Table. [ ]
b. Leaves. [✓]
c. Teakettle. [ ]
d. Doors. [ ]
3. Which of these produces a whirring sound?
a. Vacuum cleaner. [ ]
b. Piano. [ ]
c. Dog. [ ]
d. Fan. [✓]
4. A fire alarm produces
a. musical sound. [ ]
b. loud noise. [✓]
c. hissing sound. [ ]
d. chattering sound. [ ]
5. Noise pollution is generally caused by
a. bursting of crackers. [ ]
b. loudspeaker. [ ]
c. aircraft. [ ]
d. All of these. [✓]
B. Give two example of the following:
1. Warning sound.
= Fire Alarm; and Police Siren;
2. Common object's sound.
= Tick-tock by clock; and Whirring of fan.
Section II
C. Short answer questions.
1. How does a clock produce a soft "tick-tock" sound?
= A clock produces a soft "tick-tock" sound when its second's hand moves.
2. When does a door produce a creaking sound?
= The hinges of an old door may make a creaking sound when the door is opened or closed.
3. Give example to suggest that we can recognize an animal or bird by the sounds it makes.
= We can easily recognize an animal or a bird by the type of sound it makes. Some animal and bird sounds that we are familiar with including roaring of a tiger or lion, chattering or monkeys, howling of wolves, screeching of parrots, chirping of sparrows, cooing of pigeons, and barking of dogs.
4. What are warning sounds? Give an example.
= Warning sounds are loud sounds that are used to warn people about a danger or an emergency. These warning sounds are important as they alert people to either get out of, or stay away from, a place or a situation that may put their lives in danger.
5. What is a noise? How is it different from noise pollution?
= A loud and unpleasant sound that can cause physical and mental disturbance is called noise.
Excessive and continuous noise which impacts human and animal health is called noise pollution.
D. Answer the following in details.
1. What are the different kinds of sounds we hear throughout the day?
= From the moment we wake up in the morning till the time we go to sleep, we hear a large number of different sounds throughout the day. Every object around us makes a distinct sound. Some of them make us feel happy and relaxed, whereas others may hurt our ears if we listen to them for too long.
2. Differentiate between pleasant and unpleasant sound giving examples.
=
|
Pleasant Sound |
Unpleasant Sound |
|---|---|
|
i)Any sound that makes us feel happy and relaxed can be called a
pleasant sound. |
i) Any sound that makes us feel uncomfortable, irritated, or causes a
feeling of being unwell can be called an unpleasant sound. |
|
ii)Example:- Music from different musical instruments such as a
sitar, a harmonium, or a guitar. Sounds made by waves on a beach. Sound of
gently falling rain, gentle chirping of birds etc. |
ii) Example:- Honking of vehicles on the road, Loud explosion, Noise
from factories and generators, Loud sound made by aircrafts while taking off
and landing. |
3. What are the harmful effects of sound pollution?
= Noise pollution can cause the following problems -
i) Dizziness, headaches, and earaches.
ii) Tiredness and stress.
iii) Loss of sleep and loss of concentration.
iv) Hypertension and even permanent loss of hearing.
v) Noise pollution can cause hearing loss and irritability in animals too.
4. Describing ways or noise pollution.
= We should take the following preventive measures to save ourselves from noise pollution -
i) Avoid using loudspeakers for too long and too loudly.
ii) Get electrical appliances checked regularly to reduce the noise produced by them.
iii) Traffic should be regulated to avoid noise from vehicles. Unnecessary honking should be controlled in residential areas, and near schools and hospitals.
iv) Use heavy carpets and curtains at home; they help in absorbing noise coming from outside.
v) Plant trees in the neighbourhood. Trees and plants also absorb noise to a great extent.
vi) Avoid watching television and listening to radio at high volumes.
5. What happens when there is no air, in case of sound?
= If there is no air, you will not be able to hear sound as sound needs a medium to travel.
6. What is noise pollution?
= A loud and unpleasant sound that can cause physical and mental disturbance is called noise. Listening to loud noises for a long time can be harmful to our ears.
Loud noise disturbs our comfort levels. Excessive and continuous noise which impacts human and animal health is called noise pollution.