Question Pool Wave Motion

Wave Motion - SAMAGRA Question Pool & Answers | Class 9 English Medium

Kerala Syllabus SAMAGRA SCERT SAMAGRA Question Pool for Class 9 English Medium Physics Wave Motion

BrainsPrep Logo


Qn 1.

The graph shown below gives the displacement and the distance travelled by a wave in 2 seconds

a. complete the table using the graph shown below

Charecteristics of the wave

measured value

Amplitude

2 cm

wavelegth

.............(i)..............

Frequency

.............(ii)............

 

b. What is the velocity of the wave given above



Download BrainsPrep

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition


BrainsPrep Logo
Qn 2.

Examine the word pair given below.

i. : Frequency

ii. ƛxf : ...............

a. Write down the relationship in the first pair of words.

b. Complete the second pair using the same relationship.



Download BrainsPrep

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition


BrainsPrep Logo
Qn 3.

A tuning fork of 256 Hz excited and pressed against a table surface.

a) what is the frequency of vibration of the table? 

b) what is this phenomenon called?



Download BrainsPrep

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition


BrainsPrep Logo
Qn 4.

Which wave is propagated from the epicenter of an Earthquake ? Which instrument is used to measure the intensity of an Earthquake?



Download BrainsPrep

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition


BrainsPrep Logo
Qn 5.

Sound travels 1020m through a medium in 3 seconds. Which could be the media among the following?Justify your answer.

(Aluminium, Steel, Air, Seawater)



Download BrainsPrep

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition


BrainsPrep Logo
Qn 6.

The maximum displacement of a particle in a medium from its mean position is known as .............



Download BrainsPrep

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition


BrainsPrep Logo
Qn 7.

The waves which needs a medium for propagation are .....................

(light waves, Electromagnetic waves, mechanical waves, Radio waves)



Download BrainsPrep

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition


BrainsPrep Logo
Qn 8.

Bhooming of sound is heard when the sound is produced in an empty hall. What is this phenomenon called?



Download BrainsPrep

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition


BrainsPrep Logo
Qn 9.

The instruments shown below are working by making use of some sound phenomenon.

IMAGE

a) which sound phenomenon is made use of in this instrument? 

b) The ceiling of certain halls are constructed with a curvature. What is it’s advantage?



Download BrainsPrep

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition


BrainsPrep Logo
Qn 10.

Tie one end of a rope to a window. Wind a ribbon on the rope. Hold the other end of the rope and move it up and down.The speed of the wave is constant.

Tie one end of a rope to a window. Wind a ribbon on the rope. Hold the other end of the rope and move it up and down.The speed of the wave is constant.

IMAGE

a) which wave is formed on the rope?

b) The ribbon completes 5 vibrations in a second. Then what is the velocity of the wave through the rope? 

c) If the vibration of the rope is doubled what change will happen to the lenghth between A and B? Explain.



Download BrainsPrep

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition


BrainsPrep Logo
Qn 11.

A particle ‘P’ in a medium is represented in the figure.

IMAGE

 

a) what is the direction of motion of the particle ‘P’ if the sound wave is travelling in the direction AB through the medium.

b) Increase of which characteristics of the travelling sound wave increases it’s frequency? 

c) what is the frequency of the sound wave if the particle completes 6000 vibrations in a minute? 



Download BrainsPrep

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition


BrainsPrep Logo
Qn 12.

Graphic representation of a transverse wave is shown below.

IMAGE

Graph

a) Which particles are of same phase of vibration in the given graph?

( A-E , B-G , B-C , D-H, F-J) (1)

b) Find out the amplitude and wavelength from the graph.

Graphic representation of a transverse wave is shown below.

Graph

a) Which particles are of same phase of vibration in the given graph?

( A-E , B-G , B-C , D-H, F-J) 

b) Find out the amplitude and wavelength from the graph.



Download BrainsPrep

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition


BrainsPrep Logo
Qn 13.

Observe the representation of waves formed on the surface of water .(Speed of waves in the water is taken as 1500m/s)

IMAGE

 

a) Which wave is formed on the surface of water? 

b) If the diameter of the container is 90cm, what is the frequency of the wave?

c) If the same sound passes with a speed of 2500m/s through water after adding some salt, what change will happen to its wavelength?

Observe the representation of waves formed on the surface of water .(Speed of waves in the water is taken as 1500m/s)

a) Which wave is formed on the surface of water? 

b) If the diameter of the container is 90cm, what is the frequency of the wave? 

c) If the same sound passes with a speed of 2500m/s through water after adding some salt, what change will happen to its wavelength?

Observe the representation of waves formed on the surface of water .(Speed of waves in the water is taken as 1500m/s)

a) Which wave is formed on the surface of water? 

b) If the diameter of the container is 90cm, what is the frequency of the wave?

c) If the same sound passes with a speed of 2500m/s through water after adding some salt, what change will happen to its wavelength?



Download BrainsPrep

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition


BrainsPrep Logo
Qn 14.

Answer the questions

a) Write two problems raising by multiple reflection of sound in auditoriums (1)

b) Write two methods to solve this.



Download BrainsPrep

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition


BrainsPrep Logo
Qn 15.

Fill up the blanks suitably

Sound waves in air       :    Longitudinal form

Waves on the surface of water: .................................



Download BrainsPrep

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition


BrainsPrep Logo
Qn 16.

Diagrams of some musical instruments are given

IMAGE

Diagrams

a) What is known as the vibration of sound board of Guitar and air inside a Chenda? 

b) Explain this phenomenon. 



Download BrainsPrep

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition


BrainsPrep Logo
Qn 17.

The waves which are responsible for the earthquake originate from the epic centre of the earthquake .

a. Write down the name of these waves.

b.  Name the instrument which is used to measure the intensity of the earthquake



Download BrainsPrep

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition


BrainsPrep Logo
Qn 18.

Solve the problems given below.

a) Calculate the velocity of a wave with a frequency of 256Hz and wave length 1.5m . 

b) What change will occur to the wavelength of the above wave ,if the frequency is increased to 512Hz without changing the medium ?

c) Where the wavelength will be more when a sound wave from a tuning fork of frequency 256Hz travels through air and steel? Explain 

( speed of sound: In steel – 5941m/s, In Air – 343m/s)



Download BrainsPrep

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition


BrainsPrep Logo
Qn 19.

Graphic representation of a sound wave reaching the ears of a boy sitting at a distance buzzer source is given below.

IMAGE

a. What is the direction of propagation of particles in the medium when sound is travelling through air? 

b. What is the frequency of the wave if it’s speed through air 350m/s?

c. Howlong it will take for the sound to reach the ears of the boy if he is sitting 100m away from the buzzer source? 

d. What changes for the medium can be suggested to make the boy hear the same sound in less time from the same distance. 



Download BrainsPrep

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition


BrainsPrep Logo
Qn 20.

Give scientific explanation for the life situations below by making use of the hints given.

a) Glass window panes will break at times when thunder strikes .why?

(Hints. Natural frequency,Amplitude of vibration, Resonance, Forced vibration)

b) Some special arrangements are made to hear the sound clearly inside large halls.

( Hints: Carpets, Acoustics of buildings, Reflection of sound, Reverberation)



Download BrainsPrep

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition


BrainsPrep Logo
Qn 21.

The sound produced by a tuning fork of 480Hz travels with a speed of 360m/s through air. Then

a. What is the wavelength of the wave through air? 

b. If the length of the air column through which the sound travelled is 3m, How many compressions will be there? 



Download BrainsPrep

Get Free Study Materials + 1 Week Free Trial of BrainsPrep Class 9 English Medium Tuition


BrainsPrep Logo
Class 10 English Medium SAMAGRA Question Pool Click here
Class 10 - Malayalam Medium SAMAGRA Question Pool Click here
Class 9 English Medium SAMAGRA Question Pool Click here
Class 11 SAMAGRA Question Pool Click here
Class 12 SAMAGRA Question Pool Click here