9th Standard Syllabus & Materials
9th Standard
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NEW9th Standard
TN 9роЖроорпН ро╡роХрпБрокрпНрокрпБ роХрогро┐родроорпН роЕро│ро╡ро┐ропро▓рпН,рокрпБро│рпНро│ро┐ропро┐ропро▓рпН&роиро┐роХро┤рпНродроХро╡рпБ роорпБроХрпНроХро┐ропрооро╛рой 2,3,&5 роородро┐рокрпНрокрпЖрогрпН ро╡ро┐ройро╛роХрпНроХро│рпН ро╡ро┐роЯрпИроХро│рпБроЯройрпН TN 9th Maths Mensuration,Statistics&Probability Important 1 Mark Questions with Answers 2,3,&5 Marks Questions with Answers.
NEW9th Standard
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NEW9th Standard
TN 9роЖроорпН ро╡роХрпБрокрпНрокрпБ роЪроорпВроХ роЕро▒ро┐ро╡ро┐ропро▓рпН ро╡ро░ро▓ро╛ро▒рпБ - родрпКроЯроХрпНроХроХро╛ро▓родрпН родрооро┐ро┤рпНроЪрпН роЪроорпВроХроорпБроорпН рокрогрпНрокро╛роЯрпБроорпНроорпБроХрпНроХро┐ропрооро╛рой 2,3,&5 роородро┐рокрпНрокрпЖрогрпН ро╡ро┐ройро╛роХрпНроХро│рпН ро╡ро┐роЯрпИроХро│рпБроЯройрпН TN 9th Social Science HIS - Early Tamil Society and Culture Important 1 Mark Questions with Answers 2,3,&5 Marks Questions with Answers.
NEW9th Standard
TN 9роЖроорпН ро╡роХрпБрокрпНрокрпБ роЪроорпВроХ роЕро▒ро┐ро╡ро┐ропро▓рпН ро╡ро░ро▓ро╛ро▒рпБ - родрпКро┤ро┐ро▒рпНрокрпБро░роЯрпНроЪро┐ роорпБроХрпНроХро┐ропрооро╛рой 2,3,&5 роородро┐рокрпНрокрпЖрогрпН ро╡ро┐ройро╛роХрпНроХро│рпН ро╡ро┐роЯрпИроХро│рпБроЯройрпН TN 9th Social Science HIS - Industrial Revolution Important 1 Mark Questions with Answers 2,3,&5 Marks Questions with Answers.
NEW9th Standard
TN 9роЖроорпН ро╡роХрпБрокрпНрокрпБ роЪроорпВроХ роЕро▒ро┐ро╡ро┐ропро▓рпН ро╡ро░ро▓ро╛ро▒рпБ - роиро╡рпАрой ропрпБроХродрпНродро┐ройрпН родрпКроЯроХрпНроХроорпН роорпБроХрпНроХро┐ропрооро╛рой 2,3,&5 роородро┐рокрпНрокрпЖрогрпН ро╡ро┐ройро╛роХрпНроХро│рпН ро╡ро┐роЯрпИроХро│рпБроЯройрпН TN 9th Social Science HIS - The Beginning of the Modern AgeImportant 1 Mark Questions with Answers 2,3,&5 Marks Questions with Answers.
Published on: 11/09/2019
Sound
Download Tamil Nadu 9th Standard Science question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
Questions + Answers key
Take MCQ Science Test1.
The velocities of sound waves in four media P, O, Q, R and S are 18,00 km/h, 900 km/h, 0 km/h, and 1200 km/h respectively. Which could be a liquid medium?
R
Q
P
S
2.
When the pitch of note by a harmonium is lowered, then the wave length of the note
first decreases and then increases
decreases
remains the same
increases
3.
In the sound wave produced by a vibrating turning fork as shown in the diagram, half the wave length is represented by:
BD
AB
AE
DE
4.
Which of the following statement best describes frequency?
the number of complete vibrations per second.
the distance travelled by a wave per second.
the distance between one crest of wave and the next one.
the maximum disturbance caused by a wave.
5.
Which of the following vibrates when a musical note is produced by the cymbals in a orchestra?
stretched strings
stretched membranes
air columns
metal plates
6.
In the inner ear, the pressure variations are turned into electrical signals by the _______ .
7.
____________ is a medical instrument used for listening to sounds produced in the body.
8.
Number of vibrations produced in one second is ____________
9.
Vibration of object produces_________.
10.
Frequency
11.
Amplitude
12.
Ultrasonics
13.
Tuning fork
14.
What is meant by supersonic speed?
15.
Can sound travel through vacuum?
16.
Name the device which is used to produce sound in laboratory experiments.
17.
List the applications of sound.
18.
A stone is dropped from the top of a tower 750 m high into a pond of water at the base of the tower. Calculate the number of seconds for the splash to be heard?
(Given g = 10 m s–2 and speed of sound = 340 m s–1)
1.
(d)
S
2.
(d)
increases
3.
(b)
AB
4.
(a)
the number of complete vibrations per second.
5.
(d)
metal plates
6.
( )
cochlea
7.
( )
Stethoscope
8.
( )
Frequency
9.
( )
sound
10.
Number of vibrations produced in unit time - Hertz
11.
The maximum displacement from the mean position - Metre
12.
The sound whose frequency is greater than 20,000 Hz
13.
Longitudinal wave
14.
When an object travels at a speed higher than that of sound in air, it produces shock waves. These shock waves carry a large amount of energy. The air pressure variations associated with this type of shock waves produce a very sharp and loud sound called sonic bloom or supersonic speed.
15.
No, sound cannot travel through vacuum.
Because, sound can travel only when there are particles, which can be compressed and rarefied in the medium.
16.
Tuning fork
17.
1. Musical instruments such as shehnai, trumpets and Nathaswaram, Mega phones, loud speakers uses the property of reflection of sound to guide most of the sound waves from the source in the forward direction towards the audience.
2. In stethoscopes, sound produced in the body reaches doctor's ears by multiple reflection of sound that happen in the connecting tube.
3. Echo is used to find the distance between two distance objects.
4. Ultrasound is used in examing inner parts of the body and also in marine surveying.
5. Ultrasound is used in cleaning technology, to detect cracks and flaws to form the image of the heart through 'echo cardiography'.
6. Ultrasound is employed to break stones formed in the kidney.
7. 'SONAR' is a device uses ultrasonic waves to measure the distance, direction and speed of the underwater objects.
8. In Electrocardiogram (ECG) the sound variation produced by the heart is converted into electrical signals, which represents the electrical activity of the heart muscle.
18.
Velocity of sound = 340 ms-1
Height of tower = 750 m
Total distance travelled = 2 x 750: 1500 m
\(Valocity=\frac {distance}{time}\)
\(340=\frac {1500}{time}\)
\(time=\frac {1500}{340}=4.4s\)
After 4.4 s, the splash is heard.
9th Standard Syllabus & Materials
9th Standard
TN 9роЖроорпН ро╡роХрпБрокрпНрокрпБ роЪроорпВроХ роЕро▒ро┐ро╡ро┐ропро▓рпН ро╡ро░ро▓ро╛ро▒рпБ - рокрогрпНроЯрпИроп роиро╛роХро░ро┐роХроЩрпНроХро│рпН роорпБроХрпНроХро┐ропрооро╛рой 2,3,&5 роородро┐рокрпНрокрпЖрогрпН ро╡ро┐ройро╛роХрпНроХро│рпН ро╡ро┐роЯрпИроХро│рпБроЯройрпН TN 9th Social Science HIS - Ancient . Civilisations Important 1 Mark Questions with Answers 2,3,&5 Marks Questions with Answers.
NEW9th Standard
TN 9роЖроорпН ро╡роХрпБрокрпНрокрпБ роЪроорпВроХ роЕро▒ро┐ро╡ро┐ропро▓рпН ро╡ро░ро▓ро╛ро▒рпБ - рокрпБро░роЯрпНроЪро┐роХро│ро┐ройрпН роХро╛ро▓роорпН роорпБроХрпНроХро┐ропрооро╛рой 2,3,&5 роородро┐рокрпНрокрпЖрогрпН ро╡ро┐ройро╛роХрпНроХро│рпН ро╡ро┐роЯрпИроХро│рпБроЯройрпН TN 9th Social Science HIS - The Age of Revolutions Important 1 Mark Questions with Answers 2,3,&5 Marks Questions with Answers.
NEW9th Standard
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NEW9th Standard
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Tamilnadu Stateboard 9th Standard Subjects
Tamilnadu Stateboard Standards
