Chapters
Chapter 2: Work and Energy
Chapter 3: Current Electricity
Chapter 4: Measurement of Matter
Chapter 5: Acids, Bases and Salts
Chapter 6: Classification of Plants
Chapter 7: Energy Flow in an Ecosystem
Chapter 8: Useful and Harmful Microbes
Chapter 9: Environmental Management
Chapter 10: Information Communication Technology (ICT)
Chapter 11: Reflection of Light
Chapter 12: Study of Sound
Chapter 13: Carbon : An important element
Chapter 14: Substances in Common Use
Chapter 15: Life Processes in Living Organisms
Chapter 16: Heredity and Variation
Chapter 17: Introduction to Biotechnology
Chapter 18: Observing Space : Telescopes
Chapter 12: Study of Sound
Balbharati solutions for Science and Technology 9th Standard Maharashtra State Board Chapter 12 Study of Sound Exercise [Page 137]
Fill in the blank and explain
Sound does not travel through …………
Fill in the blank and explain
The velocity of sound in steel is …............ than the velocity of sand in water.
Fill in the blank and explain
The incidence of ……… in daily life shows that the velocity of sound is less than the velocity of light.
Fill in the blank and explain
To discover a sunken ship or objects deep inside the sea, ....................... technology is used.
Explain giving scientific reason.
The roof of a movie theatre and a conference hall is curved.
Explain giving scientific reason.
The intensity of reverberation is higher in a closed and empty house.
Explain giving scientific reason.
We cannot hear the echo produced in a classroom.
Answer the following question in your own words.
What is an echo? What factors are important to get a distinct echo?
Answer the following question in your own words.
Study the construction of the Golghumat at Vijapur and discuss the reasons for the multiple echoes produced there.
Answer the following question in your own words.
What should be the dimensions and the shape of classrooms so that no echo can be produced there?
Where and why are sound absorbing materials used?
Solve the following example.
The speed of sound in air at 0°C is 332 m/s. If it increases at the rate of 0.6 m/s per degree, what will be the temperature when the velocity has increased to 344 m/s?
Solve the following example.
Nita heard the sound of lightning after 4 seconds of seeing it. What was the distance of the lightning from her? (The velocity of sound in air is 340 m/s?) (Ans: 1360 m)
Solve the following example.
Sunil is standing between two walls. The wall closest to him is at a distance of 360 m. If he shouts, he hears the first echo after 4 s and another after another 2 seconds.
1.What is the velocity of sound in air?
2. What is the distance between the two walls?
(Ans: 330 m/s; 1650 m)
Solve the following example.
Hydrogen gas is filled in two identical bottles, A and B, at the same temperature. The mass of hydrogen in the two bottles is 12 gm and 48 gm respectively. In which bottle will sound travel faster? How may times be as fast as the other?
(Ans: In A; Twice)
Solve the following example.
Helium gas is filled in two identical bottles A and B. The mass of the gas in the two bottles is 10 gm and 40 gm respectively. If the speed of sound is the same in both bottles, what conclusions will you draw? (Ans: Temperature of B is 4 times the temperature of A.)
Chapter 12: Study of Sound
Balbharati solutions for Science and Technology 9th Standard Maharashtra State Board chapter 12 - Study of Sound
Balbharati solutions for Science and Technology 9th Standard Maharashtra State Board chapter 12 (Study of Sound) include all questions with solution and detail explanation. This will clear students doubts about any question and improve application skills while preparing for board exams. The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any. Shaalaa.com has the Maharashtra State Board Science and Technology 9th Standard Maharashtra State Board solutions in a manner that help students grasp basic concepts better and faster.
Further, we at Shaalaa.com provide such solutions so that students can prepare for written exams. Balbharati textbook solutions can be a core help for self-study and acts as a perfect self-help guidance for students.
Concepts covered in Science and Technology 9th Standard Maharashtra State Board chapter 12 Study of Sound are Sound, Propagation of Sound, Characteristics of a Sound Wave, Speed of Sound (Velocity of Sound), Speed of Sound in Different Media, Properties of Sounds, Audibility and Range, Ultrasonic Sound Or Ultrasound, Reflection of Sound, Echoes, Reverberation, SONAR, Sonography, Human Ear.
Using Balbharati 9th Standard solutions Study of Sound exercise by students are an easy way to prepare for the exams, as they involve solutions arranged chapter-wise also page wise. The questions involved in Balbharati Solutions are important questions that can be asked in the final exam. Maximum students of Maharashtra State Board 9th Standard prefer Balbharati Textbook Solutions to score more in exam.
Get the free view of chapter 12 Study of Sound 9th Standard extra questions for Science and Technology 9th Standard Maharashtra State Board and can use Shaalaa.com to keep it handy for your exam preparation
