🎵 Chapter 13: Sound – Exercise Short Questions
Prepared by Muhammad Tayyab, Subject Specialist Physics, Govt Christian High School Daska. Based on PECTAA 2026 syllabus (National Curriculum 2023).
📖 What's Inside: This section covers exercise short questions from Chapter 13 Sound including medium effect on sound, reflection of sound, factors affecting loudness, echo, and ultrasound in medicine. Each question is presented with the exact exam-ready answer as per the official PECTAA 2026 Physics curriculum. Perfect for Punjab Boards (Lahore, Gujranwala, Multan, etc.) and all BISE boards across Pakistan.
📚 Related Resources – Chapter 13: Sound
Sound covers waves, echo, ultrasound, SONAR, pitch, loudness, and acoustics. Includes solved examples and numerical problems.
📖 Exercise Short Questions & Answers (PECTAA 2026)
13.1 How does the medium affect the speed of sound?
The speed of sound varies with the type of medium. It moves 5 times faster in liquids and 15 times faster in solids than in gases.
The speed of sound varies with the type of medium. It moves 5 times faster in liquids and 15 times faster in solids than in gases.
13.2 Does sound waves show reflection?
Yes, sound waves show reflection. When sound waves hit a surface and bounce back into the same medium, the phenomenon is called an echo or reflection of sound.
Yes, sound waves show reflection. When sound waves hit a surface and bounce back into the same medium, the phenomenon is called an echo or reflection of sound.
13.3 What factors influence the loudness of sound?
Loudness of sound depends upon number of factors. Some of them are given below:
(i) Amplitude of vibrating body
(ii) Area of vibrating body
(iii) Distance from vibrating source
Loudness of sound depends upon number of factors. Some of them are given below:
(i) Amplitude of vibrating body
(ii) Area of vibrating body
(iii) Distance from vibrating source
13.4 Why do we hear an echo when we clap near a building?
When we clap or shout near a tall building or mountain, we hear the sound return after a brief delay. This repeated sound is called an echo, caused by the reflection of sound waves from a surface.
When we clap or shout near a tall building or mountain, we hear the sound return after a brief delay. This repeated sound is called an echo, caused by the reflection of sound waves from a surface.
13.5 What is ultrasound, how is it used in medicine?
Sounds with frequencies above \(20,000\ Hz\), which are inaudible to humans, are called ultrasound or ultrasonics.
Use in medicine: It is widely used in medical diagnostics and treatments. When ultrasonic waves pass through the body, they reflect differently from various tissues and organs. These reflected waves are then captured and converted into images on a screen, a process known as ultrasonography. This helps in visualizing organs such as the heart, liver, and kidneys, as well as in monitoring pregnancies.
Sounds with frequencies above \(20,000\ Hz\), which are inaudible to humans, are called ultrasound or ultrasonics.
Use in medicine: It is widely used in medical diagnostics and treatments. When ultrasonic waves pass through the body, they reflect differently from various tissues and organs. These reflected waves are then captured and converted into images on a screen, a process known as ultrasonography. This helps in visualizing organs such as the heart, liver, and kidneys, as well as in monitoring pregnancies.
📐 Key Formulas – Sound
Wave Equation: \( v = f\lambda \)
Time Period: \( T = \frac{1}{f} \)
SONAR / Echo Distance: \( d = \frac{v \times t}{2} \)
Unit 10Thermal Physics
Unit 11Transfer of Thermal Energy
Unit 12Waves
Unit 13✨ Sound
Unit 14Light
Unit 15Electrostatics
Unit 16Electricity
Unit 17Electromagnetism
Unit 18Electromagnetic Induction & EM Waves
Unit 19Electronics
Unit 20Atomic and Nuclear Physics
Unit 21Space and Environment
📖 Complete syllabus coverage for Class 10 Physics (PECTAA 2026) – Units 10 to 21
💡 Exam Tip:
For board exams, define key terms precisely, mention formulas with units, and relate to real-life examples. These exercise short questions follow the PECTAA 2026 pattern and are prepared by Subject Specialist Muhammad Tayyab.
Created by Hira Science Academy | Aligned with PECTAA 2026 Syllabus