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ICSE Class 8 Notes 2024 : Environmental Science

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Grade 7 Physics Class Test I. Fill in the blanks. 1. The speed of sound in air in normal conditions is _____________________. 2. Speed of sound in air depends on the __________________________ and ____________________________ in air. 3. Speed of sound is least in ________________________ media. 4. Speed of sound in gas depends on its ____________________ . 5. Speed of sound in water is ____________________. 6. An object travelling with a speed greater than the speed of sound is said to be having _________________________speed. 7. Metallic sheets, plane polished smooth walls are ____________________reflectors of sound. 8. Sound cannot travel through ____________________ media. 9. To hear a clear echo _____________________ should be the distance between the source of sound and the reflecting surface. 10. SONAR stands for ____________________________________________. 11. Megaphones work on the principles of ___________________________ of sound. 12. The three characteristics of sound are _________________________, ____________________________ and _____________________________. 13. Loudness mainly depends on ______________________ of vibration.The maximum displacement of a vibrating particle from its mean position on either side is _________________________. 14. The time taken by a particle to complete one vibration is the ________________________. 15. The no. of vibrations completed by a medium particle in unit time is known as its _________________________. 16. The S.I unit of frequency is ______________________. 17. Pitch determines the ______________________ of a sound. 18. Sounds of same pitch and loudness but produced by two different sources can be distinguished by the ____________________ of sound. 19. A normal human ear can hear clear sounds with frequencies ranging from ___________________________ to __________________ only. 20. Sounds having frequencies lower than 20 Hz are known as _______________________. 21. SONAR uses ______________________ sound waves for finding objects under water.

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