Production, propagation and types of sound. Science CBSE, Class 9: lessons, tests, tasks.

1.	Sound
2.	Waves
3.	Properties of sound
4.	Reflection of sound
5.	Range of sound
6.	Sound navigation and ranging
7.	Structure of human ear

1.	Numerical based on velocity Difficulty: easy	3
2.	Formula and unit Difficulty: easy	4
3.	Properties of a sound in terms of amplitude and frequency Difficulty: easy	3
4.	Frequency of sound wave Difficulty: easy	2
5.	Vibrating part of musical instruments Difficulty: medium	2
6.	Sound range Difficulty: medium	6
7.	Numerical based on frequency Difficulty: medium	3
8.	Nature and types of sound Difficulty: medium	2
9.	Laws of reflection based exercise Difficulty: medium	2
10.	Numerical based on velocity of sound Difficulty: medium	4
11.	Range of sound waves Difficulty: medium	3
12.	Check whether the sound is audible or inaudible Difficulty: medium	5
13.	Riddles on sound waves Difficulty: medium	4
14.	Frequency of heartbeat rate Difficulty: medium	4
15.	Comparison between light and sound Difficulty: medium	3
16.	Numerical relates wavelength with frequency and speed Difficulty: medium	3
17.	Numerical based on SONAR Difficulty: hard	5
18.	Time of splash Difficulty: hard	4
19.	Numerical based on sound travel Difficulty: hard	4
20.	Time taken by the sound wave Difficulty: hard	5

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Methodical recommendation

Production, propagation and types of sound