EASY
9th CBSE
IMPORTANT
Earn 100

Differentiate between crest and trough.

Important Questions on Sound

MEDIUM
9th CBSE
IMPORTANT
Modern's abc+ Of Science - Physics For Class IX>Chapter 6 - Sound>CHAPTER PRACTICE TEST 2>Q 3
Echoes can't be heard in a small room. Explain.
MEDIUM
9th CBSE
IMPORTANT
Modern's abc+ Of Science - Physics For Class IX>Chapter 6 - Sound>CHAPTER PRACTICE TEST 2>Q 4
Mention the types of mechanical waves. Identify the type which can be produced in solids, liquids and gases.
MEDIUM
9th CBSE
IMPORTANT
Modern's abc+ Of Science - Physics For Class IX>Chapter 6 - Sound>CHAPTER PRACTICE TEST 2>Q 5
Draw graph for a wave representing wave disturbances and time for a sound changing from low pitch to high pitch, keeping amplitude of the sounds same. 
EASY
9th CBSE
IMPORTANT
Modern's abc+ Of Science - Physics For Class IX>Chapter 6 - Sound>CHAPTER PRACTICE TEST 2>Q 6
When does the eardrum of human ear vibrate?
MEDIUM
9th CBSE
IMPORTANT
Modern's abc+ Of Science - Physics For Class IX>Chapter 6 - Sound>CHAPTER PRACTICE TEST 2>Q 7
The sound of an explosion on the surface of a lake is heard by a boatman 100 m away and a diver 100 m below the point of explosion. Of the two persons mentioned (boatman or diver) who would hear the sound first? And why?
MEDIUM
9th CBSE
IMPORTANT
Modern's abc+ Of Science - Physics For Class IX>Chapter 6 - Sound>CHAPTER PRACTICE TEST 2>Q 8
List three points which an engineer should use while designing an auditorium.
MEDIUM
9th CBSE
IMPORTANT
Modern's abc+ Of Science - Physics For Class IX>Chapter 6 - Sound>CHAPTER PRACTICE TEST 2>Q 9
A man fires a rifle in front of a cliff and hears the echo after 3 seconds. Calculate the distance of the man from the cliff if velocity of sound in air is 340 m s-1.
EASY
9th CBSE
IMPORTANT
Modern's abc+ Of Science - Physics For Class IX>Chapter 6 - Sound>CHAPTER PRACTICE TEST 2>Q 10
Waves of special frequencies are used for cleaning hard to reach places. Name the waves.