SOUND (Echo and vibration)

Q1. Asseertion: Soun wave can travel in vacuum, but light light waves cannot. Reason: Light Is mechanical wave , but sound is an electromagnetic wave.

• A is true, R is false
• A is false , R is true
• Both are true
• Both are false

2. Sound sensation can persist in our ears for about ...

• 1/13th second
• 1/10 sec
• 1 sec
• None

3. Minimum distance required for echo to be hear is:

• 17 m
• 18 m
• 17 km
• 1 m

4. To detect obstacle in their path, bats produce..

• Ultrasonic wave
• Infra sonic wav
• Sonic wave
• None

5. Sound ranging is used by...

• Bats
• Dophine
• Fisherman
• All of the above