Sound_LS_3

What is the frequency of the sound produced when the vocal cords are:

(a) tight and thin?

• High and shrill

• Low and deep

• High and deep

• Low and shrill

What is the frequency of the sound produced when the vocal cords are:

(b) loose and thick?

• High and shrill

• Low and deep

• High and deep

• Low and shrill

Why is it more convenient to put your ear to the track if you want to hear a train approaching from far away?

• To taste the vibrations of the train
• To see the train better
• To hear the vibrations of the train through the rails.
• To smell the train approaching

Question: What everyday observation demonstrates that sound travels much more slowly than light?

• We can hear a car horn before we see the car
• We can see fireworks before we hear the explosion
• We can hear a doorbell before we see someone at the door
• We can see lightning before we hear the accompanying thunder.

Why is the flash of lightning seen first, but the sound of thunder is heard a little later, even though lightning and thunder occur in the sky at the same time and the same distance from us?

• A) Because light travels faster in air than sound.

• B) Because thunder is delayed due to atmospheric conditions.

• C) Because lightning creates a visual illusion that precedes the sound.

• D) Because thunder is generated at a different altitude than lightning.

Name the object (or part) which vibrates to produce sound in the following musical instruments :
(a) Sitar

• drum
• keyboard
• microphone
• strings

Name the object (or part) which vibrates to produce sound in the following musical instruments :
(b) Dholak

• Guitar strings
• Trumpet mouthpiece
• Piano keys
• Drumhead

Name the object (or part) which vibrates to produce sound in the following musical instruments :
(c) Flute

• String
• Drum
• Keyboard
• Air column

Name the object (or part) which vibrates to produce sound in the following musical instruments :
(d)Cymbals

• Drum skin
• The metal plates

• Keys
• Strings

Name one musical instrument each in which the sound is produced:
(a) by vibrating a stretched string.

• Piano
• Guitar
• Drums
• Flute