Grade4_Sem2_Science_Sound

The main characteristics of sound, except…

• Speed

• Loudness

• Pitch

• Wavelength

Characteristics of sound divided into … part

• 1

• 2

• 3

• 4

Sound will be a reaction if there is…

• Vibration

• Pitch

• Echo

• Scream

The frequency that a human ear catches ….

• 20-200Hz

• 20-2000Hz

• 20-20,000Hz

• 200-20.000Hz

The frequency of sound that is inaudible to humans is....

• audiosonic

• ultrasonic and sonic audio

• infrasound and audiosonic

• infrasound and ultrasonic

Humans cannot hear sounds with frequencies higher than 20.000Hz. Sounds with frequencies higher than 20.000Hz are called ... sounds.

• audible

• ultrasonic

• infrasonic

• audiosonic

Humans cannot hear sounds with frequencies less than 20Hz. Sounds with frequencies less than 20Hz are called ... sounds.

• audible

• ultrasonic

• infrasonic

• audiosonic

Sound is produced by objects that...

• sound

• vibrate

• play

• smooth

The human ear is divided into three parts. What are they?

• outer ear and middle ear

• outer ear, middle ear, and outer ear

• only inner ear

• outer ear, middle ear, and inner ear

Which one takes care of our ears?

• Hear a loud voice

• Do not use earplugs

• keep the ears dry

• use sharp objects to clean ears