Grade 7 Check-point 6 Science

When the temperature is high in a solid object what happens to the vibration of the sound waves

• vibrates fast

• vibrates slow

• no vibration

• temperature does not affect the movement of the sound waves

If you want to change the pitch of a sound, you have to change the ___

• frequency

• speed

• amplitude

• volume

What happens when you increase the amplitude of a sound?

• it makes the sound louder

• it makes the sound louder

• it increases the wavelength of the sound

• it increases the frequency of the sound

As a sound source approaches and then moves past a stationary observer, the observer will hear

• a steady rise in pitch

• a sudden drop in pitch

• a drop in pitch, then a rise in pitch

• a rise in pitch, then a drop in pitch

Bats use ________ TO LOCATE MOSQUITOES IN THE AIR.

• Ecology

• Radar

• Sonar

• Echolocation

The range of frequencies audible to the human ear

• lower than 20 Hz

• 20 Hz - 20.000 Hz

• higher than 20.000 Hz

• 0 Hz - infinite Hz

Ultrasound is?

• Sound with a frequency higher than 20.000 Hz

• Sound with a frequency lower than 20 Hz

• Sound with a frequency 20 Hz

• sound with a frequency 20.000 Hz

A wave with a large wavelength will have a ______ frequency and _____ energy

• high, low

• high, high

• low, high

• low, low

Middle ear consists of ___ bone/s and its functions is to ____ sound vibrations.

• 2, transfer

• 3, transfer

• 2, transfer

• 3, amplify

Which among the following are percussion instruments?

• veena, guitar, flute

• veena, tabla, flute

• tabla, flute, drum

• tabla, drum, mrudangam