DUX CBSE Class 8 Sound L1

The loudness of a sound depends on:

• Amplitude

• Frequency

• Time period

• Speed

The loudness of sound is measured in units of

• Decibel (dB)

• Hertz (Hz)

• Metre (m)

• Metre/Second (m/s)

Pitch of sound is determined by its

• frequency

• amplitude

• speed

• loudness

Sound is a kind of

• work

• energy

• force

• pressure

Human can hear sound in the range of

• 200-2000 Hz

• 20-20,000 Hz

• 2-20000 Hz

• 2000-200000 Hz

The number of oscillations per second is called

• Amplitude of oscillation

• Pitch of oscillation

• Frequency of oscillation

• None of the above

Sound cannot travel through

• vacuum

• air

• water

• solid

The velocity of sound at 20°C is approximately

• 3400 m/sec

• 340 m/sec

• 430 m/sec

• 304 m/sec

The number of vibrations made by a vibrating body in one second is

• frequency

• noise

• loudness

• pitch

The voice box is also called as

• stomach

• heart

• larynx

• mouth