Sound

The to and fro or back and forth motion of an object is called

• Vibration

• Rectilinear

• Frequency

• Decibals

In human beings, the vibration of the ____________ produces sound.

• Eardrum

• Pinna

• Vocal Cords

• Auditory Nerve

The number of oscillations per second is called

• Amplitude

• Frequency

• Pitch

• Time Period

Frequency is expressed in the unit

• km/s

• Decibels

• m/s

• Hertz

Flute is a type of

• String Instrument

• Wind Instrument

• Percussion Instrument

Sound travels fastest through

• Solids

• Liquids

• Gases

A simple pendulum makes 10 oscillations in 20 s. What is the time period and frequency of its oscillations?

• Time Period: 2 sec

  Frequency: 0.5 Hz

• Time Period: 1.5 sec

  Frequency: 2 Hz

• Time Period: 2 sec

  Frequency: 3 Hz

• Time Period: 0.5 sec

  Frequency: 1Hz

Higher the frequency of vibration, the higher is the

• Loudness

• Pitch

• Amplitude

• Noise

Plantation on the roadside and elsewhere can reduce noise pollution.

• True

• False

Sound can travel through vacuum.

• True

• False