• Sound cannot travel in _____.

Answer: vacuum

• Loudness of sound is measured in _____.

Answer: bels

• Sound requires a ____ for its propagation.

Answer: medium

• The unit of frequency is:

Answer: hertz

• Sound travels faster in ____ than in liquids.

Answer: solids

• ____ is an example of string instrument.

  Answer: guitar

• Larger is the amplitude, feeble is sound.

Answer: False

• Violin is a percussion instrument.

Answer: False

• Which is a percussion instrument?

Answer: drum

• In percussion instruments vibrations of ____ produce sound.

Answer: stretched membrane

• In stringed instruments vibrations of ____ produce sound.

Answer: strings

• In wind instruments vibrations of ____ produce sound.

Answer: air column

• Astronauts use ____ waves to talk to each other on moon.

Answer: radio

• ____ cannot transmit sound.

Answer:  Space

• When sound wave passes through a medium, its particles____.

Answer: vibrate

• Sound waves travel in form of:

Answer: compression and rarefaction

• Areas of high pressure are called:

Answer: compression

• Sound waves are:

Answer: longitudinal waves

• Sound travels faster in water than in air.

Answer: True

• Material medium is not necessary for sound propagation.

Answer: False

• Ultrasonic sound has a frequency:

Answer: more than audible sound

• Flash of lightning is seen after thunder is heard.

Answer: False

• Speed of sound in water is____m/s.

Answer: 1500

• A fighter aeroplane is seen before it is heard:

Answer: True

• It is possible to distinguish between sounds produced by different instruments due to their:

Answer: Overtones

• Velocity of ultrasonic waves is:

Answer: same as audible sound

• Which is a wind instrument?

Answer: flute

• A fighter plane is seen before it is heard because:

Answer: light travels faster than sound

• First person to discover that sound needed medium for propagation:

Answer: Boyle

• Speed of sound in air is____m/s.

Answer: 340

• With increase in temperature the speed of sound _____.

Answer: increases

• Large vibrations produce large sound.

Answer: True

• In humans ____ vibrates to produce sound:

Answer: vocal chord

• Voice box is also called as:

Answer: larynx

• Who has the longest vocal chords in humans:

Answer: Men

• Buzzing of bees is due to their:

Answer: flapping wings

• Sound is produced by a ____ body:

Answer: vibrating

• Which is a reed instrument:

Answer: mouth organ

• In reed instruments vibrations of ____ produce sound.

Answer: reeds

• ______ is produced due to vibration:

Answer: Sound

• In longitudinal waves particles vibrate _____ to direction of propagation

Answer: parallel

• Amplitude is measure of ____ of sound.

Answer: intensity

• Voice of women and children have higher ____.

Answer: pitch

• Frequency is:

Answer: number of cycles per second

• Sound cannot reach us from space.

Answer: True

• Amplitude is:

Answer: maximum displacement of wave

• Time period is;

Answer: time taken to complete one vibration

• Velocity of sound _____ with increase in density.

Answer: increases

• Audible range of frequency is:

Answer: between 20 to 20 KHz

• Sound above 20 KHz is called:

Answer: Ultrasonic

• Sound below 20 Hz is called:

Answer: Infrasonic

• Pigeons, squids, elephants produce ____ sound.

Answer: infrasonic

• Migratory birds use ____ sound from airflow as navigation aid

Answer: infrasonic

• Bats use ____ sound for navigation:

Answer: ultrasonic

• A dog whistle produces ____ sound.

Answer: ultrasonic

• To measure depth of sea ____ sound is used.

Answer: ultrasonic

• Stethoscope used by doctors is based on ____ of sound.

Answer: reflection

• Sensation of sound persists in our brain for:

Answer: 0.1 second

• We hear echoes only in mountains.

Answer: False

• To hear an echo, the reflecting surface should be at a minimum distance of ___m.

Answer: 17m