Physics Notes for 10th Class Chapter-11

Old people cannot hear sound even above ____________

How does sound travel from its source to your ear?

Astronauts in space need to communicate with each other by radio links because______

For a normal person audible frequency range for sound wave lie between____________

The method used to absorb undesirable sound by soft and porous surface is called ________

Which bird fly easily between wires in the black room.

For hearing distinct echoes, the minimum distance of obstacle from source of source of sound must be__________

Loudness of sound depends on_________

The sensation of sound persists in our brain about ___________

Corresponds to irregular and sudden vibrations produced by some sound ___________

The speed of sound in air at a2 atm pressure and at room temperature (21°C) is _______

The study of sound is called______

____________ is the characteristic of sound by which we can. distinguish between a shrill and a grave sound.

According to wave equation v= fλ the wavelength of ultra-sonic waves are ____________

The Level of noise recommended in most of countries is ________

Which are the acoustic protection except ___________

Which form of energy is sound?

Voice of Child is _______________

Pitch of sound depends on_____________

Intensity of loudest audible sound is__________

• 10^-12Wm^-2
• 1 Wm^-2
• 20Wm^-2
• All of these

Which Option is Correct ?

Intensity of whispering is ____________

• 10^-5 Wm^-2
• 10^-8Wm^-2
• 10^-9Wm^-2
• 10^-12 Wm^-2

Which Option is Correct ?

The range of the frequency which human ear can hear is called___________

Which is an example of a longitudinal wave.

The loudness of sound is directly proportional to logarithm of intensity, this Law is called _______

Characteristic by which we can distinguish between two, sounds of same loudness and pitch is called _____

By which waves small cracks can appear___________

Refractions are places where air is slightly _____________ than the surrounding air.

Intensity of faintest sound is __________

• 10¹² Wm^-2
• 10^-12 Wm^-2
• 10^-8Wm^-2
• 10^-9Wm^-2

Which Option is Correct ?

Intensity is a ____________quantity.

Audible frequency range is ____________

Sound waves with frequency less than 20Hz are called _____________

The speed of sound in air was first scene measured in ____________

Sound can travel only in presence of _______

Noise correspond ____________ vibration.

The amplitude of 100 dB sound is ___________

Researcher in __________ observed giraffes to stop and wait for the others that were out of sight.

Ultrasound is the frequency of sound higher than ___________

Noise has negative effects on human health it causes except ____________

Powerful ultrasound is now being used to remove blood clot from _________

When the frequency of sound wave is increased, them which of following decrease?

The speed of sound in solid is about _____________ times that in gases.

Frequency of silent whistle Lies between__________

Such sound Which are pleasant to our ears are named as ____________

Bats can hear Frequencies up to_______________

Ultrasonics are used to locate under water depth the technique is called_____________

The Loudness of a sound is most closely related to its_______

Multiple reflections called ___________

Mice can hear frequencies up to ___________

Sound is produced by__________

For a normal person, audible frequency range for sound wave lie between_________

_____________waves carry more energy and higher frequency than sound waves.

By using an ____________ we can see sound wave.

Compressions are places Where air is slightly _______________ than the surrounding air.

By ultrasonic waves ____________ can be destroyed.

1 bell is equal to ____________

The speed of sound in solid is______________ than liquid and air.

Ultrasonics are used to measure the depth of Water by____________

We hear sound produce by musical instrument such as _____________

When the frequency of a sound wave is increased, which of the following will decrease?

Such sounds which are unpleasant to our ears are called ____________

Distance between two consecutive compressions and rarefactions is the _______ of sound wave.

The intensity of sound depends on the ___________ of sound.

The speed of sound varies with_______________

Sound is ____________Wave.