Physics [1 Mark Question Answer]

By reducing the amplitude of a sound wave, its:

• Pitch increases

• Loudness decreases

• Loudness increases

• Pitch decreases

Define the term intensity of a sound wave. State the unit in which it is measured.

Why is the loudness of the sound heard by a plucked wire increased when it is mounted on a sound board?

Name the unit in which loudness of sound is measured.

Two waves of the same pitch have amplitudes in the ratio 1:3. What will be the ratio of frequencies?

Two waves of the same pitch have amplitudes in the ratio 1:3. What will be the ratio of loudness?

If the amplitude of a wave is doubled, what will be the effect on its loudness?

Name the characteristic of the sound affected due to a change in its frequency.

Name the characteristic of the sound affected due to a change in its wave form.

Name the characteristic of the sound affected due to a change in its amplitude.

State the factor that determine the quality of the note.

State the factor that determine the loudness of the sound heard.

State the factor that determine the pitch of a note.

How is it possible to recognize a person by his voice without seeing him?

Two identical guitars are played by two persons to give notes of the same pitch. Will they differ in quality? Give a reason for your answer.

Name the characteristic which enables one to distinguish the sound of two musical instruments even if they are of the same pitch and same loudness.

The frequencies of notes given by flute, guitar and 500 Hz. Which one of these has the highest pitch?

Name the subjective property of sound related to its frequency.

Name one source of sound causing noise pollution.

What is the safe limit of sound level in dB for our ears?

Name the unit used to measure the sound level.

What adjustments would you make for tuning a stringed instrument for it to emit a note of a desired frequency?

State two ways of increasing the frequency of vibrations of a stretched string.

State one way of increasing the frequency of a note produced by an air column.

Why is a loud sound heard at resonance?

On What factors does the natural frequency of vibration of a body depend?

What is meant by the natural frequency of vibration of a body?

What do you understand by free vibrations of a body?

Give one example to illustrate forced vibrations.

What are forced vibrations?

A tuning fork is set into vibration in air. Name the kind of vibrations it executes.

A blade, fixed at one end, is made to vibrate by pressing its other end and then releasing it. State one way in which the frequency of vibrations of the blade can be lowered.

To detect the obstacles in their path, bats produce:

• Infrasonic waves

• Ultrasonic waves

• Electromagnetic waves

• Radio waves

A wave passes from one medium to another medium. Mention the property of the wave which does not change.

A wave passes from one medium to another medium. Mention the property of the wave which changes.

Define wave velocity term in relation to a wave.

Define wavelength term in relation to a wave.

Define amplitude term in relation to a wave.

What are mechanical waves?

Give one use of sound ranging.

What is meant by sound ranging?

State the use of echo by a bat, dolphin and fisherman.