(English Medium) ICSE Class 10 - CISCE Question Bank Solutions

State two conditions for an echo to take place

What do you understand by the loudness of sound?

In which units is the loudness of sound measured?

State the safe limit of sound level in terms of decibel for human hearing.

A person standing between two vertical cliffs and 480 m from the nearest cliff shouts. He hears the first echo after 3s and the second echo 2s later. Calculate:

1)The speed of sound.

2) The distance of the other cliff from the person

Name one property of waves that do not change when the wave passes from one medium to another.

State one important property of waves used for echo depth sounding.

In the following diagram an arrow shows the motion of the coil towards the bar magnet.
(1) State in which direction the current flows, A to B or B to A?
(2) Name the law used to come to the conclusion.

A person is standing at the seashore. An observer on the ship which is anchored in between a vertical cliff and the person on the shore fires a gun. The person on the shore hears two sounds, 2 seconds and 3 seconds after seeing the smoke of the fired gun. If the speed of sound in the air is 320 ms-1 then calculate:

1) the distance between the observer on the ship and the person on the shore.

2) the distance between the cliff and the observer on the ship.

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

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

Name three characteristics of a musical sound.

1. Which of the following quality determines the loudness of a sound wave?
   
   1. wavelength
   2. frequency and
   3. amplitude
2. How is loudness related to the quantity mentioned above in part (a)?

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

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

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

How does the wave pattern of a loud note differ from a soft note? Draw a diagram.

Name the unit in which loudness of sound is measured.

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

State three factors on which loundess of sound heard by a listener depends.