ICSE ICSE Class 8 - CISCE Question Bank Solutions

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

Name the unit in which the loudness of sound is expressed.

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

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

Name the characteristic of sound related to its frequency

Name and define the characteristic which enables one to distinguish two sounds of same loudness, but of different frequencies, given by the same instrument.

All wires used in electric circuits should be covered with

Standing at a distance, how is it possible to detect the filling of bucket under a water tap by hearing the sound? 

Figure shows two jars A and B containing water up to different heights. Which will produce sound of higher pitch when air is blown on them?

Fuse wire is an alloy of

A fuse wire should have

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.

Two musical notes of the same pitch and same loudness are played on two different instruments. Their wave patterns are as shown in figure.

How do they differ in
(a) loudness,
(b) pitch and
(c) quality

When the switch of an electric appliance is put off, it disconnects

State the factors that determine
(a) the pitch of a note.
(b) the loudness of the sound heard.
(c) the quality of the note.

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

(a) amplitude (b) waveform (c) frequency.

Figure shows four waves A, B, C, and D

Name the wave which shows
(a) a note from a musical instrument,
(b) a soft note
(c) a shrill note.

How is the pitch of sound in a guitar changed if (a) thin wire is used, (b) wire under less tension is used?

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

1. loudness,
2. pitch?

Two waves have frequencies 256 Hz and 512 Hz, but same amplitude. Compare their (i) loudness, and (ii) pitch