(English Medium) ICSE Class 10 - CISCE Important Questions for Physics

A certain sound has a frequency of 256 hertz and a wavelength of 1.3 m.

1) Calculate the speed with which this sound travels

2) What difference would be felt by a listener between the above sound and another sound traveling at the same speed, but of wavelength 2.6 m?

The ratio of amplitude of two waves is 3:4. What is the ratio of their loudness?

The ratio of the amplitude of two waves is 3:4. What is the ratio of their Frequencies?

State the ways by which the frequency of transverse vibrations of a stretch string can be increased

Give one reason for Ultrasonic waves use for echo depth sounding purpose.

Why are the Ultrasonic waves are not audible to us?

What is an echo

State two conditions for an echo to take place

Name the phenomenon involved in tunning a radio set to a particular station

Define the Resonance phenomenon?

What do you understand by the loudness of sound?

In which units is the loudness of sound measured?

Draw a graph between displacement and the time for a body executing free/natural vibrations.

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

Name the characteristic of sound in relation to its waveform

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

In the diagram below, A, B, C, D are four pendulums suspended from the same elastic string PQ. The length of A and C are equal to each other while the length of pendulum B is smaller than that of D. Pendulum A is set into a mode of vibrations

1) Name the type of vibrations taking place in pendulums B and D?

2) What is the state of pendulum C?

3) State the reason for the type of vibrations in pendulum B and C.

What are mechanical waves?

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

The adjacent diagram shows three different modes of vibrations P, Q and R of the same string. 

(i) Which vibration will produce a louder sound and why?
(ii) The sound of which string will have maximum shrillness?
(iii) State the ratio of wavelengths of P and R.