(English Medium) ICSE Class 9 - CISCE Question Bank Solutions

What kinds of waves are produced in solids, liquids, and gases?

Express the order of magnitude of the following quantity:

12578935 m

What is approximate value of the speed of sound in iron as compared to that in air? Illustrate your answer with a simple experiment.

Express the order of magnitude of the following quantity:

222444888 kg

Express the order of magnitude of the following quantity:

0.000,000,127 s

Express the order of magnitude of the following quantity:

0.000,000,000,00027 m

Amongst the various physical measurements recorded in an experiment, which physical measurement determines the degree of accuracy?

A continuous disturbance is created on the surface of water in a ripple tank with a small piece of cork floating on it. Describe the motion of the cork. What does the motion of the cork tell about the disturbance?

Draw a displacement-time graph for water wave.

State the formula for calculating percentage error

200 waves pass through a point in one second. Calculate the time period of wave.

A bat emits an ultrasonic sound of frequency 0.25 MHz. Calculate the time in which one vibration is completed.

State the factors which determine the number of significant figures for the calculation of the final result of an experiment.

The wavelength of the vibrations produced on the surface of water is 2 cm. If the wave velocity is 16 ms^-1, calculate:

1. no. of waves produced in one second
2. time required to produce one wave.

A continuous progressive transverse wave of frequency 8 Hz moves across the surface of a ripple tank

With reference to the frequency, describe the movement of water on the surface

A continuous progressive transverse wave of frequency 8 Hz moves across the surface of a ripple tank

If the wavelength of the transverse wave is 32 mm, calculate the speed with which wave travels across the surface of the water.

A thin metal plate is placed against the teeth of cog wheel. Cog wheel is rotated at a speed of 120 rotations per minute and has 160 teeth. Calculate:

1. frequency of node produced.
2. speed of sound, if wavelength is 1.05 m.
3. what will be the effect when the speed of cog wheel is doubled?

A sound wave of wavelength 1/3 m has a frequency 996 Hz. Keeping the medium same, if frequency changes to 1328 Hz. Calculate

1. velcoity of sound
2. new wavelength.

Two tuning forks A and B of frequencies 256 Hz and 192 Hz respectively are vibrated in air. If the wavelength of A is 1.25 m, calculate the wavelength produced by B.