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

A bucket kept under a running tap is getting filled with water. A person sitting at a distance is able to get an idea when the bucket is about to be filled.
(i) What change takes place in the sound to give this idea?
(ii) What causes the change in the sound?

Give two examples of forced vibrations.

What do you mean by resonance? When does resonance occur?

When acoustic resonance takes place, a loud sound is heard. Why does this happen? Explain.

Explain why stringed musical instruments, like the guitar, are provided with a hollow box.

State two ways in which resonance differs from forced vibrations.

The rearview mirror of a motorbike starts vibrating violently at some particular speed of the motorbike. What is the name of the phenomenon taking place? Why does the happen?

The rearview mirror of a motorbike starts vibrating violently at some particular speed of the motorbike, what could be done to stop the violent vibrations.

Explain why are soldiers asked to walk out of step while crossing bridges?

Explain why does the rear mirror of a motorbike start Vibrating Violently, at some particular speed of motorbike?

Explain a tuning fork (vibrating) is held close to ear. One hears a faint sound. The same vibrating tuning fork is placed on table, such that its handle is in contact with table, one hears a loud sound.

A vibrating tuning fork is placed over the mouth of a burette filled with water. The tap is opened and the water level gradually falls. It is observed that the sound becomes the loudest for a particular length of the air column. What is the name of the phenomenon taking place when this happens? Why does the sound become the loudest?

When a tuning fork, struck by a rubber pad, is held over a length of the air column in a tube, it produces a loud sound for a fixed length of the air column. Name the above phenomenon. How does the frequency of the loud sound compare with that of the tuning fork? State the unit for measuring loudness.

Explain a person walking past a railway line, in the middle of night hears a ringing sound along with the sound of his footsteps.

A string stretched between its ends is made to vibrate by placing the stem of a vibrating tuning fork at its one end. State three ways how you will increase the frequency of note produced by the string.

Explain Why are stringed musical instruments provided with large sound boxes?

What do you understand by free (or natural) vibrations?

What do you understand by forced vibrations?

What are the factors that affect the frequency of a vibrating string and how do they affect the frequency?

What do you understand by free vibrations of a body? Draw a displacement-time graph to represent them. Given one example.