Forced Oscillations

Q.

Name the three types of musical instruments. Explain how music is produced in percussion instruments.

Q.

What are the forced vibrations ? Give one example to illustrate your answer.

Q.

If the velocity of sound in air is $340\mathrm{m}{\mathrm{s}}^{-1}$, calculate frequency when the wavelength is $0.85\mathrm{m}$.

Q. Why resonance occurs?

Q.

State two ways of increasing the frequency of vibration of a stretched string can be increased.

Q.

State Two differences between the natural and forced vibrations.

Q.

How does the frequency of sound given by a stretched string depend on its (a) length, (b) tension ?

Q.

Give one example of damped vibrations.

Q.

When a body vibrates under a periodic force, the vibrations of the body are :

(a) natural vibrations (b) damped vibrations

(c) forced vibrations (d) resonant vibrations.

Q.

A blade, fixed at one end, is made to vibrate by pressing its other end and then releasing it. State one way in which the frequency of vibrations of the blade can be lowered.

Q.

When a tuning fork is hit against rubber pad, its prongs execute simple harmonic motion.

1. 1.16s

2. 3.48s

Q. Question 1
How does the sound produced by a vibrating object in a medium reach your ear?

Q.

What may be considered " simple applications " of different types of vibrations( including resonance).....(As given in the ICSE syllabus )

Q.

What adjustments would you make for tuning a stringed instrument for it to emit a note of a desired frequency ?

Q.

State two ways of increasing the frequency of vibrations of a stretched string.

Q.

What is the motion of the particle of a medium about their mean positions?

Q. 1) explain why musical instruments like guitar are provided with hollow box.
2)when a vehicle driven at high speed , sometimes rattling sound is heard. explain why.

Q.

A person on a pier observes a set of incoming waves that have a sinusoidal form with a distance of 1.6 m between the crests. If the wave lapse against the pier every 4 s, what are:

(a) the frequency?

Q.

On keeping the stem of a vibrating tuning fork on the surface of a table, a loud sound is heard. Give reason.

Q.

The maximum displacement of the particle on either side of the equilibrium position is called ___ .

Q.

A large drum produces a louder sound than a small drum. Why?

Q. What are forced vibrations ? Give one example to illustrate your answer.

Q.

Which is vibrating when the following sounds are produced

1. the buzzing of a bee

2. the sound of a flute

3. the sound of a tuning fork

4. the sound of a sitar

Q.

1. Forced vibration, Frequency of vibration of A, Amplitude decreases, Resonance

2. Forced vibration, Frequency of vibration of A, Amplitude increases, Resonance

3. Free vibration, Its length, Amplitude increases, forced vibration

4. Free vibration, Independent, Amplitude increases, Resonance

Q.

In the given figure what kind of instrument is played by the man at an indian music concert?

On what factor does the frequency of the sound depends?

1. Jaltarang, inversely proportional to the length of the vibrating water column

2. Jaltarang, directly proportional to the length of the vibrating air column

3. Jaltarang, inversely proportional to the length of the vibrating air column

4. Tabla, directly proportional to the length of the vibrating drum surface

Q.

Define sound box.

Q.

When a body vibrates under a periodic force, the vibrations of the body are :

1. resonant vibrations

2. natural vibrations

3. damped vibrations

4. forced vibrations

Q.

How does the loudness of sound depends on the vibrating area.

Q.

The length of a seconds pendulum on the Earth to be decreased to make it as a seconds pendulum on the surface of the Moon is _________ times its length on the Earth.

1. $\frac{1}{6}$

2. $\frac{11}{6}$

3. $\frac{5}{6}$

4. $\frac{7}{6}$

Q.

It was a bright and breezy day in New York, the air was a cool 20 degrees Celsius, when Tony Stark, a.k.a the Iron Man's day took a dramatic turn as he got news of Mandarin's attack in the windy city of Chicago, and decided to immediately fly over there, in his iron body-armor, whose cavity had enough space to fit a man of 4, 984 $c{m}^3$ in volume, but not more.

Being a smart man, he did a quick check of two important things - his own body volume, which he found was currently 4.980 $c{m}^3$, and the temperature in Chicago, which was a cold 8 degrees Celsius that day. Knowing that the coefficient of volume expansion for iron, $\gamma$, is $33.3\times {10}^{-6}$${/}^{\circ }C$, he decided to go. Check if that was a smart decision, by finding out whether the new volume of the iron suit when he reaches Chicago will crush him or not.

1. (it's going to be an uncomfortable encounter)
2. (he is going to be alright)
3. (he will have to take his suit off and call the Hulk)
4. (perfect fit!).