Question 5 :
If a particle is oscillating on the same horizontal plane on the ground.
Question 6 :
"A bird flapping its wings circles around a clock tower". Which part of the motion is periodic and oscillatory ?
Question 10 :
The characteristics of sound which enables us to distinguish two musical sounds coming from different sources but having the same frequency and loudness is :<br/>
Question 12 :
<span>A sound wave completes $24$ cycles in $0.8\;s$. </span>The time period of the wave would be:
Question 13 :
If a body moves back and forth repeatedly about a mean position, it is said to possess
Question 15 :
Not all kinds of vibration in the material bodies produce sensation of sound. True or false
Question 17 : <div>State whether true or false.<br/></div>All periodic motion need not be oscillatory but all oscillatory motions<br/>are periodic.
Question 21 :
The sound from a mosquito is produced when it vibrates its wings at an average rate of $500$ vibrations per second. What is the time period of the vibration?
Question 24 :
An object oscillates 50 times in one second. What would be its frequency?
Question 25 :
An object attached to one end of a spring makes 20 vibrations in 10s. Its frequency is
Question 26 :
A sound is said to be of rich quality when it contains
Question 27 : Each of the properties of sound listed in column A primarily depends on one of the quantities in column B. Choose the matching pairs from two columns.<br><table class="wysiwyg-table"><tbody><tr><td><b>Column A</b></td><td><b>Column B</b></td></tr><tr><td>Pitch</td><td>Waveform</td></tr><tr><td>Quality</td><td>Frequency</td></tr><tr><td>Loudness</td><td>Intensity</td></tr></tbody></table>
Question 28 :
Which of the following is independent of the remaining three for a sound wave?
Question 29 :
The musical sounds produced by different singers can be differentiated on the basis of.
Question 30 :
Which of the following characteristics of sound will change if there is a change in its waveform ?
Question 31 :
An empty earthen pitcher is kept under a water tap and starts filling with water as the tap is opened. The pitch of the sound produced
Question 35 :
When we hit a thin plastic ruler firmly on a bench:
Question 37 :
E<span>xplain why, if we strike a table lightly, we hear a soft sound but if we hit the table hard, a loud sound is heard.</span>
Question 38 :
The time<span> period</span> of a vibrating body is $0.01\;sec$. Its frequency will be :
Question 40 : What conclusion can be obtained from the observation that when the prongs of a sound making tuning fork touch a beaker, the water gets splashed?<p></p>
Question 41 :
A to and fro motion by an object is also called
Question 42 :
It is possible to recognize a person by hearing his voice even if he is hidden behind a solid wall. This is due to the fact that his voice:<br/>
Question 45 :
The number of cycles an oscillator completes in each second is called its _______________.
Question 47 :
Vibration of air column produces sound in which of the following instruments?
Question 49 : <div>State whether true or false.<br/></div>Piston of the engine in a motor car exhibits <span>Oscillatory motion.</span>
Question 50 : <p>Characteristics of sound which enables us to distinguish between two sound of same loudness and pitch:</p>
Question 51 :
A particle of mass $m$ moves in a straight line. If $v$ is the velocity at a distance $x$ from a fixed point on the line and $v^{2}=a-bx^{2}$, where $a$ and $b$ are constant then:
Question 53 :
The displacement of a particle is represented by the equation $y=sin^3(\omega t)$. The motion is
Question 56 :
Assertion: Every vibrating body is a source of sound.
Reason: All sounds are audible.
Question 57 :
Which characteristic of a sound helps you to identify your friend by his voice while sitting with others in a dark room?
Question 58 :
A thin spherical shell of mass $M$ and radius $R$ has a small hole. A particle of mass $m$ is released at its mouth. Then
Question 59 :
Two tuning forks $A\;and\;B$ vibrate with frequencies in the ratio $3\,\colon\,8$ and their wavelengths in the ratio $4\,\colon\,5$. The tuning fork $A$ produces relatively ......... .
Question 63 :
The number of vibration/ oscillation executed per second is known as :
Question 64 :
H<span>ow does a sound making object differ from one that is silent?</span>
Question 65 : <div>State whether true or false.<br/></div>The needle of a moving sewing machine executes o<span>scillatory motion.</span>
Question 66 :
The ............ of sound is that characteristic which enables us to distinguish one sound from another having the same pitch and loudness.
Question 67 :
<span>Uniform circular motion can also be represented by a simple harmonic oscillator.<br>State whether given statement is True/False?</span>
Question 68 :
If the frequency of sound wave in air is doubled, its wavelength.
Question 69 :
An object swinging on the end of a string forms a simple pendulum. Some students (and some texts) often cite the simple pendulum's motion as an example of SHM. That is not quite accurate because the motion is really
Question 70 :
A transverse wave of frequency 50 Hz is reflected from a wall. 50% of the energy of the wave is lost at the wall. The frequency of the reflected wave will be
Question 71 :
"The motion of a particle with a restoring force gives oscillatory motion". Which of the following force can be a restoring force for the oscillatory motion.
Question 77 :
The bye-bye gesture, we do using hands is an example of
Question 78 :
The pitch of sound made by a vibrating wire does not depend on its -
Question 79 :
When we hold a thin plastic ruler firmly on a bench:
Question 81 :
The time period of a sound wave from a piano is $1.18\times10^{-3} s$. Find its frequency.
Question 83 :
Simple harmonic motion (SHM) is a technical term used to describe a certain kind of idealized oscillation. Practically all the oscillations that one can see directly in the natural world are much more complicated than SHM. Why then do physicists make such a big deal out of studying SHM?
Question 86 :
An oscillator is producing FM waves of frequency 2kHz with avariation of 10kHz. The modulating index=?
Question 87 :
Which of the following equation does not represent a simple harmonic motion:
Question 88 :
A particle performs 20 vibrations in 5 secs. The time period of vibration is
Question 89 :
A small bee produces sound , while it moves. The sound is created due to
Question 90 :
Assertion: The pitch of wind instruments rises and that of string instruments falls as an
Reason: When temperature rises, speed of sound increases but speed of wave in a string fixed at both ends decreases.
Question 91 :
When a flute is blown, the air inside it gets compressed and produces sound but does not vibrate. True or false.
Question 92 :
If a vibrator strikes the water $50$ times in $5s$, then the frequency of wave is
Question 93 :
<span>The frequency of a wave traveling at a speed of $500 m/s$ is $25 Hz$. Its time period will be :<br/></span>
Question 95 :
To change the quality of sound produce by an instrument, we need to vary the :<br/>
Question 96 :
A transverse wave of frequency 100 Hz passes through water. The refractive index of water is 1.33, what will be the frequency of the wave in water
Question 97 :
Assertion: Every vibrating body is a source of sound
Reason: All sounds are audible
Question 98 :
A normal man is unable to hear the sound emitted by source. Out of the possible reasons, the one which is not applicable is
Question 99 :
The piston in a petrol engine goes up and down 3000 times per minute. For this engine, calculate the period of the piston.
Question 100 :
The sounds having frequency of $20$ Hz to $20,000$ Hz are
Question 101 :
A sound of intensity $I$ is greater by $3.0103\ dB$ from another sound of intensity $10\ nW\ c{ m }^{ -2 }$ . The absolute value of intensity of sound level $I$ in ${ Wm }^{ -2 }$ is :<br/>
Question 102 :
A simple harmonic oscillator of angular frequency 2 rad $s^{-1}$ is acted upon by an external force $F= sin tN.$ If the oscillator is at rest in its equilibrium position at t=0, its position at later times is proportional to
Question 103 :
Assertion: When we start filling an empty bucket with water, the pitch of sound produced goes on decreasing.
Reason: The frequency of man voice is usually higher than that of woman.
