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PHYSICSCHAPTER # 08Wave Motion and Sound- 4 -

1.According to Hookes law the change in the length of a spring is directly proportional to:a) Its weightb) Applied forcec) Its temperatured) Current passing through itB2.Mathematically, Hookes law is stated as:a) F = mab) F = kx2c) F = kxd) F = kxD3.In simple Harmonic Motion the acceleration of a body is always directed towards and proportional to its displacement from:a) Its mean positionb) The point at which it is attached to the wallc) The point at which force is appliedd) None of theseA4.One complete round trip of a body about a mean position is called a:a) Rotationb) Vibrationc) Periodd) FrequencyB5.The maximum displacement of a vibrating body from the equilibrium position is called:a) Circumferenceb) Radiusc) Amplituded) OscillationC6.A point P is moving with uniform angular speed along a circle of radius r. The speed of its projection Q on the diameter will be:a) V = b) V = (r - x)c) V = d) V = A7.The relation between the time period T and angular velocity is given by:a) T = b) T = c) T = 2d) T = D8.The displacement of a vibrating mass attached to a spring at time t is given by:a) x = xo Sinb) x = xo Cosc) x = xo Cosd) x = xo Cos ()B9.The instantaneous velocity of a mass attached to a spring is given by:a) V = xo b) V = xo c) V = xo d) V = xo C10.The kinetic energy of a mass attached to a spring is given by:a) K.E. = kb) K.E. = k (xo2 x2)c) K.E. = k2 (xo2 x2)d) K.E. = k (x2 xo2)B11.The kinetic energy of a mass attached to a spring is maximum at:a) Mean positionb) Extreme positionc) Between extreme position and mean positiond) None of theseA12.The acceleration of a simple pendulum is given by:a) a = ( - ) xb) a = - () xc) a = - glxd) a = - () x2A13.The angular velocity of a simple pendulum is given by:a) = b) = c) = d) = lA14.The frequency of a seconds pendulum is:a) 1 Hzb) 2 Hzc) 4 Hzd) HzD15.The waves that require a medium for their propagation are called:a) Transverse wavesb) Electromagnetic wavesc) Matter wavesd) Mechanical wavesD16.The speed of propagation of a wave is given by:a) V = Tb) V = c) V = d) V = D17.Longitudinal waves are those in which the particles of the medium move:a) In the direction of wave motionb) Opposite to the direction of wave motionc) Back and forth parallel to the direction of the wave motiond) Perpendicular to the direction of wavesC18.A ripple tank is used to study:a) Nature of waterb) Properties of lightc) Various features of wavesd) None of theseC19.Wavelength and time period are related to the velocity by the relation:a) = VTb) = c) V = d) T = A20.Water waves are not perfectly transverse and their particles move in:a) Elliptical orbitsb) Circular orbitsc) Straight linesd) Slanting linesB21.The bouncing back of a wave from the boundary of two different media is known as:a) Refractionb) Transmissionc) Diffractiond) ReflectionD22.The energy transported through a unit area held perpendicular to the wave in one second is:a) b) c) d) A23.The points on the cord which do not oscillate in stationary wave are known as:a) Crestsb) Troughsc) Nodesd) AntinodesC24.The distance between two consecutive nodes or antinodes is the same and equal to:a) Half the wavelengthb) Full wavelengthc) Double the wavelengthd) Three times the wavelengthA25.When two exactly similar waves moving along the same line superimpose _______ are formed:a) Transverse wavesb) Longitudinal wavesc) Stationary wavesd) Mechanical wavesC26.If a stretched string of length l and mass m having tension T is plucked at its middle point, the frequency of the stationary waves produced in it is given by:a) f1 = b) f1 = c) f1 = d) f1 = B27.If a stretched string vibrates in n loops then its frequency fn is given by:a) fn = nf1b) fn = n2f1c) fn = f1d) fn = A28.A string of length l vibrates in n loops. The wavelength of the stationary waves produced is given by:a) = b) c) d) D29.The sonometer is used to find out:a) Frequencyb) Amplitudec) Velocityd) None of theseA30.The frequency of the tuning fork determined with the help of a sonometer is given by:a) f = b) f = c) f = d) f = D31.Longitudinal waves are also called:a) Compressional wavesb) Mechanical wavesc) Transverse wavesd) Radio wavesA32.If E is the elasticity of a medium and is its density then according to Newton the velocity of sound in that medium is given by the formula:a) V = b) V = c) V = d) V = B33.In compressional waves, the layer of medium having reduced pressure is called:a) Compressionb) Elasticityc) Noded) RarefactionD34.Sound cannot propagate through:a) Wallsb) Grassc) Woodd) VacuumD35.Velocity of sound increases with the _______ of the medium:a) Surface areab) Viscosityc) Elasticityd) DepthC37.Velocity of sound obtained from Newtons formula comes out to be:a) 280 ms-1b) 180 ms-1c) 330 ms-1d) 110 ms-1A38.After Laplaces correction, Newtons formula for the velocity changes to:a) V = b) V = c) V = r d) V = PB39.The velocity of sound obtained by Laplaces formula comes out to be approximately:a) 333 ms-1b) 222 ms-1c) 1100 ms-1d) 110 ms-1A40.The exact value of the speed of sound is:a) 339 ms-1b) 333 ms-1c) 33 ms-1d) None of theseB41.The speed of sound in the air increases approximately by _______ for each degree rise in temperature:a) 1.6 ms-1b) 2.6 ms-1c) 0.6 ms-1d) 6.1 ms-1C42.If V1 and V2 are velocities of sound at absolute temperatures T1 and T2 repectively then they can be related by the expression:a) = b) = c) = d) = D44.Intensity of sound is the _______ transmitted normally per second through a unit area:a) Number of wavesb) Number of crestsc) Number of troughsd) Amount of energyD45.Mathematically, the intensity of sound is given by:a) I = b) I = c) I = d) I = EA tA46.The SI units of intensity of sound are:a) Watt/m3b) Joules/s2c) Erg m-2sd) Watt/m2D47.Loudness of sound depends on intensity as well as the _______:a) Frequencyb) Amplitudec) Wavelengthd) EarD48.According to the Weber-Fechner Law, loudness of sound is directly proportional to the _______ of intensity:a) Squareb) Square rootc) Cube rootd) LogarithmD49.The difference in _______ of two sounds is known as intensity level:a) Loudnessb) Frequencyc) Wavelengthd) EnergyA50.The intensity level of sound of intensity I w.r.t. the intensity of faintest audible sound Io is obtained by the formula:a) I.L. = K log ()b) I.L. = KIo log Ic) I.L. = IK log Iod) I.L. = K log ()D51.The unit of intensity level of sound is called a:a) Jouleb) Belc) Lumend) HertzB52.The intensity of ordinary conversation is:a) 10-3 watt/m2b) 10-6 watt/m2c) 10-9 watt/m2d) 10-12 watt/m2B53.The intensity level of ordinary conversation is:a) 30 dbb) 40 dbc) 50 dbd) 60 dbD54.The intensity level of fainted audible sound is:a) 0.1 dbb) 10-3 dbc) 10-6 dbd) 0 dbD56.The minimum frequency that a human can detect is:a) 2 Hzb) 20 Hzc) 200 Hzd) 2,000 HzB57.The maximum frequency a human ear can detect is:a) 2,000 Hzb) 10,000 Hzc) 20,000 Hzd) 2 106 HzC58.The human ear is most sensitive in the frequency range of:a) 2,000 to 4,000 Hzb) 4,000 to 8,000 Hzc) 3,000 to 6,000 Hzd) 5,000 to 11,000 HzA59.Pitch is a sensation produced by sound that depends upon its _______:a) Velocityb) Intensity c) Amplituded) FrequencyD60.The characteristic of sound by which a sound of exactly the same pitch and loudness coming from another source is called the _______ of sound:a) Qualityb) Quantityc) Sensitivityd) IntensityA61.When two waves superimpose on each other, their combined effect is called:a) Enhancementb) Interferencec) Interactiond) None of theseB62.When two bodies of slightly different frequencies are sounded simultaneously there are rises and falls in the loudness of the resultant sound called:a) Alterationsb) Beadsc) Beatsd) None of theseC63.Dopplers effect is the change in the _______ of sound caused by the relative motion of the source and the listener:a) Velocityb) Frequencyc) Amplituded) LoudnessB64.If V is the velocity of sound and a is the velocity of the source approaching a listener then the frequency heard by the listener will be:a) = fb) = fc) = fd) = fD65.Applications of the results of scientific studies in the designs of buildings etc. is called:a) Opticsb) Wave mechanicsc) Acousticsd) StaticsC66.Echoes are produced by the _______ of sound:a) Reflectionb) Interferencec) Deflectiond) DiffractionA67.The echoing effect in which sound to be prolonged is called:a) Doppler effectb) Constructive interferencec) Beatsd) ReverberationD68.Radio and Television programmes are produced by _______ for us:a) Sound wavesb) Electromagnetic wavesc) Translatory wavesd) None of theseB69._______ medium is essential to produce sound waves:a) Materialb) Vibratoryc) Elasticd) Light A70.The waves which require medium for their motion are called _______ waves:a) Mechanical b) Vibratoryc) Simpled) None of theseA71.The waves which do not require any medium for their motion are called _______ waves:a) Mechanical b) Electromagneticc) Positived) HorizontalB72.In pendulum, the to and fro motion is called _______ motion:a) Mechanical b) Elasticc) Vibratoryd) None of theseC73.Simple Harmonic Motion is a type of _______ motion:a) Vibratoryb) Elasticc) Mechanicald) MagneticA74.A motion which repeats itself in equal intervals of time is called _______:a) Displacementb) Periodic motionc) Negatived) Vertical motionB75.The one complete round trip of a body is called _______:a) Vibrationb) Circlec) Cabled) EquilibriumA76.The time required to complete one vibration is called:a) Frequencyb) Time periodc) Amplituded) None of theseB77.The total number of vibrations executed by a body in one second is called its _______:a) Time periodb) Amplitudec) Waved) FrequencyD78.The unit of frequency is _______:a) Hertz (Hz)b) Newtonc) Cyclesd) None of theseA79.The relation of frequency and time period is shown by the formula _______:a) f = b) f = Tc) f = 2Td) None of theseA80.The maximum displacement of the body on either side of its equilibrium position is called _______:a) Displacementb) Vibrationc) Time periodd) AmplitudeD81.A force of 0.03N is required to displace a body attached to a spring through 0.2m from its equilibrium position, calculate the spring constant of the spring:a) K = 1.50 N/mb) K = 15.0 N/mc) K = 51.0 N/md) K = 0.15 N/mD82.A force of 15N is required to displace a body attached to a spring through 0.3 from its equilibrium position, calculate the spring constant of the spring:a) 50 N/mb) 5.0 N/mc) 0.5 N/md) 0.05 N/mA83.If the force applied on a spring is 50N and its displacement is 0.3m, find the value of spring constant:a) 4.7 N/mb) 76.76 N/mc) 166.67 N/md) 67.77 N/mC84.If the displacement of a spring is 0.5m and the spring constant value is 0.8N/m, then find the applied force:a) 0.4 Nb) 0.6 Nc) 0.8 Nd) 0.12 NA85.If the value of spring constant of any spring is 0.04 N/m and the value of displacement for spring is 3m, then find the required force:a) 0.12 Nb) 12.0 Nc) 1.2 Nd) 2.1 NA86.The formula for Hookes law is _______: a) F = mab) F = Kxc) Fc = d) Fc = mv2B87.When a mass m is attached to a spring then its acceleration will be _______:a) a = a3b) a = xc) a = - xd) a = x0C88.If the time period of a body which is attached with spring is 7.26 sec, then find its frequency:a) 9.13 vib s-1b) 0.614 vib s-1c) 0.138 vib s-1d) 0.194 vib s-1C89.If the time period of a body which is attached with spring is 3.43 sec, then find its frequency:a) 3.29 vib s-1b) 9.29 vib s-1c) 2.39 vib s-1d) 0.292 vib s-1D90.If the frequency of an object which is attached with a spring is 0.57 vibs-1, then find its angular speed ():a) 6.35 rad s-1b) 5.36 rad s-1c) 3.65 rad s-1d) 3.58 rad s-1D91.If the frequency of a body which is attached to a spring is 0.636 vib s-1, then find its angular speed:a) 6 rad s-1b) 5 rad s-1c) 8 rad s-1d) 4 rad s-1D92.The curve which gives the displacement as function of time is known as the wave form of _______:a) Simple Harmonic Motionb) Simple Motionc) Pendulum motiond) None of theseA93.The time period of second pendulum is _______:a) 4 secb) 3 secc) 2 secd) 5 secC94.Those pendulums which have same lengths, have also same _______:a) Natural Periodb) different frequencyc) Different periodd) None of theseA95.We can say that the frequency is the _______ of the time period T.a) Reciprocal b) Relationc) Directlyd) CrestsA96.The general equation of wave-motion is _______:a) V = b) V = fc) V = d) V = f2B97.The wave in which any particle vibrates along the perpendicular line of wave propagation, are known as _______ waves:a) Crestb) Soundc) Transversed) GeneralC99.When the wave advances through a surface of water, then water molecules move around circular paths at their _______ positions:a) Transverseb) Respective c) Inversed) None of theseB100.A human ear can hear a sound of frequency _______:a) 80Hz ----- 100Hzb) 20Hz ----- 20,000Hzc) 200Hz ----- 500Hzd) None of theseB101.The characteristic of sound by which a shrill sound can be distinguished from a grave one is called a _______ sound:a) Musical soundb) Sound wavesc) Pitch of soundd) None of theseC102.If a stretched string vibrates in a loop then its frequency fn is given by:a) fn = nf1b) fn = nf2c) fn = nf3d) None of theseA103.Velocity of sound _______ with the elasticity of the medium:a) Decreasesb) Increases c) Zerod) None of theseB104.The value of the speed of sound is _______:a) 301 m/sb) 741 m/sc) 504 m/sd) None of theseD105.The unit of intensity level of sound is called _______:a) Belb) Joulec) wattd) None of theseA