Q.1
The frequency of fundamental note emitted by a string of length l, clamped at both ends is ( v=velocity of sound in string) ..[ CPMT 1993]
  • a)v/l
  • b) 2v/l
  • c)v/2l
  • d)v/4l
Q.2
Two organ pipes both closed at one end, have length l and l+Δl. Neglect end-correction. if the velocity of sound in air is V. ten the number of beats per second is ..[ BHU 1995]
  • a) V/ 4l
  • b) V/2l
  • c)(V/4l2) Δl
  • d)(V/2l2)Δl
Q.3
The amplitude of vibration of any particle in a standing wave, produced along a stretched string depends on [ EAMCET 1991]
  • a) Frequency of incident wave
  • b) Time period of reflected wave
  • c)Location of particle
  • d)Time
Q.4
Which of the following statement is wrong:
  • a) In an open pipe the fundamental frequency is v/2L
  • b) In a closed pipe the closed end is displacement node
  • c) In an open pipe only the odd harmonics of fundamental frequency are present
  • d) In a closed pipe the fundamental frequency is v/4L
Q.5
Air is blown at the mouth of tube ( length=25cm and diameter=3cm) closed at one end. Velocity of sound is 330 m/sec. The sound which is produced will correspond to the frequencies:.. [ CPMT 1986]
  • a)330 Hz
  • b) Combination of frequencies 330 Hz, 662Hz, 990 Hz, 1320Hz,...
  • c)Combination of frequencies 330 Hz, 990Hz, 1650 Hz, 2310Hz,...
  • d)Combination of frequencies 330 Hz, 990Hz, 1500 Hz, 1200Hz,...
Q.6
The end correction for the vibrations of air column in a tube of circular cross-section will be more if the tube is ..[ CPMT 1985]
  • a) Reduced in length
  • b) Increased in length
  • c)made thinner
  • d)Widened
Q.7
An air-column in a pipe, which is closed at one end, will be in resonance with a vibrating tuning fork of frequency 256Hz, if the length of the column is cm is ( velocity of sound in air is 340 m/s) [ CBSE 1997]
  • a) 21.25
  • b) 125
  • c) 62.5
  • d) 33.2
Q.8
A closed organ pipe and an open organ pipe have their first overtones identical in frequency. Their length are in the ratio..[ MPPMT 1987]
  • a)1:2
  • b) 2:3
  • c)3:4
  • d)4:5
Q.9
The radius, density and tension of a string A are twice the radius, density and tension of another string B. If the length of the strings are equal, the ratio nA / nB of their frequencies of vibration, will be ..[ MPPMT 1990]
  • a) 1
  • b) 2
  • c)1/2
  • d)1/4
Q.10
The sonometer wire is vibrating in the second overtone. We may say that there are
  • a) Two nodes and two antinodes
  • b) One node and two antinodes
  • c)Four nodes and three antinodes
  • d)Three nodes and three antinodes
Q.11
A sonometer wire vibrates with frequency n. It is replaced by another wire of three times the diameter, if tension and other parameters of the wire will be: [ CPMT 1985]
  • a) 9n
  • b) 3n
  • c) n/3
  • d) n/9
Q.12
When a tuning fork vibrates, the waves produced in the fork are
  • a)longitudinal in stem and transverse in prong
  • b) longitudinal in prong and transverse in stem
  • c)longitudinal in both prong and in stem
  • d)transverse in both prong and in stem
Q.13
Which one of the following is a simple harmonic motion [ CBSE 1994]
  • a) Ball bouncing between two rigid vertical walls
  • b) Particle moving in a circle with uniform speed
  • c)Wave moving through a string fixed at both ends
  • d)Earth spinning about its own axis
Q.14
Energy is not carried by [ M.N.R 1990]
  • a)transverse progressive waves
  • b) longitudinal progressive waves
  • c)stationary waves
  • d)electromagnetic waves
Q.15
A tuning fork vibrating with sonometer having 20 cm wire produces 5 beats per second. the beat frequency does not change if the length of the wire is changed to 21 cm the frequency of the tuning fork ( in Hertz ) must be [ MNR 1991]
  • a) 200
  • b) 210
  • c) 205
  • d) 215
Q.16
String of wires of same material of length l and 2l vibrate with frequencies 100 and 150 respectively. The ratio of their tension is [ MPPMT 1990]
  • a)2:3
  • b) 3:2
  • c)1:9
  • d)1:3
Q.17
Four wires of identical lengths, diameters and materials are stretched on a sonometer box. The ratio of their tensions is 1:4:9:The ratio of their fundamental frequencies is .. [ CPMT 1989]
  • a) 16:9:4:1
  • b) 4:3:2:1
  • c)1:2:3:4
  • d)1:4:9:16
Q.18
A hollow metallic tube of length L and closed at one end produces resonance with a tuning fork of frequency n. the entire tube is then heated carefully so that at equilibrium temperature its length changes by l. If the change in velocity V of the sound is v the resonance will now be produced by tuning fork whose frequency is [ CPMT 1988]
  • a)
    ch-10_qn-232choice_img_no1.png
  • b)
    ch-10_qn-232choice_img_no2.png
  • c)
    ch-10_qn-232choice_img_no3.png
  • d)
    ch-10_qn-232choice_img_no4.png
Q.19
The velocity of sound in air is 330 metre/sec. the fundamental frequency of an organ pipe open at both ends and of length 0.3 metres will be [ MNR 1993]
  • a)200 Hz
  • b) 550 Hz
  • c)300 Hz
  • d)275 Hz
Q.20
A sonometer wire is in unison with tuning fork. Keeping the same tension, the length of the wire between the bridges is doubled. the tuning fork can be still in resonance with the wire, provided the wire now vibrates in [ MPPMT 1989]
  • a)4 segments
  • b) 6 segments
  • c)3 segments
  • d)2 segments
Q.21
the length of sonometer wire AB is 110 cm. Where should the bridges be placed from A to divide fundamental frequencies in the ratio of 1:2:3 .. [ CBSE 1995]
  • a) 30 cm and 90 cm
  • b) 60 cm and 90 cm
  • c)40 cm and 80 cm
  • d)none of these
Q.22
A stretched string 0.25 cm has a frequency of f=300Hz in the fundamental mode. The velocity of transverse wave in the string is ..[ EAMCET 1988]
  • a) 75 m/s
  • b) 150 m/s
  • c) 330 m/s
  • d) 1200 m/s
Q.23
Air is blown at the mouth of a tube ( length=25cm, diameter=2cm) open at both the ends as shown in figure. Velocity of sound is 330m/sec. The sound emitted by the tube will have all the frequencies in the group..[ CPMT 1989]
ch-10_que_no-237_img_no1.png
  • a)660, 1320, 1980 Hz
  • b) 660, 1000, 3300Hz
  • c)302, 664, 1320Hz
  • d)330, 990, 1690Hz
Q.24
An object of specific gravity ρ is hung from a thin steel wire. The fundamental frequency for transverse standing waves in the wire is 300Hz. The object is immersed in water so that one half of its volume is submerged. The new fundamental frequency, in Hz is ..[ IIT1995]
  • a)
    ch-10_qn-238choice_img_no1.png
  • b)
    ch-10_qn-238choice_img_no2.png
  • c)
    ch-10_qn-238choice_img_no3.png
  • d)
    ch-10_qn-238choice_img_no4.png
Q.25
A long glass tube is held vertically in water. A tuning fork is struck and held over the tube. Strong resonance are observed at two successive length 0.5m and 0.84m above the surface of water. If the velocity of sound is 340m/s, then the frequency of the tuning fork is .. [ SCRA 1994]
  • a) 128 Hz
  • b) 256 Hz
  • c)284 Hz
  • d)500 Hz
Q.26
A string fixed at both the ends is vibrating in two segments. The wavelength of the corresponding wave is [ UPSC 1994]
  • a) l/4
  • b) l/2
  • c) l
  • d) 2l
Q.27
A wire of tension 225 N produces 6 beats per second when it is tune with fork, when the tension changes to 256 N, it is again tuned with same tuning fork, the number of beats remain unchanged, the frequency of tuning fork will be [ Raj.PET 1996]
  • a)256
  • b) 225
  • c)280
  • d)186
Q.28
The fundamental frequency of open pipe is 30 C/sec, the fundamental frequency of closed pipe of same length will be [ Raj.PET 1996]
  • a) 10 C/sec
  • b) 20 C/sec
  • c)30 C/sec
  • d)15 C/sec
Q.29
A cylindrical tube, open at both ends, has a fundamental frequency n. If one of the ends is closed, the frequency becomes/ remains [ UGET 1995]
  • a)0.5n
  • b) n
  • c)2n
  • d)4n
Q.30
An air column in a pipe closed at one end will be inn resonance with a vibrating tuning fork of frequency 680Hz if the length of the column in metre be [ ISM Dhanbad 1994]
  • a) 0.25
  • b) 0.105
  • c) 0.375
  • d) 0.5
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