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40 questions
A source of sound of frequency 500 Hz is moving towards on observer with velocity 30 ms–1. The speed of sound is 330 ms–1. The frequency heard by observer will be:
550 Hz
458.3 Hz
530 Hz
454.5 Hz
The velocity time graph of – harmonic oscillation is shown the figure below, the frequency of oscillation is
12.25 Hz
2.5Hz
33.3 Hz
50Hz
A body executes SHM. The PE, KE and TE are measured as a function of displacement "x". Which of the following statements is true
TE = 0 when x = 0
KE is maximum when x is maximum
KE is maximum when x = 0
PE is maximum when x = 0
Which of the following quantity connected with SHM do not vary periodically?
Total energy
Displacement
Velocity
Acceleration
An observer on the sea shore observes 54 waves reaching the cost per minute. If the wavelength is 10 m. The velocity is
18 ms–1
36 ms–1
9 ms–1
54 ms–1
The distance between two consecutive antinodes is 0.5m. The distance travelled by the wave in half the time period is
2 m
0.5 m
1 m
0.25 m
A particle is executing S.H.M, then the graph of acceleration as a function of displacement is
ellipse
circle
parabola
straight line
The phase difference between the particles vibrating at two consecutive nodes is:
π
Zero
2π
π/2
The frequency of an open organ pipe is "n". If one end is closed, then its fundamental frequency will be:
n/2
3n/4
n
2n
The ratio of frequencies in a stretched string is:
1 : 2 : 3
1 : 3 : 5
3 : 2 : 1
2 : 4 : 6
The third harmonic in an open organ pipe is known as
Second overtone
First overtone
Fundamental frequency
Third overtone
On decreasing the temperature, the frequency of an organ pipe becomes
Decrease
Infinity
Increase
Equal
In a stationary wave the distance between consecutive antinodes is 25 cm. If the wave velocity is 300 ms–1, then the frequency of wave will be
750 Hz
600 Hz
300 Hz
150 Hz
A sitar wire vibrates with frequency of 330 vibrations per second. If its length is increased three times and tension is increased four times, then the frequency of the wire will be
440 Hz
220 Hz
110 Hz
330 Hz
When a wave goes from one medium to another, there is a change in the
velocity
frequency
wavelength
Both velocity and wavelength
The length of a string is 1m, tension in it is 40N and mass of the string is 0.1 kg. Then the velocity of transverse waves produced in the string will be:
400 ms–1
20 ms–1
180 ms–1
80 ms–1
A tube closed at one end and containing air produce fundamental note of frequency of 256 Hz. If the tube is open at both ends, the fundamental frequency will be:
384 Hz
64 Hz
128 Hz
512 Hz
In strings, the position of antinodes are obtained at
λ, 2λ,3λ
λ/4,3λ/4,5λ/4
2λ, 4, 6λ
0, λ/2,λ
When both source and listener move in the same direction with a velocity equal to half the velocity of sound, the change in frequency of the sound as detected by the listener is:
Zero
50%
25%
None of these
Which type of wave is produced in a resonance tube?
Longitudinal
Transverse stationary
Longitudinal stationary
Transverse
Radio waves of wavelength λ are sent from RADAR towards an aeroplane. If the aeroplane is moving towards the RADAR station, the wavelength of the radio waves received after reflection from the aeroplane will be
λ
< λ
> λ
More or less than λ, depending on the speed of aeroplane
For S.H.M. executed by a particle, the graph between velocity and time is given by
A
B
C
D
A particle executing S.H.M with time period of 2 sec and amplitude 5 cm. The maximum magnitude of the velocity is
10 π cm sec–1
2.5 π cm sec–1
5 π cm sec–1
20 π cm sec–1
The distance between two consecutive in phase point on S.H.M wave is
Distance between two consecutive trough
Wavelength
Distance between two consecutive crests
All above
The displacement of a body performing S.H.M is x = 0.25 (π/8) t, the amplitude of motion will be
0.25
0.125
0.2
0.3
The error in the value of speed of sound calculated by Newton at S.T.P is about
14%
15%
16%
18%
The displacement of particle in S.H.M. in one time period, if its amplitude of its motion is “A” will
be
A
2A
4A
zero
Which of the following is mechanical wave
Light waves
Sound waves
X-rays
Radio waves
The time taken by the particle to travel between a trough and crest in a transverse wave is
T
T/2
3T/4
T/4
Velocity of sound is measured in hydrogen and oxygen gases at a given temperature. The ratio of two velocities will be [VH / VO]
1 : 4
32 : 1
4 : 1
1 : 1
Newton assumed that sound propagation in a gas takes place under
Adiabatic conditions
Isothermal conditions
Isochoric condition
Isobaric condition Q
Sound waves are traveling in a medium whose adiabatic elasticity is E and isothermal elasticity E'. The velocity of sound wave is proportional to
E'
√E'
√E
E√E'
The product of angular frequency (ω) and time period T will be
1
2π
π
π/2
The displacement-time graph of a particle executing S.H.M. is shown. Which of the following statement (s) is/are true?
The acceleration is maximum at t = T
The force is zero at t =3T/4
The potential energy equals the total energy at t =T/2
All of these
A system can vibrate only if it has
Mass
Elasticity
Plasticity
Both “A” and “B”
At t=0 a body performing SHM is at mean position; when t=T/4 it will be
At t=0 a body performing SHM is at mean position; when t=T/4 it will be
at mean positionc
at extreme position
beyond extreme
A source of sound wave emits wave of frequency f. If ‘v’ is speed of sound waves. Then what will be the wavelength of the wave
v/f
vf
v-u/f
(v-u)f
The equation of displacement of a body executing SHM is x=xoCosωt , What is its initial Phase
90°
0°
180°
60°
A source of sound is moving towards a stationary observer with 1/10 of the speed of sound. The ratio of apparent to actual frequency of sound is
10/9
11/10
11/9
9/11
The graph shows the shape at a particular instant of part of a transverse wave traveling along a string
Which statement about the motion of points in the string is correct?
The speed at point P is a maximum
The displacement at point Q is always zero
The energy at point R is entirely kinetic
The acceleration at point S is a maximum
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