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NEET • PHYSICS • OSCILLATIONS
Oscillations practice · Mixed difficulty
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91
Medium
91 of 164
Application
+4 | -1
The amplitude of a particle executing SHM is 4 cm. At the mean position the speed of the particle is The distance of the particle from the mean position at which the speed of the particle become will be
View answer and explanation
Correct option: D
Option D (2 cm) is correct because using the formula , we can find and then solve for x when v = cm/s.
92
Easy
92 of 164
Analyzing
+4 | -1
Which of the following quantities is always negative in SHM?
Here, is displacement from mean position.
Here, is displacement from mean position.
View answer and explanation
Correct option: C
Option C () is correct because acceleration and displacement are always in opposite directions in SHM.
93
Medium
93 of 164
Understanding
+4 | -1
The circular motion of a particle with constant speed is
View answer and explanation
Correct option: D
Periodic but not simple harmonic
Option D (Periodic but not simple harmonic) is correct because while the motion repeats, the restoring force is not proportional to displacement.
94
Medium
94 of 164
Application
+4 | -1
Two particles are executing simple harmonic motion of the same amplitude A and frequency ω along the x-axis. Their mean position is separated by distance . If the maximum separation between them is , the phase difference between their motions is
View answer and explanation
Correct option: A
Option A () is correct because the phase difference leads to the given maximum separation between the two particles undergoing SHM.
95
Hard
95 of 164
Application
+4 | -1
A uniform rod of length is suspended from any point . It is then made to undergo small oscillations. If is the
View answer and explanation
Correct option: B
end point, is
Option B (end point, is ) is correct because the time period of a physical pendulum depends on the moment of inertia and the distance from the pivot point to the center of mass.
96
Medium
96 of 164
Understanding
+4 | -1
The path difference between the two waves: and will be
View answer and explanation
Correct option: C
Option C () is correct because the path difference is related to the phase difference by the formula: path difference = (wavelength / 2π) * phase difference.
97
Easy
97 of 164
Understanding
+4 | -1
Two particles are executing simple harmonic motion. At an instant of time , their displacements are and
Then, the phase difference between and is
Then, the phase difference between and is
View answer and explanation
Correct option: B
Option B () is correct because the phase difference between and is or radians.
98
Medium
98 of 164
Analyzing
+4 | -1
A simple pendulum of length 1 m is oscillating with an angular frequency 10 rad/s. The support of the pendulum starts oscillating up and down with a small angular frequency of 1 rad/s and an amplitude of . The relative change in the angular frequency of the pendulum is best given by
View answer and explanation
Correct option: C
Option C () is correct because the relative change in angular frequency is related to the amplitude and angular frequency of the support's oscillation.
99
Easy
99 of 164
Application
+4 | -1
A particle is attached to a vertical spring and is pulled down a distance below its equilibrium position and is released from rest. The initial upward acceleration of the particle is . The period of the oscillation is
View answer and explanation
Correct option: D
Option D () is correct because it is calculated using the given acceleration and displacement to find the angular frequency and then the period.
100
Hard
100 of 164
Application
+4 | -1
A block whose mass is is fastened to a spring whose spring constant is . It is pulled to a distance of from over a frictionless surface and is released at . Calculate the kinetic energy of the block when it is away from its mean position.
View answer and explanation
Correct option: B
Option B () is correct because it is the kinetic energy calculated using the conservation of energy principle for SHM.
101
Easy
101 of 164
Application
+4 | -1
The time period of oscillation of a simple pendulum of length suspended from the roof a vehicle, which moves without friction down an inclined plane of inclination , is given by:
View answer and explanation
Correct option: A
Option A () is correct because the effective gravitational acceleration is when the vehicle moves down the inclined plane.
102
Easy
102 of 164
Analyzing
+4 | -1
Statement I When a wave goes from one medium to other, average power transmitted by the wave may change.
Statement II Due to a change in the medium, amplitude, speed, wavelength and frequency of the wave may change.
Statement II Due to a change in the medium, amplitude, speed, wavelength and frequency of the wave may change.
View answer and explanation
Correct option: C
Statement I is true, Statement II is false
Option C (Statement I is true, Statement II is false) is correct because when a wave goes from one medium to another, the average power transmitted can change, but the frequency remains constant.
103
Medium
103 of 164
Understanding
+4 | -1
Which one of the following statements is true for the speed v and the acceleration a of a particle executing simple harmonic motion
View answer and explanation
Correct option: D
When v is maximum, a is zero
Option D (When v is maximum, a is zero) is correct because in SHM, the acceleration is proportional to the displacement from the mean position, and the velocity is maximum at the mean position where displacement and hence acceleration is zero.
104
Medium
104 of 164
Analyzing
+4 | -1
Assertion (A) : If the elevator goes down with constant acceleration, then frequency of oscillation of spring block system in elevator will be independent of acceleration of elevator.
Reason (R) : If the given elevator moves with uniform velocity, then the frequency of oscillation will change.
Reason (R) : If the given elevator moves with uniform velocity, then the frequency of oscillation will change.
View answer and explanation
Correct option: C
A is true, R is false
The assertion is true because the frequency of a spring-block system depends only on the spring constant and mass, not the elevator's acceleration. The reason is false because uniform velocity doesn't affect the frequency.
105
Medium
105 of 164
Analyzing
+4 | -1
Statement-I: If a pendulum clock is taken to mountain top, it gains time.
Statement-II: Value of acceleration due to gravity is less at heights.
Statement-II: Value of acceleration due to gravity is less at heights.
View answer and explanation
Correct option: D
Statement-I is false Statement-II is true
Option D (Statement-I is false & Statement-II is true) is correct because a pendulum clock loses time on a mountain top due to reduced gravity, and the value of g is indeed less at higher altitudes.
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106
Easy
106 of 164
Understanding
+4 | -1
Assertion: In simple harmonic motion, the motion is to and fro and periodic
Reason: Velocity of the particle in simple harmonic motion (where is the displacement and is spring factor).
Reason: Velocity of the particle in simple harmonic motion (where is the displacement and is spring factor).
View answer and explanation
Correct option: C
If Assertion is true but Reason is false
Option C is correct because the assertion is true (SHM is to and fro and periodic), but the reason is false. The correct velocity equation should involve the amplitude, not the spring factor.
107
Medium
107 of 164
Remembering
+4 | -1
In S.H.M. which one of the following quantities has constant ratio with acceleration:
View answer and explanation
Correct option: B
Displacement
Option B (Displacement) is correct because in SHM, acceleration is directly proportional to the negative of the displacement, making their ratio constant.
108
Hard
108 of 164
Application
+4 | -1
A uniform spring whose unstretched length is has a force constant . The spring is cut into two pieces of unstretched lengths and , where and is being an integer. Now, a mass is made to oscillate with first spring. The time period of its oscillation would be
View answer and explanation
Correct option: A
Option A, is correct because the effective spring constant for the first spring is , leading to the given time period.
109
Hard
109 of 164
Analyzing
+4 | -1
The equation of a travelling wave is where are in meter and is in second. The amplitude of oscillation of particle is:
View answer and explanation
Correct option: B
7.5 m
Option B (7.5 m) is correct because the amplitude of oscillation is half of the coefficient due to the sin2 term.
110
Medium
110 of 164
Remembering
+4 | -1
Sine and cosine functions are:
View answer and explanation
Correct option: C
Periodic functions
Option C (Periodic functions) is correct because sine and cosine functions repeat their values after a fixed interval, making them periodic.
111
Medium
111 of 164
Application
+4 | -1
The displacement of a particle in SHM various according to the relation The amplitude of the particle is
View answer and explanation
Correct option: C
Option C () is correct because the given equation can be rewritten as , so the amplitude is .
112
Medium
112 of 164
Application
+4 | -1
The angular frequency of a simple pendulum is . Now the length is made one fourth of the original length , the angular frequency becomes
View answer and explanation
Correct option: B
Option B () is correct because the angular frequency is inversely proportional to the square root of the length, so reducing the length to one-fourth doubles the angular frequency.
113
Medium
113 of 164
Understanding
+4 | -1
Displacement between maximum potential energy position and maximum kinetic energy position for a particle executing S.H.M. is
View answer and explanation
Correct option: C
Option C () is correct because the maximum potential energy position is at the extreme end () and the maximum kinetic energy position is at the mean position (0), so the displacement is .
114
Medium
114 of 164
Application
+4 | -1
The equation of SHM is given by
Where x is in cm and t is I second. The amplitude is
Where x is in cm and t is I second. The amplitude is
View answer and explanation
Correct option: C
5 cm
Option C (5 cm) is correct because the amplitude is calculated by finding the resultant of the two SHM components.
115
Hard
115 of 164
Application
+4 | -1
Two simple harmonic motion are represented by The ratio of the amplitudes of two SHM’s is
View answer and explanation
Correct option: C
Option C (2 : 1) is correct because the ratio of amplitudes is found by simplifying the first equation and comparing the amplitudes.
116
Medium
116 of 164
Understanding
+4 | -1
To show that a simple pendulum executes simple harmonic motion, it is necessary to assume that
View answer and explanation
Correct option: C
Amplitude of oscillation is small
Option C (Amplitude of oscillation is small) is correct because the approximation is valid only for small angles, which is necessary for SHM.
117
Easy
117 of 164
Application
+4 | -1
If the equation and represents SHM, then the ratio of the amplitudes of the two motions is
View answer and explanation
Correct option: B
Option B () is correct because the amplitude of the second SHM is , and the ratio of amplitudes is .
118
Medium
118 of 164
Analyzing
+4 | -1
A particle moves with simple harmonic motion in a straight line. In first sec, after starting from rest it travels a distance and in next sec, it travels , in same direction, then
View answer and explanation
Correct option: D
time period of oscillations is
Option D (time period of oscillations is ) is the correct answer. The problem describes a particle starting from rest and moving in SHM. By analyzing the distances traveled in consecutive time intervals, we can determine the time period.
119
Easy
119 of 164
Application
+4 | -1
A particle in UALM is moving with acceleration and initial velocity 20 m/s. Find time of journey if displacement is 96 m
View answer and explanation
Correct option: B
4 sec
Option B (4 sec) is correct because it is obtained by solving the quadratic equation derived from the kinematic equation of motion with constant acceleration.
120
Medium
120 of 164
Remembering
+4 | -1
is the equation of simple harmonic motion. In this equation ' ' is called
View answer and explanation
Correct option: A
phase constant
Option A (phase constant) is correct because '' in the equation represents the initial phase or phase constant.
Revision notes and key takeaways
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Showing 91-120 of 164 questions
