Welcome to the **11th Class Physics Chapter 07 MCQs Online**** Test**. We are presenting you with top MCQ questions from the **11th Class Physics Chapter Oscillations**.

## 11th Class Physics Chapter 07 MCQs with Answers

The 11th Class Physics Chapter “Oscillations” explores the fundamental concepts of periodic motion and oscillatory behavior in physical systems. This chapter focuses on understanding the principles of oscillations, their mathematical representation, and the factors that influence them.

The chapter begins by introducing the concept of oscillations and their characteristics. Students will learn that oscillations are repetitive motions around an equilibrium position and occur in various systems, including mechanical, electrical, and acoustic systems. They will understand the importance of restoring forces in driving oscillatory motion.

Students will delve into the principles of simple harmonic motion (SHM). They will learn about the characteristics of SHM, including the relationship between displacement, velocity, and acceleration in an oscillating system. They will also explore the concept of equilibrium position, amplitude, frequency, and period of oscillations.

The chapter further explores the mathematical representation of oscillatory motion. Students will learn about the equations that describe SHM, such as x = A cos(ωt) and v = -Aω sin(ωt), where x represents displacement, A represents amplitude, ω represents angular frequency, t represents time, and v represents velocity. They will understand the relationship between the angular frequency and the period of oscillation.

Moreover, students will study the factors that influence oscillatory motion. They will learn about the role of mass, stiffness, and damping in affecting the characteristics of oscillations. Students will explore the concept of resonance and its importance in amplifying oscillations in certain systems.

The chapter may also cover topics such as the pendulum, spring-mass systems, and other examples of oscillatory motion. Students will understand the principles and mathematical representations specific to these systems and learn how to analyze and solve problems related to oscillations.

To enhance understanding, the chapter may include practical examples, diagrams, and problem-solving exercises. Students will develop skills in analyzing and calculating quantities related to oscillatory motion, applying the principles of SHM, and solving problems related to oscillation scenarios.

Studying “Oscillations” in the 11th Class Physics curriculum provides students with a solid foundation in understanding the principles and applications of periodic motion. It prepares them for further studies in vibrations, wave mechanics, and related fields. Additionally, it cultivates critical thinking skills, mathematical reasoning, and an appreciation for the presence of oscillatory behavior in various natural and man-made systems.

**What are ****Oscillations****?**

An oscillation can be **a periodic motion that repeats itself in a regular cycle**, such as a sine wave—a wave with perpetual motion as in the side-to-side swing of a pendulum, or the up-and-down motion of spring with a weight. An oscillating movement occurs around an equilibrium point or means value.

**Chapter 7 ****Oscillations**

**1. What will be to and fro motion of a body about its mean position called to choose which one is correct:**

(a) Linear motion

(b) Rotatory motion

(c) Angular motion

**(d) Vibratory motion**

**2. Which is motion which repeats itself in equal intervals of time choose which one is correct:**

(a) Rotatory motion

**(b) Periodic motion**

(c) Oscillatory motion

(d) Translatory motion

**3. In SHM, the acceleration of a body is directly proportional to choose which one is correct:**

**(a) Applied force**

(b) Displacement

(c) Restoring force

(d) Amplitude

**4. The law which derived in SHM by choose which one is correct:**

**(a) Hook’s law**

(b) Ampere’s law

(c) Dalton’s law

(d) Newton ‘s law

**5. The wave form of SHM is choose which one is correct:**

(a) Square wave

**(b) Sine wave**

(c) Cosine wave

(d) None of these

**6. The maximum distance of the vibrating body from the mean position is called choose which one is correct:**

(a) Displacement

(b) Time period

(c) Frequency

**(d) Amplitude**

**7. The no of vibrations completed in 1 second is known choose which one is correct:**

(a) Amplitude

**(b) Frequency**

(c) Time period

(d) Revolution

**8, The relation between time period and frequency is choose which one is correct:**

(a) f = 2

(b) f =

(c) f =

**(d) f =**

**9 The time taken to complete one revolution is called choose which one is correct:**

(a) Frequency

**(b) Time period**

(c) Time

(d) Displacement

**10. A force 20 N is applied on an elastic spring. If the extension produced in the spring is 10 cm, then what spring constant k will be choose which one is correct:**

(a) 20 N/m

(b) 40 N/m

(c) 10 N/m

**(d) 200 N/m**

**Il. An example of SHM is choose which one is correct:**

(a) Motion of earth around the sun

**(b) Motion of simple pendulum**

(c) Motion of cricket ball

(d) None of these

**12. A body attached to a spring is pulled to a distance of 20 cm. If the spring constant k is 48 N/m then find the force applied choose which one is correct:**

(a) 5.3 N

**(b) 9.6N**

(c) 96 N

(d) 192 N

**13. The main cause of an oscillatory motion of an elastic spring is choose which one is correct:**

(a) Mass of the spring

(b) Weight of spring

(c) K.E of the spring

**(d) Restoring force of the spring**

**14. The restoring force is directly proportional to the displacement within elastic limit, this is the statement of choose which one is correct:**

**(a) Hook’s law**

(b) Newton’s law

(c) Meld’s law

(d) Youngs law

**15. The unit of frequency is choose which one is correct:**

(a) m/s

**(b) Hz**

(c) N/m

(d) None of these

**16. A particle performing SHM has displacement equal to choose which one is correct:**

**(a) x _{o} sin**

(b) x_{o} cos

(c) X_{0} cos^{2}

(d) x_{o} sin^{2}

**17. Instantaneous acceleration of a system executing SHM is directed choose which one is correct:**

**(a) Towards the mean position**

(b) Away from the mean position

(c) Perpendicular to the mean position upward

(d) Perpendicular to the mean position downward

**18. The angular speed of mass attached with spring is choose which one is correct:**

(a)

**(b)**

(c)

(d)

**19. A simple pendulum is oscillating in a lift. When the lift starts moving upwards with a uniform acceleration, what effect will be on period choose which one is correct:**

**(a) remains unaffected**

(b) be shorter

(c) be longer

(d) may be shorter or longer depending on the magnitude of acceleration

**20. The velocity of a body in SHM is maximum at the choose which one is correct:**

(a) Extreme position

(b) Between mean and extreme position

**(c) Mean position**

(d) Between extreme and mean

**21. The velocity of the body is minimum at the choose which one is correct:**

(a) Mean position

**(b) Extreme position**

(c) Between mean and extreme position

(d) None of the above

**22. The acceleration of projection of a point P on the diameter moving on a circle is choose which one is correct:**

**(a) – ^{2}x**

(b) x^{2}

(c) -x^{2}

(d) ^{2}x

**23. The time period of simple pendulum depends upon choose which one is correct:**

(a) Thickness of the thread

(b) Mass of the pendulum

**(c) Length of the pendulum**

(d) Amplitude

**24. The time period of simple pendulum is choose which one is correct:**

(a) 1 second

(b) 1.5 second

**(c) 2 second**

(d) None of these

**25. The phase angle **~~0~~** = t of a body performing SHM indicates choose which one is correct:**

(a) Only the magnitude of displacement

(b) Only the direction of the displacement

**(c) Both magnitude and direction**

(d) None of these

**26. A body performing SHM has a displacement X given by the equation X = 30 sin 50 t, what is the frequency of oscillation choose which one is correct:**

(a) 0.020 Hz

(b) 0.13 Hz

**(c) 8.0 Hz**

(d) 50 Hz

**27. In vibratory motion choose which one is correct:**

(a) P.E remains constant

(b) K.E remains constant

**(c) Total energy remains constant**

(d) None of these

**28. When a particle is moving along a circular path, its projection along the diameter executes choose which one is correct:**

**(a) S.H.M**

(b) Angular motion

(c) Linear motion

(d) Rotatory motion

**29. The maximum velocity of I kg mass attached to a spring constant of I Nm upto the displacement of 5 cm is choose which one is correct:**

(a) 1 ms^{-1}

(b) 0.01 ms_{-1}

(c) 5 ms^{-1}

**(d) 0.05 ms ^{-1}**

**30. A body of mass 5 kg in executing S.H.M with amplitude 10 cm. Its maximum velocity is 100 cms- . Its velocity will be 50 cms-l at a displacement from the mean position equal to choose which one is correct:**

(a) 5 cm

**(b) 5cm**

(c) 10 cm

(d) 10 cm

**31. The maximum velocity V**_{o}** of the mass attached to the end of an elastic spring is choose which one is correct:**

(a) v_{0 }= x_{0}

(b) v_{0 }= x

(c) v_{0 }= x.

**(d) v _{0 }= x_{0}**

**32. The total energy of a body executing S.H.M is directly proportional to choose which one is correct:**

(a) The amplitude

**(b) Square of amplitude**

(c) Square root of amplitude

(d) None of these

**33. The total energy of a mass attached with spring is choose which one is correct:**

**(a) Remain constant**

(b) Increased

(c) Decreased

(d) None of these

**34. The force which is responsible for the motion of simple pendulum is choose which one is correct:**

**(a) -mg sin 0**

(b) -mg cos ~~0~~

(c) mg

(d) mg tan ~~0~~

**35. The time period of simple pendulum is given as choose which one is correct:**

(a) T = 2

**(b) T = 2**

(c) T =

(d) T =

**36. The time period of a simple pendulum will be directly proportional to the choose which one is correct:**

(a)

**(b)**

(c)

(d)

**37. If the mass of the bob of simple pendulum is doubled, its time period is choose which one is correct:**

(a) One half

(b) Double

**(c) Remains constant**

(d) One fourth

**38. The time period of a simple pendulum is independent of its choose which one is correct:**

**(a) Mass**

(b) Length

(c) Acceleration due to gravity

(d) Restoring force

**39. The frequency of the second pendulum is choose which one is correct:**

**(a) 0.5 Hz**

(b) 15 Hz

(c) 2 Hz

(d) 1 Hz

**40. The frequency of second pendulum is given by choose which one is correct:**

**(a)**

(b)

(c)

(d) None of these

**41. q The length of second’s pendulum is choose which one is correct:**

**(a) 0.99 m**

(b) 0 6 m

(c) 3 m

(d) 2 m

**42. When the bob of simple pendulum is at extreme position, it has choose which one is correct:**

**(a) Potential energy**

(b) Kinetic energy

(c) Both P.E and K.E

(d) None of these

**43. When the bob of simple pendulum is at mean position then which energy it has choose which one is correct:**

(a) Potential energy

**(b) Kinetic energy**

(c) Both P.E and K.E

(d) None of these

**44. Total energy of a particle executing SHM at any displacement X is given by choose which one is correct:**

(a) T.E = kx

**(b) T.E = kx _{0}^{2}**

(c) T.E = kx_{0}

(d) T.E = kx^{2}

**45. At the centre of the earth, the simple pendulum will choose which one is correct:**

**(a) Vibrate with double time period**

(b) Vibrate with halftime period

(c) Not move

(d) None of these

**46. The value of g is calculated from choose which one is correct:**

(a)

(b)

(c)

**(d)**

**47. The length of simple pendulum is calculated from the expression choose which one is correct:**

(a)

**(b)**

(c)

(d)

**48. The acceleration of the body having SHM depends upon its choose which one is correct:**

(a) Velocity

(b) Mass

**(c) Displacement from mean position**

(d) None of these

**49. The time period of a simple pendulum depends upon choose which one is correct:**

(a) Mass of bob

**(b) Length of thread**

(c) Height of bob

(d) None of these

**50. The time period of second’s pendulum is choose which one is correct:**

(a) 4 seconds

(b) 1 seconds

(c) 3 seconds

**(d) 2 seconds**

**51. The time period of the mass attached with spring executing S.H.M is choose which one is correct:**

**(a)**

(b)

(c)

(d) None of these

**52. A heating and cooking of food evenly by Microwave oven is an example of choose which one is correct:**

(a) S.H.M

(b) Damped oscillations

(c) Resonance

(d) None of these

**53. The angular velocity and angular frequency is related by the relation choose which one is correct:**

**(a)**

(b)

(c)

(d)

**54. Work done during horizontal mass spring system by the average force is choose which one is correct:**

(a)

**(b)**

(c)

(d)

**55. The direction of both acceleration and restoring force in SHM is choose which one is correct:**

(a) Same direction

**(b) Opposite direction**

(c) Perpendicular to each other

(d) None of these

**56. If an oscillating body is subjected to an external force then it is said to be executing choose which one is correct:**

(a) Free oscillations

**(b) Forced oscillations**

(c) Mixed oscillations

(d) Damping

**57. If a body vibrates with its natural frequency without the effect of an external force then it is said to be choose which one is correct:**

**(a) Free oscillations**

(b) Forced oscillations

(c) Mixed oscillations

(d) Oscillations

**58. Loud music produced by sounding wooden boards of strings instruments is an example of choose which one is correct:**

(a) Free oscillations

**(b) Beats**

(c) Forced oscillations

(d) Damped oscillations

**59. When damping is small, the amplitude of vibration in resonance will be choose which one is correct:**

(a) Unchanged

**(b) Large**

(c) Small

(d) None of these

**60. How long must be the length of a simple pendulum in order to have a period of one second choose which one is correct:**

(a) 0.50 m

**(b) 0.25 m**

(c) 1 m

(d) 3 m

**61. Shock absorber in automobiles is a practical form of choose which one is correct:**

(a) SHM

**(b) Damped oscillations**

(c) Pascal’s law

(d) None of these

**62. Damping effect applied on an aeroplane wing is choose which one is correct:**

(a) For more speed

(b) To push upward

**(c) To overcome resonance effect**

(d) To overcome gravity

**63. The amplitude of the lead ball is much greater than that of the choose which one is correct:**

(a) Pitch ball

**(b) Iron ball**

(c) Plastic ball

(d) None of these

**64. When potential energy of the mass is maximum, the kinetic energy of the spring is choose which one is correct:**

(a) Zero

(b) Maximum

**(c) Minimum**

(d) None of these

**65. If the position of oscillating object is given by the equation X = cos then its displacement after 2 second is choose which one is correct:**

(a) 3 m

(b) 2 m

**(c) 1 m**

(d) 0 m

**66. The projection of a particle moving along a circular path executes choose which one is correct:**

(a) Simple motion

(b) Angular motion

(c) Translatory motion

**(d) S.H.M**

**67. In simple harmonic motion, the acceleration is always directed choose which one is correct:**

**(a) Towards its mean position**

(b) Away from mean position

(c) Along the tangent

(d) None of these

**68. In oscillating motion choose which one is correct:**

(a) P.E remains constant

(b) K.E remains constant

**(c) Total energy remains constant**

(d) None of these

**69. The body oscillates due to choose which one is correct:**

(a) Gravitational force

(b) Frictional force

**(c) Restoring force**

(d) Deforming force

**70. The oscillatory motion which does not repeat after regular interval of time is called choose which one is correct:**

(a) Periodic motion

(b) Circular motion

**(c) Non-periodic motion**

(d) Orbital motion

71. Acceleration of spring mass system is choose which one is correct:

(a) Uniform

**(b) Variable due to both change in magnitude and direction**

(c) Variation due to change in direction

(d) Variation due to change in magnitude

**72. In an isolated spring mass system, total energy is choose which one is correct:**

(a) Variable

**(b) Constant**

(c) Low

(d) High

**73. The formula T = of a simple pendulum holds only if choose which one is correct:**

**(a) Amplitude of the motion should be small**

(b) Length of pendulum is small

(c) Length of pendulum is large

(d) Mass of pendulum is small

**74. Potential energy of spring mass system is stored in choose which one is correct:**

**(a) Spring**

(b) Mass

(c) Length

(d) None of these

**75. A quantity which indicates the state and direction of motion of a vibrating body is known as choose which one is correct:**

(a) Amplitude

(b) Displacement

**(c) Phase angle**

(d) Time period

**76. In microwave oven, heating is produced by phenomenon of choose which one is correct:**

(a) Harmonic vibration

(b) Forced vibration

(c) Free vibration

**(d) Resonance**

**77. The frequency of waves produced in microwave oven is choose which one is correct:**

**(a) 2450 MHz**

(b) 1435 MHz

(c) 1760 MHz

(d) 2550 MHz

**78. The wavelength of the waves produced in microwave oven is choose which one is correct:**

(a) 8 cm

(b) 10 cm

(c) 14 cm

**(d) 12 cm**

**79. The sharpness of the resonance curve depends on choose which one is correct:**

(a) Loss of energy

(b) Loss of potential energy

(c) Loss of kinetic energy

**(d) Frictional loss of energy**

**80. The amplitude of a vibrating body at resonance in vacuum is choose which one is correct:**

(a) Maximum

**(b) Infinite**

(c) Minimum

(d) None of these

**81. If F = 0.4 N and x = 2 cm then k =**

(a) 10 N/m

**(b) 20 N/m**

(c) 3 N/n

(d) 30 N/n

**82. At what place motion of simple pendulum will be slowest at choose which one is correct:**

(a) Equator

(b) Poles

(c) On the surface of earth

**(d) At the centre of the earth**

**83. If mass attached to spring increases, then its time period choose which one is correct:**

**(a) Increases**

(b) Decreases

(c) No change

(d) None of these

**84. Frequency of a vibratory motion is choose which one is correct:**

(a) Less than time period

(b) Equal to time period

**(c) Reciprocal of time period**

(d) None of these

**85. At which of the following places motion of a simple pendulum is fastest choose which one is correct:**

**(a) Karachi**

(b) Rehim Yar Kan

(c) Lahore

(d) Islamabad

**86. A cheap pendulum clock will choose which one is correct:**

**(a) Lose time in summer and gain time in winter**

(b) Gain time in summer and lose time in winter

(c) Keep correct time

(d) None of these

**87. A simple pendulum is vibrating in an evacuation chamber it will choose which one is correct:**

**(a) Oscillate forever with the same amplitude frequency**

(b) Come to rest eventually

(c) Oscillate with same amplitude with frequency decreasing with time

(d) None of these

**88. Total energy of a particle performing S.H.M. is directly proportional to choose which one is correct:**

(a) Square root of the amplitude

(b) Amplitude

(c) Reciprocal of amplitude

**(d) Square of amplitude**

**89. When the mass and speed of a body are doubled, the K.E will becomes choose **which one is correct:

(a) 5 times

(b) 4 times

**(c) 8 times**

(d) 16 times

**90. Solar cells are made up from the material called choose which one is correct:**

(a) Iron

(b) Oxygen

(c) Carbon

**(d) Silicon**

**91. At present, the hydroelectric generating capacity in Pakistan amounts to about choose which one is correct:**

(a) 4000 mega watt

**(b) 3000 mega watt**

(c) 5000 mega watt

(d) None of these

**92. The consumption of energy by a 60 watt bulb in 2s in choose which one is correct:**

**(a) 120 J**

(b) 100 J

(c) 90J

(d) 0.02 J

**93. In SHM, the restoring force is directly proportionate to choose which one is correct:**

(a) Velocity

(b) Acceleration

**(c) Displacement**

(d) Time period

**94. A student made a simple pendulum of time period I sec. The string used is of length I m, in order to make a simple pendulum of time period 2 sec, he should be the length of string.**

(a) 2 m.

(b) 3 m.

**(c) 4 m.**

(d) 4 sec.

**95. Time period of second pendulum at moon is choose which one is correct:**

(a) 1 sec.

**(b) 2 sec.**

(c) 3 sec.

(d) 4 sec.

**96. If the period of oscillation of mass M suspended from a spring is I sec., then what will be the period of mass 4 M choose which one is correct:**

(a) sec.

(b) sec.

**(c) 2 sec.**

(d) 4 sec.

**97. A girl is swinging on a swing in the sitting position. How will it affects the period of swing if she stands up choose which one is correct?**

**(a) The period will now be shorter**

(b) The period will now be longer

(c) The period will remain unchanged

(d) The period may become longer or shorter depending upon the height of girl

**98. A simple harmonic oscillator has time period T. what time will taken by it to travel from the extreme position to half the amplitude is choose which one is correct:**

(a)

(b)

**(c)**

(d)

**99. The frequency of oscillation of a simple pendulum of length L mounted in a cabin that is falling freely under gravity is choose which one is correct:**

(a) Infinity

**(b) Zero**

(c) one

(d) none

**100. A particle executes S.H.M with frequency ‘f’ the frequency with which its K.E oscillates is choose which one is correct:**

(a) f

**(b) 2f**

(c) 3f

(d) 4f