NCERT Class 11 Physics Oscillations

NCERT Class 11 Physics Oscillations with answers available in Pdf for free download. The NCERT Solutions for Class 11 Physics with answers have been prepared as per the latest syllabus, NCERT books and examination pattern suggested in Standard 11 by CBSE, NCERT and KVS. Solutions to questions given in NCERT book for Class 11 Physics are an important part of exams for Grade 11 Physics and if practiced properly can help you to get higher marks. Refer to more Chapter-wise Solutions for NCERT Class 11 Physics and also download more latest study material for all subjects

Oscillations Class 11 NCERT Solutions

Class 11 Physics students should refer to the following NCERT questions with answers for Oscillations in standard 11. These NCERT Solutions with answers for Grade 11 Physics will come in exams and help you to score good marks

Oscillations NCERT Solutions Class 11

NCERT Class 11 Physics Oscillations - NCERT Solutions prepared for CBSE students by the best teachers in Delhi. 

Class XI Physics

Ch. 13: Oscillations

NCERT Solutions

Question 14.1: Which of the following examples represent periodic motion?

(a) A swimmer completing one (return) trip from one bank of a river to the other and back.

(b) A freely suspended bar magnet displaced from its N-S direction and released.

(c) A hydrogen molecule rotating about its center of mass.

(d) An arrow released from a bow.


(b) and (c)

(a) The swimmer’s motion is not periodic. The motion of the swimmer between the banks of a river is back and forth. However, it does not have a definite period. This is because the time taken by the swimmer during his back and forth journey may not be the same. 

(b) The motion of a freely-suspended magnet, if displaced from its N-S direction and released, is periodic. This is because the magnet oscillates about its position with a definite period of time.

(c) When a hydrogen molecule rotates about its centre of mass, it comes to the same position again and again after an equal interval of time. Such motion is periodic.

(d) An arrow released from a bow moves only in the forward direction. It does not come backward. Hence, this motion is not a periodic.


Question 14.2: Which of the following examples represent (nearly) simple harmonic motion and which represent periodic but not simple harmonic motion?

(a) the rotation of earth about its axis.

(b) motion of an oscillating mercury column in a U-tube.

(c) motion of a ball bearing inside a smooth curved bowl, when released from a point slightly above the lower most point.

(d) general vibrations of a polyatomic molecule about its equilibrium position.


(b) and (c) are SHMs

(a) and (d) are periodic, but not SHMs

(a) During its rotation about its axis, earth comes to the same position again and again in equal intervals of time. Hence, it is a periodic motion. However, this motion is not simple harmonic. This is because earth does not have a to and fro motion about its axis.

(b) An oscillating mercury column in a U-tube is simple harmonic. This is because the mercury moves to and fro on the same path, about the fixed position, with a certain period of time. 

(c) The ball moves to and fro about the lowermost point of the bowl when released. Also, the ball comes back to its initial position in the same period of time, again and again. Hence, its motion is periodic as well as simple harmonic.

(d) A polyatomic molecule has many natural frequencies of oscillation. Its vibration is the superposition of individual simple harmonic motions of a number of different molecules. Hence, it is not simple harmonic, but periodic.


Question 14.4: Which of the following functions of time represent (a) simple harmonic, (b) periodic but not simple harmonic, and (c) non-periodic motion? Give period for each case of periodic motion (ω is any positive constant):

(a) sin ωt – cos ωt

(b) sin3 ωt

(c) 3 cos (π/4 – 2ωt)

(d) cos ωt + cos 3ωt + cos 5ωt

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Chapter 2 Units and Measurement
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Chapter 4 Motion in a Plane
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Chapter 5 Laws of Motion
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Chapter 6 Work Energy and Power
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Chapter 7 System of Particles and Rotational Motion
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Chapter 8 Gravitation
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Chapter 9 Mechanical Properties of Solids
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Chapter 10 Mechanical Properties of Fluids
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Chapter 11 Thermal Properties of Matter
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Chapter 12 Thermodynamics
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Chapter 13 Kinetic Theory
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Chapter 14 Oscillations
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Chapter 15 Waves
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