# MCQs For NCERT Class 11 Physics Chapter 14 Oscillations

Please refer to the MCQ Questions for Class 11 Physics Chapter 14 Oscillations with Answers. The following Oscillations Class 11 Physics MCQ Questions have been designed based on the latest syllabus and examination pattern for Class 11. Our experts have designed MCQ Questions for Class 11 Physics with Answers for all chapters in your NCERT Class 11 Physics book.

## Oscillations Class 11 MCQ Questions with Answers

See below Oscillations Class 11 Physics MCQ Questions, solve the questions and compare your answers with the solutions provided below.

Question. A particle executes simple harmonic motion between x = – A and x = + A. The time taken for it to go from O to A/2 is T1 and T1 and to go from A/2 to A is T2. Then
(a) T1 < T2
(b) T1 > T2
(c) T1 = T2
(d) T1 = 2T2

A

Question. For an oscillating simple pendulum, the tension in the string is
(a) maximum at extreme position
(b) maximum at mean position
(c) constant throughout the motion
(d) cannot be predicted

B

Question. A simple pendulum is set into vibrations. The bob of the pendulum comes to rest after some time due to
(a) Air friction
(b) Moment of inertia
(c) Weight of the bob
(d) Combination of all the above

A

Question. The ratio of energies of oscillations of two exactly identical pendulums oscillating with amplitudes 5 cm and 10 cm is : (a) 1 : 2 (b) 2 : 1 (c) 1 : 4 (d) 4 : 1 61. A child swinging on wing in sitting position stands up. The time period of the swing will
(a) increase
(b) decrease
(c) remain same
(d) increase if the child is tall and decrease if the child is short.

C

Question. A spring-mass system oscillates with a frequency n. If it istaken in an elevator slowly accelerating upward, the frequency will
(a) increase
(b) decrease
(c) remain same
(d) become zero

C

Question. Select the correct statement(s) from the following
I. Motion of a satellite and a planet is periodic as well as SHM.
II. Mass suspended by a spring executes SHM.
III. Motion of a simple pendulum is always SHM.
(a) I only
(b) II only
(c) I and II
(d) I, II and III

B

Question. A simple spring has length l and force constant K. It is cut into two springs of lengths l1 and l2 such that l1 = n l2 (n = an integer). The force constant of spring of length l1 is
(a) K (1 + n)
(b) (K/n) (1 + n)
(c) K
(d) K/(n + 1)

B

Question. A coin is placed on a horizontal platform which undergoes vertical simple harmonic motion of angular frequency w. The amplitude of oscillation is gradually increased. The coin will leave  contact with the platform for the first time
(a) at the mean position of the platform
(b) for an amplitude of g/ω2
(c) for an amplitude of g2/ω2
(d) at the highest position of the platform

B

Question. The function sin2 (wt) represents
(a) a periodic, but not simple harmonic motion with a period π/ω
(b) a periodic, but not simple harmonic motion with a period 2π/ω
(c) a simple harmonic motion with a period π/ω
(d) a simple harmonic motion with a period 2π/ω

A

Question. A particle of mass is executing oscillations about the origin on the x-axis. Its potential energy is V(x) = k | x |3, where k is a positive constant. If the amplitude of oscillation is a, then its time period T is
(a) proportional to 1/√a
(b) proportional to √a
(c) independent a3/2
(d) none of these

A

Question. If the time period of oscillation of mass m suspended from a spring is 2 sec, the time period of mass 4 m will be :
(a) 2 sec
(b) 3 sec
(c) 4 sec
(d) T sec

C

Question. If a simple pendulum oscillates with an amplitude of 50 mm and time period of 2 sec then its  maximum velocity is
(a) 0.6 m/s
(b) 0.16 m/s
(c) 0.8 m/s
(d) 0.32 m/s

B

Question. A horizontal platform with an object placed on it is executing simple harmonic motion in the vertical direction. The amplitude of oscillation is 3.92 × 10–3 m. What should be the least period of these oscillations, so that the object is not detached from the platform ?
(a) 0.145 sec
(b) 0.1556 sec
(c) 0.1256 sec
(d) 0.1356 sec

C

Question. A pendulum is undergoing S.H.M. The velocity of the bob in the mean position is v. If now its amplitude is doubled, keeping the length same, its velocity in the mean position will be
(a) v/2
(b) v
(c) 2 v
(d) 4 v

A

Question. The bob of a simple pendulum of mass m and total energy E will have maximum linear momentum equal to
(a) √2E m
(b) √2mE
(c) 2mE
(d) mE2

B

Question. Choose the correct statement
(a) Time period of a simple pendulum depends on amplitude.
(b) Time shown by a spring watch varies with acceleration due to gravity g.
(c) In a simple pendulum time period varies linearly with the length of the pendulum.
(d) The graph between length of the pendulum and time period is a parabola

D

Question. A particle executing simple harmonic motion covers a distance equal to half of its amplitude in one second. Then the time period of the simple harmonic motion is
(a) 4 s
(b) 6 s
(c) 8 s
(d) 12 s

D

Question. The maximum velocity of a particle, executing simple harmonic motion with an amplitude 7 mm, is 4.4 m/s. The period of oscillation is
(a) 0.01 s
(b) 10 s
(c) 0.1 s
(d) 100 s

A

Question. A body is executing S.H.M. When its displacement from the mean position are 4 cm and 5 cm, it has velocities 10 cm s–1 and 8 cm s–1 respectively. Its periodic time is
(a) p/2 s
(b) p s
(c) 3 p/2 s
(d) 2 p s

B

Question. Two oscillating simple pendulums with time periods T and 5T 4 are in phase at a given time. They are again in phase after an elapse of time
(a) 4T
(b) 3T
(c) 6T
(d) 5T

D

Question. The length of a simple pendulum executing simple harmonic motion is increased by 21%. The percentage increase in the time period of the pendulum of increased length is
(a) 11%
(b) 21%
(c) 42%
(d) 10%

D

Question. A simple harmonic wave having an amplitude a and time period T is represented by the equation y = 5sinp (t + 4)m . Then the value of amplitude (a) in (m) and time period (T) in second are
(a) a = 10, T = 2
(b) a = 5, T = 1
(c) a = 10, T = 1
(d) a = 5, T = 2

D

Question. The height of liquid column in a U tube is 0.3 m. If the liquid in one of the limbs is depressed and then released, then the time period of the liquid column will be
(a) 1.1 sec
(b) 19 sec
(c) 0.11 sec
(d) 2 sec

A

Question. On earth, a body suspended on a spring of negligible mass causes extension L and undergoes oscillations along length of the spring with frequency f. On the Moon, the same quantities are L/n and f ‘ respectively. The ratio f ‘/f is
(a) n
(b) n 1
(c) n–1/2
(d) 1

D

Question. A second’s pendulum is placed in a space laboratory orbiting around the earth at a height 3 R from the earth’s surface where R is earth’s radius. The time period of the pendulum will be
(a) zero
(b) 2 3
(c) 4 sec
(d) infinite

D

Question. A spring is vibrating with frequency under same mass. If it is cut into two equal pieces and same mass is suspended then the new frequency will be:
(a) n 2
(b) n/√2
(c) n/2
(d) n

A

Question. Simple pendulum is executing simple harmonic motion with time period T. If the length of the pendulum is increased by 21 %, then the increase in the time period of the pendulum of the increased length is :
(a) 22 %
(b) 13 %
(c) 50 %
(d) 10 %

D

Question. Which of the following functions represents a simple harmonic oscillation ?
(a) sin wt – cos wt
(b) sin 2 wt
(c) sin wt + sin 2wt
(d) sin wt – sin 2wt

A

Question. Resonance is an example of
(a) tuning fork
(b) forced vibration
(c) free vibration
(d) damped vibration

B

Question. Two particles are executing S.H.M. of same amplitude and frequency along the same straight line path. They pass each other when going in opposite directions, each time their displacement is half of their amplitude. What is the phase difference between them ?
(a) 5 p/6
(b) 2 p/3
(c) p/3
(d) p/6

B

Question. The period of oscillation of a mass M suspended from a spring of negligible mass is T. If along with it another mass M is also suspended, the period of oscillation will now be
(a) T
(b) T /√2
(c) 2T
(d) √2 T

D

Question. The bob of a simple pendulum executes simple harmonic motion in water with a period t, while the period of oscillation of the bob is t0 in air. Neglecting frictional force of water and given that the density of the bob is (4/3) × 1000 kg / m3. What relationship between t and t0 is true
(a) t = 2t0
(b) t = t0 / 2
(c) t = t0
(d) t = 4t0

A

Question. A wall clock uses a vertical spring-mass system to measure the time. Each time the mass reaches an extreme position, the clock advances by a second. The clock gives correct time t the equator. If the clock is taken to the poles it will
(a) run slow
(b) run fast
(c) stop working
(d) give correct time

D

Question. If the metal bob of a simple pendulum is replaced by a wodden bob, then its time period will be :
(a) decreased
(b) the same
(c) increased
(d) first (c) then (a)