Question

Class 11 Physics MCQ Questions of Oscillations with Answers?

Answer 1

Students can solve these Class 11 MCQ Questions with Answers and check their preparation level.  MCQ Questions for class 11 Physics with Answers are prepared as per the newest Exam Pattern and covered whole syllabus. We have provided Class 11 Physics MCQ Questions with Answers to assist students clear the concept alright.

Students are advised to practice the MCQ Questions for class 11 Physics Oscillations with Answers is out there here. Learn given MCQ Questions for class 11 Physics Oscillations with Answers. 

Practice MCQ Questions for class 11 Physics Chapter-Wise

1. In damped oscilation the directions of the restoring force and the resistive force

(a) are the same
(b) are opposite
(c) may be same or opposite
(d) have no relation with each other

2.  If a pendulum clock is shifted from earth to the surface of moon. Then it

(a) Loses time
(b) Gains time
(c) Keeps correct time
(d) does not function

3. When a particle performing uniform circular motion of radius 10 cm undergoes the SHM, what will be its amplitude?

(a) 10 cm
(b) 5 cm
(c) 2.5 cm
(d) 20 cm

4. The length of a simple pendulum for a given time period is l. if the pendulum is taken to a place where acceleration due to gravity is doubled, the for the time period to remain the same its length should be:

(a) 2l
(b) l
(c) l/2
(d) l/4

5. Which of the following statements is not true for the oscillations of the mass suspended with a spring ?

(a) Time period varies directly as the square root of the suspended mass
(b) A stiffer spring gives lesser time period
(c) The mass cannot execute oscillations in the state of weightlessness
(d) The system will have same time period on the moon as on the earth

6. The acceleration of particle executing S.H.M. when it is at mean position is

(a) Infinite
(b) Varies
(c) Maximum
(d) Zero

7. The period of thin magnet is 4 sec. if it is divided into two equal halves then the time period of each part will be

(a) 4 sec
(b) 1 sec
(c) 2 sec
(d) 8 sec

8. If a simple harmonic oscillator has got a displacement of 0.02 m and acceleration equal to 2.0 ms^-2 at any time, the angular frequency of the oscillator is equal to

(a) 10 rad s^-1
(b) 1 rad s^-1
(c) 100 rad s^-1
(d) 1 rad s^-1

9. If a hole is bored along the diameter of the earth and a stone is dropped into the hole

(a) The stone reaches the centre of the earth and stops there
(b) The stone reaches the other side of the earth and stops there
(c) The stone executes simple harmonic motion about the centre of the earth
(d) The stone reaches the other side of the earth and escapes into space

10. In SHM, the acceleration is directly proportional to

(a) displacement
(b) time
(c) linear velocity
(d) frequency

11.The displacement of a particle in simple harmonic motion in one time period is [A = amplitude]

(a) Zero
(b) 4 A
(c) 2 A
(d) A

12. For a body executing simple harmonic motion,

(a) Acceleration of the body is always directed towards the mean position
(b) Acceleration of the body directly proportional to the displacement from the mean position
(c) The total mechanical energy is constant at any point on its path
(d) All the above

13. A system exhibiting SHM must possess

(a) elasticity as well as inertia
(b) elasticity, inertia and an external force
(c) elasticity only
(d) inertia only

14. A particle moves in a circular path with a uniform speed. Its motion is

(a) periodic
(b) oscillatory
(c) simple harmonic
(d) angular simple harmonic

15. Which of the following motions is not simple harmonic?

(a) Vertical oscillations of a spring
(b) Motion of a simple pendulum
(c) Motion of planet around the sun
(d) Oscillation of liquid in a U-tube

16. Assertion: A particle executing simple harmonic motion comes to rest at the extreme positions

Reason : The resultant force on the particle is zero at these positions

(a) Assertion is correct, reason is incorrect
(b) Assertion is incorrect, reason is correct
(c) Assertion is correct, reason is correct; reason is not a correct explanation for assertion 
(d) Assertion is correct, reason is correct; reason is a correct explanation for assertion

17. The total energy of a particle executing S.H.M. is proportional to

(a) square of amplitude of motion
(b) velocity in equilibrium position
(c) frequency of oscillation
(d) displacement from equilibrium position

18. Assertion: The graph of total energy of a particle in SHM w.r.t. position is a straight line with zero slope.

Reason: Total energy of particle in SHM remains constant throughout its motion.

(a) Assertion is correct, reason is correct; reason is a correct explanation for assertion
(b) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
(c) Assertion is correct, reason is incorrect
(d) Assertion is incorrect, reason is correct

19.   A body executes simple harmonic motion. The potential energy (P.E.), the kinetic energy (K.E.) and total energy (T.E.) are measured as a function of displacement x. Which of the following statement is true?

(a) K.E. is maximum when x = 0
(b) T.E. is zero when x = 0
(c) K.E. is maximum when x is maximum
(d) P.E. is maximum when x = 0

20. For an oscillating simple pendulum, the tension in the string is

(a) maximum at mean position
(b) constant throughout the motion
(c) cannot be predicted
(d) maximum at extreme position

21. A second's pendulum is mounted in a rocket. Its period of oscillation decreases when the rocket:

(a) Comes down with uniform acceleration
(b) constant throughout the motion
(c) Moves up with a uniform velocity
(d) Moves up with the uniform acceleration

22. A simple pendulum hanging from the ceiling of a stationary lift has a time period T₁. When the lift moves downward with constant velocity, the time period is T₂, then

(a) T₂ is infinity
(b) T₂ > T₁
(c) T₂ < T₁
(d) T₂ = T₁

23. The average velocity of a particle executing SHM in one complete vibration is:

(a) zero
(b) Aω/2
(c) Aω
(d) Aω²/2​​

24. Motion of an oscillating liquid column in a U-tube is: The average velocity of a particle executing SHM in one complete vibration is:

(a) periodic but not simple harmonic
(b) non-periodic
(c) simple harmonic and time period is independent of the density of the liquid
(d) simple harmonic and time-period is directly proportional to the density of the liquid

25. A spring-mass system oscillates with a frequency ν. If it is taken in an elevator slowly accelerating upward, the frequency will

(a) increase
(b) non-periodic
(c) remain same
(d) become zero

Answer 2

1. Answer: (c) may be same or opposite

Explanation: It is an oscillatory motion in which retarding force proportional to the amount of displacement of an object from an equilibrium position. Or in other words, the restoring force acts in the direction opposite to that of displacement of the object and is proportional to it.

2. Answer: (a) Loses time

Explanation: Time period T α \(\frac{1}{\sqrt g}\)

g on moon <g on earth. ∴ it looses time on reaching moon.

3. Answer: (a) 10 cm

Explanation: Radius = Amplitude = 10 cm.

4. Answer: (a) 2l

Explanation: The time period of a simple pendulum is,

\(T=2\pi\sqrt\frac{T}{g}\)

\(l=\frac{T^2g}{2\pi}\)

from the above equation, 

The length of the simple pendulum is directly proportional to acceleration due to gravity. If acceleration due to gravity is double then the length of the pendulum is also double. l' = 2l.

5. Answer: (c) The mass cannot execute oscillations in the state of weightlessness

Explanation: Acceleration due to gravity does not matter in the case of vibrating spring

6. Answer: (d) Zero

Explanation: A particle undergoing SHM will accelerate while it comes towards the mean position and then deaccelerate until it reaches its end points. Hence, the net acceleration is always equal to zero.

7. Answer: (c) 2 sec

Explanation: In case of vibration magnetometer when a magnet is cut n equal parts by cutting normal to its length. Then the time period of each part of magnet will be

T' = T/n.....(i) (here, T=4s,n=2)

Now, Putting the given values in Eq. (i), we get

T' = 4/2

= 2s

8. Answer: (a) 10 rad s^-1

Explanation: When a particle undergoes SHM, its acceleration is given by,

α = ω²x

Given, α = 2,x = 0.02. Using these values

ω = \(\sqrt\frac{a}{x}\)

ω = \(\sqrt\frac{2}{0.02}\)

or, ω =10 rad/s

9. Answer: (c) The stone executes simple harmonic motion about the centre of the earth

Explanation: The stone executes simple harmonic motion about the center of the earth with time period T= \(2\pi\sqrt\frac{R}{g}\) where R= Radius of earth.

10. Answer: (a) displacement

Explanation: Simple Harmonic Motion is a type of motion in which displacement is always directed towards mean position and acceleration is directly proportional to displacement and opposite in direction. acceleration is proportional to displacement and opposite in direction.

11. Answer: (a) Zero

Explanation: In one time period, the particle in SHM comes back to its original position. So the displacement will be zero. But the distance traveled will be equal to 4a.

12. Answer: (d) All the above

Explanation: For a body executing simple harmonic motion :

Acceleration of the body is always directed towards the mean position. Acceleration of the body directly proportional to the displacement from the mean position. i.e. a \(\propto\) −x and, The total mechanical energy is constant at any point on its path.

13. Answer: (a) elasticity as well as inertia

Explanation: System should be elastic and must possess inertia.

14. Answer: (a) periodic

Explanation: The motion of the particle is periodic, (not oscillatory), because it returns to its starting point after a fixed time (called time period).

15. Answer: (c) Motion of planet around the sun

Explanation: The motion of a planet around the sun is a periodic motion but not a simple harmonic motion. All other given motions are the examples of simple harmonic motion.

16. Answer: (a) Assertion is correct, reason is incorrect

Explanation: In a simple harmonic motion the magnitude of the resultant force is proportional to the displacement from the mean position. At the extreme positions, the displacement is maximum hence the magnitude of the force is also maximum.From Newton's First Law we infer that if a body remains at rest then the resultant force on it is zero but in this case, the body comes to rest momentarily and moves back towards the mean position because the force and acceleration are not zero at extreme points. 

17. Answer: (a) square of amplitude of motion

Explanation: E = 1/2 mω²a²

18. Answer: (a) Assertion is correct, reason is correct; reason is a correct explanation for assertion

Explanation: The total energy of S.H.M. = Kinetic energy of particle +potential energy of particle.

19. Answer: (a) K.E. is maximum when x = 0

Explanation: In S.H.M., at mean position i.e. at x=0 kinetic energy will be maximum and pE will be minimum. Total energy is always constant.

20. Answer: (a) maximum at mean position

Explanation:  For an oscillating simple pendulum, the tension in the string is maximum at the mean position and minimum at the extreme position.

21. Answer: (d) Moves up with the uniform acceleration

Explanation: Period of oscillation \(T=2\pi\sqrt\frac{l}{g}\). Therefore T will decrease when acceleration (g) increases. And g will increase when the rocket moves up with a uniform acceleration.

22. Answer: (d) T₂ = T₁

Explanation: The lift is moving with constant velocity so, there will be no change in the acceleration hence time period will remain same.

23. Answer: (a) zero

Explanation: In one complete vibration, displacement is zero. So, average velocity in one complete vibration.

24. Answer: (c) simple harmonic and time period is independent of the density of the liquid

Explanation: Motion of an oscillating liquid column in a U tube is SHM with period, 

25. Answer: (c) remain same

Explanation: The time period of a spring-mass system is given by T=2π√(m/k) Since this expression is not dependent on the acceleration due to the gravity, the time period T and hence the frequency (since ν=1/T) remains the same.

Click here to practice MCQ Questions for Oscillations class 11