Physics Oscillations MCQs Chapter 7 Class 11

Created on February 07, 2022 By Ali Durrani

Physics Ch 7 Class 11 Oscillations and Simple Harmonic Motion

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1 / 87

If the length of pendulum is increased 4 times, the new time period will be?

2T

3T

4T

5T

2 / 87

According to the hook’s law, strain is directly proportional to stress

True

False

None of these

May or may not

3 / 87

Beats can be used to find:

PMC Practice 1
Physics
Oscillations and Simple Harmonic Motion
Elimination Tool:

A) Speed

B) Frequency

C) Amplitude

D) Wavelength

4 / 87

A spring of force constant 800 N/m has an extension of 5 cm, the work done in extending it from 5 cm to 15 cm

PMC Sample 3
Physics
Oscillations and Simple Harmonic Motion
Elimination Tool:

A) 16 J

B) 8 J

C) 32 J

D) 24 J

5 / 87

Equation of SHM, with amplitude ‘a’ is given by:

NUMS 2015
Physics
Oscillations and Simple Harmonic Motion
Elimination Tool:

A) X = a(sin2ω t + cos2ω t)

B) X = a(sin ω t cos2ω t)

C) X = a sin ω t

D) X = a2sin (sin ω t)

6 / 87

If the value of g is made g/16, what will be the effect on time period of pendulum?

Doubled

Four times

Halved

One fourth

7 / 87

If a pendulum is oscillating with a frequency f then what is the frequency at which it’s K.E. changes?

NUMS 2019 Cancelled
Physics
Oscillations and Simple Harmonic Motion
Elimination Tool:

A) 2f

B) f/2

C) F

D) None of these

8 / 87

When the frequency of the applied force becomes equal to one of natural frequencies of body then the body oscillates with maximum displacement this phenomenon is called:

UHS 2018
Physics
Wave Motion and Sound
Oscillations and Simple Harmonic Motion
Elimination Tool:

A) Heating

B) Resonance

C) Reverbnation

D) Damping

9 / 87

The frequency of a string on a musical instrument can be changed either by:

PMC Sample 3
Physics
Oscillations and Simple Harmonic Motion
Elimination Tool:

A) varying the diameter or by changing the length

B) varying the tension or by changing the thickness

C) varying the tension or by changing the length

D) varying the thickness or by changing the length

10 / 87

In S.H.M the K.E. at the equilibrium position is:

NUMS 2018
Physics
Oscillations and Simple Harmonic Motion
Elimination Tool:

A) Zero as the acceleration is zero

B) Minimum as the instantaneous displacement is zero

D) Maximum as the velocity is maximum

C) Minimum as the instantaneous displacement is zero

11 / 87

Which of the following Is true for a wave entering a denser medium?

Reflected away from normal

Refracted towards normal

Reflected towards normal

Refracted away from normal

12 / 87

A wire has a spring constant of 5 x 104 N m-1. It is stretched by a force to extension of 1.4 mm. Calculate the strain energy stored in the wire.

UHS 2019
Physics
Oscillations and Simple Harmonic Motion
Elimination Tool:

A) 4.9 x 10-5 J

B) 4.9 x 10-2 J

C) 4.9 J

D) 4.9 x 10-3 J

13 / 87

On increasing the spring constant to 4 times its value:

Frequency of mass spring system doubles

Time period of mass spring system doubles

Both time period & frequency gets double

None of these

14 / 87

The force applied on unit area to produce any change in the volume or length of a body is called:

NUMS 2017
Physics
Oscillations and Simple Harmonic Motion
Elimination Tool:

A) Strain

B) Stress

C) Elasticity

D) Equilibrium

15 / 87

If a pipe is closed at one end and open at the other, the closed end is a:

PMC Sample 3
Physics
Oscillations and Simple Harmonic Motion
Elimination Tool:

A) antinode

B) node

C) rarefaction

D) crest

16 / 87

General Equation of SHM is given as: x(t) = A sin(wt) Find approximate value of wt, if x(t) = 71cm and A=100cm.

30 degrees

45 degrees

60 degrees

90 degrees

17 / 87

If length of simple pendulum is increased four times what will be effect on its frequency?

Half

Double

No effect

None of these

18 / 87

An object is undergoing simple harmonic motion. It’s time period is T and total energy is E. The amplitude of vibration is reduced to half. What is the new time period and total energy of the system?

PMC Practice 5
Physics
Oscillations and Simple Harmonic Motion
Elimination Tool:

A) Time period = T/2 total energy = E/4

B) Time period = no change total energy = E/4

C) Time period= T/2 total energy = E/2

D) Time period= T total energy= E/2

19 / 87

If the length of simple pendulum is increased to 6 time; and g reduces to 3 times, then time period will be?

Increased by √18 times

Increased by √16 times

Decreased by √18 time

Decreased by √16 times

20 / 87

The oscillating object overshoots the rest position due to:

PMC Sample 1
Physics
Oscillations and Simple Harmonic Motion
Elimination Tool:

A) restoring force

B) inertia

C) gravitational potential energy

D) elastic potential energy

21 / 87

The motion of particle executing SUM is given by x = 0.01 sin 100 π t, where x is in meter and time is in second. The time period is

0.2

0.1

0.02

0.01

22 / 87

What is the kinetic energy at the extreme position during SHM?

Zero

Maximum

Minimum

Constant

23 / 87

In SHM is conserved

K.E

P.E

Total Energy

All of these

24 / 87

If the time period of the oscillation is 20 micro-sec, then what will be the frequency of that oscillating body?

UHS 2018
Physics
Oscillations and Simple Harmonic Motion
Wave Motion and Sound
Elimination Tool:

A) 5000 Hz

B) 50000 Hz

C) 20000 Hz

D) 1000 Hz

25 / 87

If T is to be reduced to T/3 then length of pendulum should be: a) L/9 b) In c) l./3 d) L/4

L/9

L/2

L/3

L/4

26 / 87

Transvers waves can transfer their energy on, In

Solids

Liquids

Gases

All of these

27 / 87

A spring in SHM oscillates between -A and A with time period T. If the spring starts from mean position and moves towards A, at what time will it be at a distance of A/2 from the mean position?

P

Pi

3 pi/2

pi

28 / 87

Maximum acceleration with zero velocity is possible only for:

NUMS 2018
Physics
Oscillations and Simple Harmonic Motion
Elimination Tool:

A) Non inertial frame of reference

B) Rotational motion

C) Simple Harmonic Motion

D) Random Motion

29 / 87

In S.H.M which of the following remains constant?

Total energy

P.F at extreme

K.E at mean

All of these

30 / 87

At which of the following places, motion of simple pendulum becomes slowest:

NUMS 2015
Physics
Oscillations and Simple Harmonic Motion
Elimination Tool:

A) Murree

B) Karachi

C) K-2

D) Peshawar

31 / 87

If the spring is halved, the new spring constant of each part will be:

3k

2k

4k

k/2

32 / 87

A body is executing simple harmonic motion if:

NTS 2015 SMBBMC
Physics
Oscillations and Simple Harmonic Motion
Elimination Tool:

A) Its acceleration is directly proportional to displacement and directed towards mean position

B) Its acceleration is inversely proportional to displacement and directed away from mean position

C) Its acceleration is inversely proportional to displacement and directed towards mean position

D) Its acceleration is directly proportional to displacement and directed away from mean position

33 / 87

Damping is the process whereby _______ is ______ from the oscillating system.

NUMS 2019 Reconduct
Physics
Oscillations and Simple Harmonic Motion
Elimination Tool:

A) Energy ; dissipated

B) Energy ; generated

C) Energy ; conserved

D) Energy ; stored

34 / 87

If f1 and f2 are frequencies of two tuning forks, such that f1 < f2, then number of beats produced in one second are: PMC Sample 2 Physics Oscillations and Simple Harmonic Motion Elimination Tool:

A) f2 – f1

B) f2 x f1

C) f1 – f2

D) f2 + f1

35 / 87

Two strings A and B of a sitar produces 6 beats per second. When the tension in string B is slightly reduced, beat frequency is reduced by 3 beats per second. If the frequency of string A is 324 Hz. then original frequency of string B was:

NUMS 2019 Cancelled
Physics
Oscillations and Simple Harmonic Motion
Elimination Tool:

A) 405

B) 402

C) 395

D) 318

36 / 87

A train is approaching a station at 90 km/h sounding a whistle of frequency 1000 Hz. What will be the apparent frequency heard by the listener sitting on the platform if the train moves away from the station at the same speed? (speed of sound= 340 m/s)

NTS 2015 DUHS and JSMU
Physics
Oscillations and Simple Harmonic Motion
Elimination Tool:

A) 931.5 Hz

B) 105.7 Hz

C) 135.9 Hz

D) 153.1 Hz

37 / 87

Two springs fixed at one end are stretched by 5 cm and 10 cm respectively when masses 0.5 kg and 1 kg are suspended at their lower ends. When displaced slightly from their mean positions and released, they will oscillate with time periods in the ratio:

NTS 2017
Physics
Oscillations and Simple Harmonic Motion
Elimination Tool:

A) 1 : √2

B) 1 : 2

C) √2 : 1

D) 2 : 1

38 / 87

A block of mass m = 2 kg is attached to an ideal spring of spring constant k = 200 Wm. The block is at rest at its equilibrium position. An impulsive force acts on the block, giving it an initial speed of 2 m/s. Find the amplitude of the resulting oscillations.

2

3

0.2

0.02

39 / 87

if a hole is dug to the center of earth and a ball is dropped in it, the ball will:

Be static

Attain max acceleration

Oscillate

Continue its motion till the other end and stop

40 / 87

If length of the pendulum is halved time ‘period will be?

T/sq root 2

T/2

T/3

T/4

41 / 87

Calculate the frequency if the number of revolutions is 300 and the paired poles are 50.

PMC Practice 6
Physics
Oscillations and Simple Harmonic Motion
Elimination Tool:

A) 15 kHz

B) 150 kHz

C) 1500 kHz

D) 150 Hz

42 / 87

Simple Harmonic Motion of a body is described by which statements mentioned below:

K : K.E is maximum when displacement x = 0

L : P.E is maximum when x = 0

M : P.E is maximum when x = ± x0

UHS 2018
Physics
Oscillations and Simple Harmonic Motion
Elimination Tool:

A) K and L

B) K and M

C) K, L and M

D) L and M

43 / 87

The total energy of a block, executing simple harmonic motion is:

NUMS 2019 Cancelled
Physics
Oscillations and Simple Harmonic Motion
Elimination Tool:

A) Independent of ‘x’

B) Proportional to ‘x’

C) Proportional to ‘x2’

D) Proportional to ‘x-2’

44 / 87

When the length of simple pendulum is doubled, the ratio of its new time period to old time period is:

UHS 2019
Physics
Oscillations and Simple Harmonic Motion
Elimination Tool:

A) 3√2

B) 1√2

C) 2√2

D) √2

45 / 87

What is the time period of sin(wt) ?

2πf

2πt

Both a and b

None of these

46 / 87

If length of a pendulum is 4 times g,.its time period will be:

4π

2π

π

π/2

47 / 87

Time period of simple pendulum depends on

Mass

Length of the pendulum

Acceleration due to gravity g

Both b and c

48 / 87

What will be impact on the frequency of a simple pendulum if the length of pendulum is halved
and value of gravity is doubled?

Halved

Doubled

Quadrupled

None of these

49 / 87

In the case of linear deformation, the ratio of tensile stress to tensile strain is called:

UHS 2018
Physics
Physics of Solids
Oscillations and Simple Harmonic Motion
Elimination Tool:

A) Energy stored in a stretched wire

B) Young’s double slit phenomenon

C) Bulk Modulus

D) Young’s Modulus

50 / 87

What will be the time period of pendulum if length becomes S times and g becomes 1/5 times at some height from the earth?

5t

t/5

15t

25t

51 / 87

A wave passes through a medium; each particle of the medium performs 100 complete vibrations in 5 seconds. What is the frequency of the wave?

PMC Practice 3
Physics
Oscillations and Simple Harmonic Motion
Elimination Tool:

A) 2 Hz

B) 20 Hz

C) 4 Hz

D) 40 Hz

52 / 87

In which of the following scenarios will the K.E be zero?

At maximum height when a ball is thrown upwards

At extreme position of a Simple Pendulum

At the amplitude of the Mass Spring System

All

53 / 87

A simple pendulum completes one oscillation in 4 seconds. Calculate its length when g= 9.8 m/s2, as the time period of a simple pendulum is given by T = 2 π √(l/g)

NTS 2015 DUHS and JSMU
Physics
Oscillations and Simple Harmonic Motion
Elimination Tool:

A) 3.973 m

B) 5.123 m

C) 7.111 m

D) 9.231 m

54 / 87

A progressive wave moving along the X axis is represented by y = [(2 π / λ – x)]. The wavelength at which the maximum particle velocity is 3 times the wave velocity is:

NUMS 2014
Physics
Oscillations and Simple Harmonic Motion
Elimination Tool:

A) A/3

B) 3π

C) 3 / 4λ A

D) 2 / 3 (πA)

55 / 87

According to hooke’s law:

F=-kx

F=kx

F=k/x

F=-k/x

56 / 87

The potential energy at the mean position of a pendulum is:

PMC 2021 Tested
Physics
Oscillations and Simple Harmonic Motion
Elimination Tool:

A) Half

B) Maximum

C) Minimum

D) 75%

57 / 87

in Damping

Energy it constant

Energy temalus in the system

Dissipated from the System

None of these

58 / 87

A force F = 0.12 N is applied on a spring and the spring elongates by 3 cm. The specific constant of the spring is?

NUMS 2017
Physics
Oscillations and Simple Harmonic Motion
Elimination Tool:

A) 0.4 Nm-2

B) 40 Nm-1

C) 400 Nm-1

D) 4 Nm-1

59 / 87

A simple pendulum with spring constant 500 n/m oscillates between two points x1 = 10cm and x2 = 15 cm. What is total mechanical energy at 10cm?

100001

62501

1562.51

None of these

60 / 87

Acceleration in the simple pendulum is always _______ to displacement.

PMC Practice 4
Physics
Oscillations and Simple Harmonic Motion
Elimination Tool:

A) Inversely proportional

B) Directly proportional

C) Acting negative

D) Independent

61 / 87

Second’s pendulum has frequency equal to?

0.5

1

2

4

62 / 87

An angular velocity of 60 revolutions per minute is the same as:

PMC Practice 4
Physics
Oscillations and Simple Harmonic Motion
Elimination Tool:

A) 1/2π rad/s

B) 120π rad/s

C) 30/π rad/s

D) 2π rad/s

63 / 87

In simple harmonic motion, acceleration will be maximum, when object is at:

UHS 2019
Physics
Oscillations and Simple Harmonic Motion
Elimination Tool:

A) Maximum displacement from the mean position

B) Center position

C) Half of the maximum displacement from mean position

D) Mean position

64 / 87

If mass attached to a spring and the spring constant of a spring are doubled, the resulting Time period will:

Remain Same

Be Doubled

Be Halved

Be Quartered

65 / 87

A steel wire hangs vertically from a fixed point, supporting a weight of 80 N at its lower end. The diameter of the wire is 0.50 mm and its length from the fixed point to the weight is 1.5 m. If density of steel wire = 7.8 x 103 kg/m3, then what is the fundamental frequency emitted from the wire.

PMC Sample 2
Physics
Oscillations and Simple Harmonic Motion
Elimination Tool:

A) 76 Hz

B) 176 Hz

C) 50 Hz

D) 150 Hz

66 / 87

For a stiff spring, the value of spring constant is:

NUMS 2019 Cancelled
Physics
Oscillations and Simple Harmonic Motion
Elimination Tool:

A) Higher

B) Lower

C) Intermediate

D) Zero

67 / 87

Acceleration of a body executing SHM is directed towards:

Extreme position

Peak point

Mean position

Point of maximum energy

68 / 87

If T is to be increased to 37 then length of pendulum should be increased by:

9 times

8 times

10 times

20 times

69 / 87

An aeroplane is flying in a straight line at a constant altitude. If a wing gust strikes and raises the nose of the airplane, the nose will bob up and down until the plane eventually returns to its original position. These oscillations are:

NUMS 2015
Physics
Oscillations and Simple Harmonic Motion
Elimination Tool:

A) Undamped

B) Underdamped

C) Critically damped

D) Overdamped

70 / 87

To double the total energy for a mass-spring system oscillating in SHM, by what factor must the amplitude increase?

NUMS 2015
Physics
Oscillations and Simple Harmonic Motion
Elimination Tool:

A) 4

B) 2

C) √2 = 1.414

D) ∜2 = 1.189

71 / 87

For a simple harmonic motion the acceleration of the body is _______ to displacement and always directed towards ________.

NUMS 2019 Reconduct
Physics
Oscillations and Simple Harmonic Motion
Elimination Tool:

A) Directly proportional ; maximum position

B) Inversely proportional ; maximum position

C) Directly proportional ; mean position

D) Directly proportional ; minimum position

72 / 87

A body of mass 4 kg attached to a spring is displaced through 0.04 m from its equilibrium position and then released. If the spring constant is 400 N/m, find the time period of the vibration?

NTS 2016 DUHS & JSMU
Physics
Oscillations and Simple Harmonic Motion
Elimination Tool:

B) 3.416

C) 2.315

D) 1.325

E) 0.628

73 / 87

If spring constant is 2 and displacement is also 2 then sum of KE and PE?

8 J

16J

4J

None of these

74 / 87

A spring is moving with SUM from X=10 cm to X=40 cm then it has maximum velocity at?

10cm

25cm

30cm

40cm

75 / 87

A pendulum oscillates on x-axis between 10 cm and 50 cm. Calculate its amplitude

60 cm

40 cm

30 cm

20 cm

76 / 87

A vibrator produces 25 waves in 5 seconds. What is its time period?

2

1/2

1/5

None of the above

77 / 87

The time of open vibration of a simple pendulum may be decreased by:

NTS 2017
Physics
Oscillations and Simple Harmonic Motion
Elimination Tool:

A) Increasing the length of the pendulum

B) Decreasing the length of the pendulum

C) Using a heavier bob

D) Using a lighter bob

78 / 87

In mass-spring system, which of the following does not depend on the initial displacement of the spring?

PMC Practice 4
Physics
Oscillations and Simple Harmonic Motion
Elimination Tool:

A) Maximum kinetic energy of the mass

B) Average speed of the mass

C) Total energy of the mass

D) Angular frequency of the oscillation

79 / 87

The total energy of pendulum is 501 what, will be its kinetic energy at mean position?

50J

25J

0J

None of these

80 / 87

When there is an increase in the length of the simple pendulum then its time period will:

NTS 2015 SMBBMC
Physics
Oscillations and Simple Harmonic Motion
Elimination Tool:

A) Remain the same

B) Decrease

C) First decrease then increase

D) Increase

81 / 87

In SHM the kinetic energy of the body is maximum when:

UHS 2018
Physics
Oscillations and Simple Harmonic Motion
Elimination Tool:

A) The body is at mean position

B) The body is at extreme position from the mean

C) The body is exactly half way down between mean and extreme position

D) The body is somewhere between mean and extreme position

82 / 87

Seconds pendulum has time period

1 sec

2 sec

4 sec

0.5 sec

83 / 87

A simple pendulum is suspended from the ceiling of a lift has a time period T when the lift is at rest. when it fall freely

Time period becomes zero

Acceleration becomes zero

Vibration is stopped

None of these

84 / 87

Which of the following changes must when a wave changes its medium?

Frequency

Amplitude

Speed

) None of these

85 / 87

The object oscillates due to:

PMC Sample 2
Physics
Oscillations and Simple Harmonic Motion
Elimination Tool:

A) a restoring force

B) its weight

C) centripetal force

D) force of friction

86 / 87

A student is performing a lab experiment on simple harmonic motion. He has two different springs (with force constants k1 and k2) and two different blocks (of masses m1 and m2). If k1 =2k2, and m1 = 2m2 , which of the following combinations would give the student the spring-block simple harmonic oscillator with the shortest period?

NTS 2014
Physics
Oscillations and Simple Harmonic Motion
Elimination Tool:

A) The spring with force constant k1 and the block of mass m1

B) The spring with force constant k1 and the block of mass m2

C) The spring with force constant k2 and the block of mass m1

D) The spring with force constant k2 and the block of mass m2

87 / 87

When frequency of applied periodic Force is equal to the natural frequency of harmonic oscillator then the _______ of oscillator _____.

NUMS 2019 Reconduct
Physics
Oscillations and Simple Harmonic Motion
Elimination Tool:

A) amplitude : decreases

B) Amplitude : increases

C) Frequency : increases

D) Frequency : decreases

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