Olete.in – MCQs, Mock Tests & Government Job Prep | ECAT ECAT Physics Oscillations Mcq Questions

In vibratory motion

1. P.E. remains constant
2. K.E. remain constant
3. total energy remain constant
4. total momentum remain constant

✅ Correct Answer: 1

The waveform of S.H.M. is

1. standing wave
2. sine wave
3. square wave
4. none

✅ Correct Answer: 2

S.I unit of frequency is

1. vibration S-2
2. radian
3. hertz
4. ms-1

✅ Correct Answer: 2

In S.H.M. the velocity of a particle is maximum at

1. mean position
2. extreme position
3. middle between mean and extreme position on the right side
4. middle between mean and extreme position on the left side

✅ Correct Answer: 1

The acceleration of a projection on the diameter for a particle moving along a circle is

1. w2x
2. wx2
3. w2x
4. wx2

✅ Correct Answer: 3

Total energy of a body executing S.H.M is directly proportional to

1. square root of amplitude
2. the amplitude
3. reciprocal of amplitude
4. square of amplitude

✅ Correct Answer: 4

The time period of a second pendulum is

1. 4 seconds
2. 3 seconds
3. 2 seconds
4. 6 seconds

✅ Correct Answer: 3

The length of second pendulum is

1. 100 cm
2. 99 cm
3. 99.2 cm
4. 98 cm

✅ Correct Answer: 3

If length of second pendulum becomes four times then its time period will become

1. four times
2. six times
3. eight times
4. two times

✅ Correct Answer: 4

The force responsible for the vibratory motion of the simple pendulum is

1. mg cos?
2. mg sin?
3. mg ton?
4. mg

✅ Correct Answer: 2

The frequency of the second pendulum is

1. 1 hertz
2. 0.5 hertz
3. 1.5 hertz
4. 2.5 hertz

✅ Correct Answer: 2

The SI unit of force constant is identical with that of

1. force
2. pressure
3. surface tension
4. loudness

✅ Correct Answer: 3

When the amplitude of a wave become double its energy become

1. double
2. four times
3. one half
4. none time

✅ Correct Answer: 2

A simple pendulum suspended form the ceiling of a lift has time period T when the lift is at rest. When the lift falls freely the time period is

1. infinite
2. T/g
3. zero
4. g/T

✅ Correct Answer: 1

The energy of SHM is maximum at

1. mean position
2. extreme position
3. in between mean and extreme
4. all positions during SHM

✅ Correct Answer: 4

The displacement of SHM is written as X = X? sin?t if displacement is written by X = X? son ?t then phase constant will be equal to

1. 0?
2. 45?
3. 90?
4. 180?

✅ Correct Answer: 3

The product of frequency and time period is equal to

1. 1
2. 2
3. 3
4. 4

✅ Correct Answer: 1

For what displacement the P.E becomes 1/4 of its maximum value?

1. x = x?
2. x = x?/2
3. x = x?/4
4. x = x?2/2

✅ Correct Answer: 2

Sharpness of resonance is

1. directly proportional to damping force
2. inversely proportional to damping force
3. equal to square of damping force
4. equal to square of damping force

✅ Correct Answer: 2

Which one dows not work according to resonance?

1. T.V
2. radio
3. microwave oven
4. bulb

✅ Correct Answer: 4

The restoring force acting on simple pendulum is given by

1. mg sin ?
2. mg sin ?
3. mg cos ?
4. mg cos ?

✅ Correct Answer: 2

Phase of SHM describes

1. displacement only
2. direction of motion only
3. both displacement and direction of motion
4. neither displacement nor direction of motion

✅ Correct Answer: 3

Natural frequency of simple pendulum depends upon

1. its mass
2. its length
3. square of its length
4. square root of its length

✅ Correct Answer: 4

Electrical resonance is observed in

1. radio
2. microwave oven
3. both in radio and microwave oven
4. neither in radio nor in microwave oven

✅ Correct Answer: 1

Total distance traveled by bob of simple pendulum in one vibration is equal to

1. amplitude
2. square of amplitude
3. 2 x amplitude
4. 4 x amplitude

✅ Correct Answer: 4

When K.E energy of SHM is maximum its

1. P.E is zero
2. acceleration is zero
3. restoring force is zero
4. all P.E acceleration and restoring force are zero

✅ Correct Answer: 4

In damped harmonic oscillation which one decreases?

1. amplitude of vibration
2. energy of vibration
3. both amplitude and energy
4. neither amplitude nor energy

✅ Correct Answer: 3

Forced vibration are known as

1. simple harmonic vibration
2. natural vibration
3. driven harmonic vibration
4. free vibration

✅ Correct Answer: 3

Mass attached to a spring executes.

1. vibratory motion
2. rotatory motion
3. S.H.M
4. both (a) and c

✅ Correct Answer: 4

At Murree Hills (Assume value of g changes). If we use a simple pendulum as time standard then one second duration will.

1. increase
2. decrease
3. remains same
4. is zero

✅ Correct Answer: 1

The velocity of the mass attached to a spring is maximum at

1. mean position
2. extreme position
3. both (a) and (b)
4. none

✅ Correct Answer: 1

The projection of the particle moving in a circle with non-uniform speed executes.

1. S.H.M
2. Vibratory motion
3. Both (b) and (d)
4. None S.H.M

✅ Correct Answer: 3

Displacement of the body in S.H.M is equal to amplitude when body is at

1. mean position
2. else where
3. extreme position
4. none

✅ Correct Answer: 3

For a simple pendulum the restoring force is caused by

1. gravity
2. spring
3. hand
4. all of these

✅ Correct Answer: 1

The distance covered by a body in one complete vibration is 20cm. What is the amplitude of body

1. 10 cm
2. 5 cm
3. 15 cm
4. 7.5 cm

✅ Correct Answer: 2

A cup of milk is placed in a microwave oven. Tell which statements is false (1) Milk will be heated up only (2) Cup will remain cool (3) Both cup and mild will get hot.

1. both
2. 1
3. 2
4. 3

✅ Correct Answer: 4

In case of a simple pendulum the cause of damping is

1. drag force of air
2. gravity
3. tension in string
4. none of these

✅ Correct Answer: 1

The energy absorbed by a body is ________________ at resonance.

1. maximum as well minimum
2. minimum only
3. maximum only
4. zero

✅ Correct Answer: 3