CHAPTER # 7: OSCILLATIONS 1. The S.I units of spring constant are: a) −1 b) −1 c) ...
CHAPTER #
7: OSCILLATIONS
1. The S.I units of spring constant are:
a)
−1
b)
−1
c)
−2
d)
2
2.
If = 0.08 and = 4then =:
a)
6
−1
b)
4
−1
c)
8
−1
d)
2
−1
3.
One
complete round trip of a vibrating body is called
a) Time period
b) Frequency
c) Vibration
d) Amplitude
4.
The time
required to complete one vibration is called
a) Time period
b) Frequency
c) Time period
d) Velocity
5. The force which opposes the
applied force producing the displacement in the spring is called
a) Restoring force
b) Periodic force
c) Centripetal force
d) Resistive force
6. The number of vibrations
completed by a body in one second is called
a) Time period
b) Frequency
c) Total vibrations
d) Displacement
7. Simple harmonic motion is a type of:
a) Rotational motion
b) Circular motion
c) Musical arrangement
d) Vibratory motion
8.
In SHM,
the restoring force is directly proportional to
a) Velocity
b) Acceleration
c) Displacement
d) Time period
9. Theexpression for instantaneous displacement of
particle executing SHM is:
a)
= −
2
b)
=
0 sin
c)
=
d)
All of
above
10. Acceleration of a projection on
the diameter for a particle moving along a circle is:
a)
w2x
b)
wx2
c)
–w2x
d) –wx2
11.
In
equation of SHM, = −
2 , the negative sign indicates
the direction of motion of particle
a) Away from mean position
b) Perpendicular to mean position
c) Towards mean position
d) None of above
12. If f is the frequency of a body
executing SHM, its angular frequency is:
a)
4
b)
3
c)
2
d)
None of
these
13. The distance of vibrating body at
any instant from its equilibrium position is called
a) Displacement
b) Frequency
c) Amplitude
d) Time period
14. SI unit of frequency is:
a) Radian
b)
−1
c)
Hertz
d) Meter
15. The product of time period and
frequency is:
a) Zero
b) 1
c)
d)
None of
these
16.
The phase
angle = of the body performing SHM indicates:
a) Only direction of motion
b) Only magnitude of displacement
c)
Both
magnitude of displacement and direction of motion
d) None of these
17. In SHM, the velocity of the
particle is maximum at:
a) Mean position
b) Extreme position
c) In between mean and extreme position
d) None
18. Angular velocity of vibrating
body attached with horizontal mass spring system is given by:
a)
=
b)
=
c)
=
d)
=
19. For a body executing S.H.M, its
a) Momentum remains constant
b) Potential energy remains constant
c) Kinetic energy remains constant
d) Total energy remains constant
20. If the displacement of a body
executing S.H.M is plotted against time, then the curve is known
a) Frequency of S.H.M
b) Period of S.H.M
c) Wave form
d) None of them
21. The waveform of simple harmonic
motion is:
a) Sine wave
b) Square wave
c) Pulsed wave
d) None of these
22. Frequency of the second pendulum is:
a) 2.5 Hz
b) 0.5 Hz
c) 1.5 Hz
d) 2 Hz
23. The time period of a second pendulum is-
a) 4 seconds
b) 3 seconds
c) 2 seconds
d) 6 seconds
24. The length of second pendulum is.
a) 100 cm
b) 99 cm
c) 99.2 cm
d) 98 cm
25. The restoring force acting on
simple pendulum is given by.
a)
mg sin θ
b)
– mg sin θ
c)
mg cos θ
d)
– mg cos θ
26. Which expression is correct for
the time period of a simple pendulum:
a)
∝
b)
∝
c)
∝
d)
∝
27. An object undergoes S.H.M has
maximum speed when its displacement from the mean position is
a) Maximum speed
b) Zero
c) Half of the maximum value
d) One third of the maximum value
28. An object undergoes S.H.M has
maximum acceleration when its displacement form the mean position is
a) Maximum
b) Zero
c) Half of the maximum value
d) One third of the maximum value
29. In simple harmonic motion:
a) P.E remains constant
b) K.E remain constant
c) Total energy remain constant
d) Total momentum remain constant
30. The motion of simple pendulum is
SHM only if:
a) Amplitude is large
b) Mass is small
c) Amplitude is small
d) Length is small
31. In S.H.M, the velocity of a
particle is maximum at:
a) Mean position
b) Extreme position
c)
Middle
between mean and extreme position on the right side
d)
Middle
between mean and extreme position on the left side
32. The displacement of SHM is
written as X = Xo sinωt, If displacement is written by X = Xo cosωt then phase constant will
be equal to:
a)
0o
b)
45 o
c)
90 o
d)
180 o
33.
The angle
= which specifies the displacement as well as direction of motion of the
point executing SHM is known as:
a) Critical angle
b) Phase angle
c) Plane angle
d) Solid angle
34. Phase of SHM describes.
a) Displacement only
b) Direction of motion only
c)
Both
displacement and direction of motion
d)
Neither
displacement nor direction of motion
35. Natural frequency of simple
pendulum depends upon:
a) Its mass
b) Its length
c) Square of its length
d) Square root of its length
36. The process in which energy is
dissipated in oscillating system is called:
a) Resonance
b) Damping
c) Forced oscillation
d) None of these
37. In damped harmonic oscillation,
which one deceases?
a) Amplitude of vibration
b) Energy of vibration
c) Both amplitude and energy
d) Neither amplitude nor energy
38. A physical system undergoing
forced vibrations is known as
a) Driven harmonic oscillator
b) Resonance
c) Simple harmonic oscillator
d) None of above
39.
When is
small, sin is approximately equal to
a)
2
b)
Zero
c)
d)
2
40. At mean position, during SHM:
a) P.E is maximum and K.E is minimum
b) P.E is minimum and K.E is maximum
c) Both K.E and P.E are maximum
d) Both K.E and P.E are minimum
41. When the bob of simple pendulum
is at extreme position, it has
a) K.E
b) P.E
c) Both P.E and K.E
d) None
42. Tuning of radio set is an example of
a) Mechanical resonance
b) Musical resonance
c) Electrical resonance
d) Free vibration
43. The frequency of waves produced
in microwaves oven is:
a) 1435 MHz
b) 2450 MHz
c) 1860 MHz
d) 2850 MHz
44. Sharpness of resonance is.
a) Directly proportional to damping force
b)
Inversely
proportional to damping force
c) Equal to square of damping force
d) None of these
45. Which one does not work according
to resonance?
a) T.V
b) Radio
c) Microwave oven
d) Bulb
46. The oscillations in which
amplitude decreased steadily with time are called:
a) Natural oscillations
b) Free oscillation
c) Damped oscillations
d) Forced oscillations
47. Distance covered during one
vibration of an oscillating body in term of amplitude A is:
a)
2
b)
c)
2
d)
4
Q. No.
|
Ans.
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Q. No.
|
Ans.
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Q. No.
|
Ans.
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1
|
b
|
17
|
a
|
33
|
b
|
2
|
d
|
18
|
c
|
34
|
c
|
3
|
c
|
19
|
d
|
35
|
d
|
4
|
a
|
20
|
c
|
36
|
b
|
5
|
a
|
21
|
a
|
37
|
c
|
6
|
b
|
22
|
b
|
38
|
a
|
7
|
d
|
23
|
c
|
39
|
c
|
8
|
c
|
24
|
c
|
40
|
b
|
9
|
b
|
25
|
b
|
41
|
b
|
10
|
c
|
26
|
c
|
42
|
c
|
11
|
c
|
27
|
b
|
43
|
b
|
12
|
c
|
28
|
a
|
44
|
b
|
13
|
a
|
29
|
c
|
45
|
d
|
14
|
c
|
30
|
c
|
46
|
c
|
15
|
b
|
31
|
a
|
47
|
d
|
16
|
c
|
32
|
c
|
COMMENTS