Chapter 7 Oscillations MCQs
1.
An
oscillatory motion takes place under the action of
(a)
an
applied force
(b)
gravitational
force
(c)
an
elastic restoring force and inertia
(d)
periodic
force
2. Simple harmonic motion is a type of
(a)
linear
motion (b)
rotational motion
(c)
circular motion (d)
none of these
3. In a vibratory motion, the
(a)
KE
of the vibrating body remains constant
(b)
PE
of the vibrating body remains constant
(c)
total
energy of the vibrating body remains constant
(d)
total
momentum of the vibrating body remains constant
4. In simple harmonic motion, the acceleration
of a vibrating body is
(a)
inversely
proportional to the displacement
(b)
directly
proportional to the displacement
(c)
directly
proportional to the applied force
(d)directly
proportional to the displacement and oppositely directed
5. The waveform a body executing SHM is
(a)
square
wave (b)
sine wave
(c) circular wave (d)
pulse
6. At mean position during SHM
(a)
PE
is maximum and KE is minimum (b) PE is minimum and KE is maximum
(c) both KE and PE are maximum
(d) both KE and PE are minimum
7. Frequency is related to time period by.
8. The total energy of a body executing SHM is
directly proportional to
(a)
its
amplitude
(b)
square
of its amplitude
(c)
reciprocal
of its amplitude
(d)
square
root of its amplitude
9. Two identical springs of same spring
constant k and length are joined to form a single long spring. The spring
constant of this spring will be
(a)
2
k (b)
k
k
(c) (d)
none of these
2
10. If the length of a simple pendulum increases
four times, its natural frequency becomes
(a)
doubled (b)
four times
(c) one half (d)
none of these
11. A second's pendulum is one whose time period
is equal to
(a)
1s
(b)
2s
(c)
changes
from place to place
(d)
none
of these
12. Length of a second's pendulum at a place
where g = 9.8 ms-2 is
(a)
1.2
m (b)
0.992 m
(c)
0.5 m (d)
2 m
14. Time period of a simple pendulum oscillating
in vacuum depends upon
(a)
mass
of the pendulum
(b)
length
of the pendulum
(c)
length
and acceleration due to gravity
(d)
none
of these
15. The motion of a simple pendulum will be
slowest
(a)
at
the poles (b) at the equator
(c) at the centre of Earth (d) in air
16. If the mass attached with a spring is
increased, its frequency of vibration
(a)
decreases
(b) increases
(c)
remains constant (d)
none of these
17. An object is moving simple harmonically. As
it moves towards the mean position, its (a) velocity
and PE increase
(b)
velocity
and PE decrease
(c)
acceleration
and PE decrease
(d)
acceleration
and PE increase
19. The total energy of a body executing SHM is
2 2
(a)
kxo (b)
kxo
1 2 2
(c)
2kxo (d)
2 kxo
21. An oscillating simple pendulum comes to rest
after some time because
(a)
air
resistance opposes its motion
(b)
of
air resistance and frictional forces
(c)
of
tension is the string (d)
of gravity.
22. The time period of a simple pendulum is
independent of
its
(a)
length (b)
mass
(c)
g (d)
string
23. The frequency of a vibrating mass-spring
system is proportional to
25. The frequency of a second's pendulum is
(a)
2
Hz (b)
1 Hz
(c) 0.5 Hz (d)
1.5 Hz
26. SI unit of force constant is
(a)
N (b)
Nm-1
(c)
Nm (d)
None of these
27. The acceleration of the projection on the
diameter axis for a particle moving along a circle is
(a)
–
2 (b)
– 2 x
(c)
x2
(d)
– 2 x2
28. At its extreme position, the potential
energy of the simple pendulum is
(a)
zero
(b) one half of the kinetic energy
(c) maximum (d) may have any value
29. The force that provides energy to a damped
oscillator is called
(a)
weight (b)
damping force
(c)
driving force (d) frictional force
30. Microwave ovens produce waves of frequency
(a)
2450
kHz (b)
245 MHz
(c) 2450 MHz (d) 24.50 MHz
31. Periodic motion is one that
(c)
is
back and forth over the path
(d)
under
the influence of an elastic restoring force
(e)
does
not repeat itself
(f)
repeats
itself after regular intervals of times
32. Waveform of simple harmonic motion is a
(a)
pulsed
wave (b)
sine wave
(c)
square wave (d) stationary wave
33. The quantity describing both displacement as
well as
direction of motion of
a vibrating body is called its
(a)
angular
velocity of motion
(b)
phase
of motion
(c)
period
of motion
(d)
frequency
of vibration.
34. The maximum velocity of a horizontal mass
spring system is given by
k m
(a)
vo
m (b) vo k k m
(c)
xo m (d)
xo k
35. A physical system undergoing forced
vibrations is called
(a)
damped
oscillator
(b)
un-damped
oscillator
(c)
driven
oscillator
(d)
ideal
oscillator
36. Damping results in
(a)
creation
of energy (b) dissipation of energy
(c) irregular vibrations (d)
neither of these
37. A heavily damped oscillator has a
(a)
sharp
resonance curve (b) good
quality
(c)
both ‘a’ and ‘b’ (d) flat resonance curve
38. The instantaneous position of an oscillator
is described by the equation x = x0 cos 4t.
The frequency of the oscillator is
(a)
4
Hz (b)
2 Hz
(c)
0.5 Hz (d)
0.25 Hz
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