Which of the following figure represents damped harmonic motion?

(i)
(ii)
(iii)
(iv)

1. (i) and (ii)

2. (iii) and (iv)

3. (i), (ii), (iii), and (iv)

4. (i) and  (iv)

Subtopic:  Damped Oscillations (OLD NCERT) |
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The damping force of an oscillator is directly proportional to the velocity. The units of the constant of proportionality are:
1. kg-msec-1
2. kg-msec-2
3. kg-sec-1
4. kg-sec

Subtopic:  Damped Oscillations (OLD NCERT) |
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A particle with restoring force proportional to the displacement and resisting force proportional to velocity is subjected to a force, F=F0 sin ωt

If, the amplitude of the particle is maximum for ω=ω1 and the energy of the particle is maximum for ω=ω2, then

1. ω1=ω0 and ω2ω0

2. ω1=ω0 and ω2=ω0

3. ω1ω0 and ω2=ω0

4. ω1ω0 and ω2ω0

Subtopic:  Forced Oscillations (OLD NCERT) |
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The amplitude of a damped oscillator decreases to 0.9 times its original magnitude in 5 s. In another 10 s, it will decrease to α times its original magnitude, where α equals

1. 0.7

2. 0.81

3. 0.729

4. 0.6

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Which of the following is not true for damped oscillations with time period T and an initial amplitude a?
1.  Angular frequency is slightly less than the natural frequency.
2.  Force remains constant in time interval t = 0 to t = T8.
3.  If amplitude after time t is aN, then the amplitude after time 2t will be aN2.
4.  Total mechanical energy decreases exponentially.

Subtopic:  Damped Oscillations (OLD NCERT) |
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For damped oscillations, the graph between energy and time will be:

1. 2.
3. 4.
Subtopic:  Damped Oscillations (OLD NCERT) |
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The amplitude of a damped oscillator becomes one-third in 10 minutes and 1n times of the original value in 30 minutes. The value of n is:

1.  81

2.  3

3.  9

4.  27

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A particle executes simple harmonic oscillations under the effect of small damping. If the amplitude of oscillation becomes half of the initial value of 16 mm in five minutes, then what will be the amplitude after fifteen minutes?

1.  8 mm

2.  4 mm

3.  2 mm

4.  1 mm

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In a forced oscillation, when the system oscillates under the action of the driving force F = F0 sin ωt in addition to its internal restoring force, the particle oscillates with a frequency equal to

1.  The natural frequency of the body

2.  Frequency of driving force

3.  The difference in frequency of driving force and natural frequency

4.  Mean of the driving frequency and natural frequency

Subtopic:  Forced Oscillations (OLD NCERT) |
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A body executes oscillations under the effect of a small damping force. If the amplitude of the body reduces by 50% in 6 minutes, then amplitude after the next 12 minutes will be [initial amplitude is A0] -

1.  A04

2.  A08

3.  A016

4.  A06

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