Oscillations and Waves MCQ Questions with Answers Class 11 Physics
Question- Which of the following equations does not represent a simple harmonic motion ?
(a) y = a sin ω t
(b) y = b cos ω t
(c) y = a sin ω t + b cos ω t
(d) y = a tan ω t
Ans-(d)
Question- A particle of mass 0.1 kg is executing SHM of amplitude 0.1 m. When the particle passes through the mean position, its K.E. is 8 × 10–3 J. The equation of motion of the particle,when the initial phase of oscillation is 45o, is
(a) y = 0.1 cos (3 t + Π/4)
(b) y = 0.1 sin (3 t + Π/4)
(c) y = 0.1 sin (4 t + Π/4)
(d) y = 0.1 cos (4 t + Π/4)
Ans-(c)
Question- The phase difference between x1 = A sinωt and x2 = A cos ω t is :
(a) Π/2
(b) Π/4
(c) Π/3
(d) Π/6
Ans-(a)
Question- A particle is performing S.H.M. along X-axis with amplitude 4 cm and time period 1.2 sec. The minimum time taken by the particle to move from x = + 2 cm to x = + 4 cm and back again
is given by
(a) 0.6 s
(b) 0.4 s
(c) 0.3 s
(d) 0.2 s
Ans-(b)
Question- The time taken by a particle executing S.H.M. of period T to move from the mean position to half the maximum displacement is
(a) T/2
(b) T/4
(c) T/8
(d) T/12
Ans-(d)
13.Question- (a) f/2
(b) f
(c) 2 f
(d) 4 f
Ans-(c)
Question- What is the ratio of maximum acceleration to the maximum velocity of a simple harmonic oscillator ?
(a) ω
(b) ω/2
(c) 1/ω
(d) 2ω
Ans-(a)
Question- If a conservative force is acting on a system in SHM. The total mechanical energy is :
(a) time dependent
(b) position dependent
(c) amplitude dependent
(d) Both (a) and (c) are correct
Ans-(c)
Question- A mass of 1 kg attached to the bottom of a spring has a certain frequency of vibration. The following mass has to be added to it in order to reduce the frequency by half.
(a) 1 kg
(b) 2 kg
(c) 3 kg
(d) 4 kg
Ans-(c)
Question- The period of oscillation of a mass m suspended from a spring is 2 seconds. If along with it another mass of 2 kg is also suspended, the period of oscillation increases by one second. The mass m will be
(a) 2 kg
(b) 1 kg
(c) 1.6 kg
(d) 2.6 kg
Ans-(c)
Question- Here, tension in the string (T) at extreme ... A ... . Here, A refers to
(a) mg
(b) mg cos θ
(c) mg sin θ
(d) zero
Ans-(b)
Question- In the previous question, the tension at the equilibrium position is
(a) greater than mg
(b) less than mg
(c) equal to mg
(d) information insufficient
Ans-(a)
Question- A simple pendulum is suspended from the ceiling of a lift.When the lift is at rest its time period is T. With what acceleration should the lift be accelerated upwards in order to reduce its period to T/2? (g is acceleration due to gravity).
(a) 2g
(b) 3g
(c) 4g
(d) g
Ans-(b)
Question- A body is moving in a room with a velocity of 20 m/s perpendicular to the two walls separated by 5 m. There is no frictrion and the collisions with the walls are elastic. The motion of the body is
(a) not periodic
(b) periodic but not simple harmonic
(c) periodic and simple harmonic
(d) periodic with variable time period
Ans-(b)
Question- The drag force on the vane is directly proportional to:
(a) velocity of vane
(b) displacement of vane
(c) spring constant
(d) mass of the block
Ans-(a)
Question- The net force acting on the block of mass m is :
(a) kx – bv
(b) –kx – bv
(c) –kx + bv
(d) None of these
Ans-(b)
Question- A string is stretched between fixed points separated by 75.0 cm.It is observed to have resonant frequencies of 420 Hz and 315 Hz. There are no other resonant frequencies between these two. Then the lowest resonance frequency for this string is
(a) 1.05 Hz
(b) 1050 Hz
(c) 10.5 Hz
(d) 105 Hz
Ans-(d)
Question- A stretched string of length 1 m and mass 5 × 10–4 kg, fixed at both ends, is under a tension of 20 N. If it is plucked at points situated at 25 cm from one end, it would vibrate with a frequency :
(a) 400 Hz
(b) 200 Hz
(c) 100 Hz
(d) 256 Hz
Ans-(b)
Question- An open organ pipe of length l vibrates in its fundamental mode. The pressure variation is maximum :
(a) at the two ends
(b) at the distance l/2 inside the ends
(c) at the distance l/4 inside the ends
(d) at the distance l/8 inside the ends
Ans-(b)
Question- A pipe closed at one end and open at the other end resonates with sound waves of frequencies 135 Hz and also 165 Hz but not with any wave of frequency intermediate between these two. The frequency of the fundamental note is :
(a) 30 Hz
(b) 15 Hz
(c) 60 Hz
(d) 7.5 Hz
Ans-(b)
Question- A pipe closed at one end and open at the other end resonates with sound waves of frequency 135 Hz and also 165 Hz but not with any wave of frequency intermediate between these two. Then the frequency of the fundamental note is
(a) 30 Hz
(b) 15 Hz
(c) 60 Hz
(d) 7.5 Hz
Ans-(b)
Question- A tuning fork vibrating with a sonometer having 20 cm wire produces 5 beats/s. The beat frequency does not change if the length of the wire is changed to 21 cm. The frequency of the tuning fork must be :
(a) 200 Hz
(b) 210 Hz
(c) 205 Hz
(d) 215 Hz
Ans-(c)
Question- A source of frequency v gives 5 beats/s when sounded with a frequency 200 Hz. The second harmonic of source gives 10 beats/s when sounded with a source of frequency 420 Hz. The value of v is :
(a) 200 Hz
(b) 210 Hz
(c) 205 Hz
(d) 195 Hz
Ans-(c)
Question- Two trains, each moving with a velocity of 30 m/s, cross each other. One of the trains gives a whistle whose frequency is 600 Hz. If the speed of sound is 330 m/s, the apparent frequency for passengers sitting in the other train before crossing would be :
(a) 600 Hz
(b) 630 Hz
(c) 920 Hz
(d) 720 Hz
Ans-(d)
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