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Waves Physics - Waves

Uttarakhand Board (UBSE) - STD 11 Science - Physics (Uttarakhand - English Medium). 46 questions in this chapter.

Question types

Waves question types

46 questions across 5 question groups — pick any mix to generate a Physics paper with step-by-step answer keys.

46
Questions
5
Question groups
5
Question types
Sample Questions

Waves questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 1M.C.Q (1 Marks)1 Mark
A train whistling at constant frequency is moving towards a station at a constant speed V. The train goes past a stationary observer on the station. The frequency n′ of the sound as heard by the observer is plotted as a function of time t Identify the expected curve:
 
  • A
  • B
  • ✓
  • D

Answer: C.

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Q 2M.C.Q (1 Marks)1 Mark
During propagation of a plane progressive mechanical wave:
  • A
    All the particles are vibrating in the same phase.
  • B
    Amplitude of all the particles is equal.
  • C
    Particles of the medium executes $\text{S.H.M.}$
  • ✓
    All of the above

Answer: D.

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Q 3M.C.Q (1 Marks)1 Mark
Which of the following statements are true for a stationary wave?
  • A
    Every particle has a fixed amplitude which is different from the amplitude of its nearest particle.
  • B
    All the particles cross their mean position at the same time.
  • C
    All the particles are oscillating with same amplitude.
  • ✓
    All of the above

Answer: D.

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Q 4M.C.Q (1 Marks)1 Mark
Speed of sound waves in a fluid depends upon:
  • A
    Directty on density of the medium.
  • B
    Directly on the square root of bulk modulus of the medium.
  • C
    Inversly on the square root of density.
  • ✓
    Both $B$ and $C$

Answer: D.

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Q 5M.C.Q (1 Marks)1 Mark
Water waves produced by a motor boat sailing in water are:
  • A
    Neither longitudinal nor transverse.
  • ✓
    Both longitudinal and transverse.
  • C
    Only longitudinal.
  • D
    Only transverse.

Answer: B.

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Q 61 Marks Question1 Mark
For the harmonic travelling wave $\text{y}=2\cos2\pi(10\text{t}-0.0080\text{x}+3.5)$ where x and y are in cm and t is second. What is the phase difference between the oscillatory motion at two points separated by a distance of:$\frac{\lambda}{2}$
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Q 91 Marks Question1 Mark
Given below are some functions of x and t to represent the displacement of an elastic wave.$\text{y}=4\sin(5\text{x}-\text{t/ 2})+3\cos(5\text{x}-\text{t/ 2})$
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Q 101 Marks Question1 Mark
For the harmonic travelling wave $\text{y}=2\cos2\pi(10\text{t}-0.0080\text{x}+3.5)$ where x and y are in cm and t is second. What is the phase difference between the oscillatory motion at two points separated by a distance of:0.5m
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Q 132 Marks Questions2 Marks
Given below are some functions of x and t to represent the displacement of an elastic wave.$​​​​\text{y}=10\cos[(252-250)\pi\text{t}]\cos[(252+250)\pi\text{t}]$
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Q 163 Marks Question3 Marks
 A train standing at the outer signal of a railway station blows a whistle of frequency $400 Hz$ still air. The train begins to move with a speed of $10 m s ^{-1}$ towards the platform. What is the frequency of the sound for an observer standing on the platform? (sound velocity in air = $\left.330 m s ^{-1}\right)$
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Q 173 Marks Question3 Marks
A tuning fork A, marked 512Hz, produces 5 beats per second, where sounded with another unmarked tuning fork B. If B is loaded with wax the number of beats is again 5 per second. What is the frequency of the tuning fork B when not loaded?
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Q 183 Marks Question3 Marks
A steel wire has a length of $12m$ and a mass of $2.10kg$. What will be the speed of a transverse wave on this wire when a tension of $2.06 \times 10^4N$ is applied?
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Q 195 Marks Questions5 Marks
A tuning fork vibrating with a frequency of 512Hz is kept close to the open end of a tube filled with water The water level in the tube is gradually lowered. When the water level is 17cm below the open end, maximum intensity of sound is heard. If the room temperature is 20° C, calculate
  1. Speed of sound in air at room temperature
  2. Speed of sound in air at 0° C
  3. If the water in the tube is replaced with mercury, will there be any difference in your observations?
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Q 205 Marks Questions5 Marks
An organ pipe of length L open at both ends is found to vibrate in its first harmonic when sounded with a tuning fork of 480Hz. What should be the length of a pipe closed at one end, so that it also vibrates in its first harmonic with the same tuning fork?
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Q 215 Marks Questions5 Marks
A sitar wire is replaced by another wire of same length and material but of three times the earlier radius. If the tension in the wire remains the same, by what factor will the frequency change?
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Q 225 Marks Questions5 Marks
A sonometer wire is vibrating in resonance with a tuning fork. Keeping the tension applied same, the length of the wire is doubled. Under what conditions would the tuning fork still be is resonance with the wire?
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Q 235 Marks Questions5 Marks
In the given progressive wave $​​​​\text{y}=5\sin(100\pi\text{t+0.4x})$ where y and x are in m, t is in s. What is the:
Particle velocity amplitude.
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