Engineering Physics Questions and Answers – Superposition of Waves

This set of Engineering Physics Multiple Choice Questions & Answers (MCQs) focuses on “Superposition of Waves”.

1. Which is different from others by units?
a) Phase difference
b) Mechanical equivalent
c) Loudness of sound
d) Poisson’s ratio
View Answer

Answer: d
Explanation: Of all the given quantities, Poisson’s ratio has no units.

2. The waves, in which the particles of the medium vibrate in a direction perpendicular to the direction of wave motion, is known as __________
a) Transverse waves
b) Longitudinal waves
c) Propagated waves
d) Magnetic waves
View Answer

Answer: a
Explanation: In transverse waves, particles of the medium vibrate in a direction perpendicular of the wave

3. The waves produced by a motor boat sailing in water are __________
a) Transverse
b) Longitudinal
c) Longitudinal and transverse
d) Stationary
View Answer

Answer: c
Explanation: Transverse waves are generated on the water surface. Inside water longitudinal waves longitudinal waves are produced due to vibrations of the rudder.

4. For a wave propagating in a medium, identify the property that is independent of the others.
a) Velocity
b) Wavelengths
c) Frequency
d) All these depend on each other
View Answer

Answer: c
Explanation: Wave velocity=frequency×wavelength
Frequency remains unchanged while velocity and wavelength and interdependent.

5. A boat at anchor is rocked by waves, whose crests are 100m apart and velocity is 25m/s. The boat bounces up once in every __________
a) 2500s
b) 75s
c) 4s
d) 0.25s
View Answer

Answer: c
Explanation: ʎ=100m, v=25m/s
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6. A transverse wave passes through a string with the equation
Where x is in metres and t in seconds. What is the maximum velocity of the particles in wave motion?
a) 63m/s
b) 78m/s
c) 100m/s
d) 121m/s
View Answer

Answer: a
Explanation: y=10sinπ(0.02x-2t)

7. If equation of a sound wave is
Then its wavelength will be __________
a) 0.1unit
b) 0.2units
c) 0.3unit
d) 2unit
View Answer

Answer: a
Explanation: y=0.0015sin⁡(62.8x+314t)
y=asin⁡(2π/ʎ x+2π/T t)
ʎ = (2×3.14)/62.8=0.1unit.

8. The plane wave is described by the equation
Where c is in meters and t in seconds. The maximum velocity of the particles of the medium due to this is?
a) 30m/s
b) 3π/2 m/s
c) 3/4 m/s
d) 40m/s
View Answer

Answer: a
Explanation: y=3cos⁡(x/4-10t-π/2)

9. The equation of wave is given by
If the displacement is 5cm at t=0, then the total phase at t=7.5s will be __________
a) π/3rad
b) π/2rad
c) 2π/5rad
d) 2π/3rad
View Answer

Answer: d
Explanation: y=10sin⁡(2πt/30+α)
At t=0, 5=10sinα or sin α=1/2
Total phase at t=7.5s,

10. If two sound waves having a phase difference of 60°, then they will have a path difference of __________
a) ʎ/6
b) ʎ/3
c) ʎ
d) 3ʎ
View Answer

Answer: a
Explanation: ∆φ=60°=π/3

Sanfoundry Global Education & Learning Series – Engineering Physics.

To practice all areas of Engineering Physics, here is complete set of 1000+ Multiple Choice Questions and Answers.

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Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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