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

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

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

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

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

Explanation: ʎ=100m, v=25m/s
T=ʎ/v=100/25=4s.
Note: Join free Sanfoundry classes at Telegram or Youtube

6. A transverse wave passes through a string with the equation
y=10sinπ(0.02x-2t)
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

Explanation: y=10sinπ(0.02x-2t)
u=dy/dt=-20πcosπ(0.02x-2t)
umax=20π=63m/s.

7. If equation of a sound wave is
y=0.0015sin⁡(62.8x+314t)
Then its wavelength will be __________
a) 0.1unit
b) 0.2units
c) 0.3unit
d) 2unit

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

8. The plane wave is described by the equation
y=3cos⁡(x/4-10t-π/2),
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

Explanation: y=3cos⁡(x/4-10t-π/2)
u=dy/dt=30sin⁡(x/4-10t-π/2)
umax=30m/s.

9. The equation of wave is given by
y=10sin⁡(2πt/30+α)
If the displacement is 5cm at t=0, then the total phase at t=7.5s will be __________

Explanation: y=10sin⁡(2πt/30+α)
At t=0, 5=10sinα or sin α=1/2
α=π/6
Total phase at t=7.5s,
φ=(2π×7.5)/300+π/6=π/2+π/6=2π/3.

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

Explanation: ∆φ=60°=π/3
∆x=ʎ/2π×∆φ=ʎ/2π×π/3=ʎ/6.

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.

If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]