laboursonline – MCQs, Mock Tests | Electrical engineering Audio Video Engineering MCQs set -1

What is the dimension of sound waves in the real world?

1. One-dimensional
2. Two-dimensional
3. Three-dimensional
4. Four-dimensional

✅ Correct Answer: 3

As sound requires a medium, it cannot travel through which of the following?

1. Glass
2. Air
3. Vacuum
4. Water

✅ Correct Answer: 3

What is the effect called in which each single molecule only moves a small distance as it vibrates, and it causes the nearby molecules to vibrate all the way to the ear?

1. Spectral effect
2. Dynamic effect
3. Domino effect
4. Modulation effect

✅ Correct Answer: 3

Which of the following has all the characteristics of a wave like amplitude, frequency, wavelength, phase and velocity?

1. Sound
2. Intensity
3. Air
4. Energy

✅ Correct Answer: 1

What is the sound motion curves called?

1. Frequency
2. Cycle
3. Overtone
4. Waveform

✅ Correct Answer: 4

How do sound waves travel from the point of source?

1. Spherical waves
2. Oval waves
3. Sinewaves
4. Cos waves

✅ Correct Answer: 1

What can be termed as the intensity of compressions and rarefaction produced in the medium?

1. Frequency
2. Cycle
3. Wavelength
4. Amplitude

✅ Correct Answer: 4

What is termed as a pattern which repeats itself over time?

1. Wavelength
2. Frequency
3. Amplitude
4. Periodic Vibration

✅ Correct Answer: 4

What is termed as one repetition of the pattern?

1. Velocity
2. Cycle
3. Frequency
4. Wavelength

✅ Correct Answer: 2

What is termed as time required to complete one cycle of vibration?

1. Amplitude
2. Wavelength
3. Period
4. Cycle

✅ Correct Answer: 3

What can be expressed as distance travelled in one second?

1. Phase
2. Velocity
3. Period
4. Wavelength

✅ Correct Answer: 2

What is the velocity at 0° C?

1. 331 m/s
2. 339 m/s
3. 351 m/s
4. 431 m/s

✅ Correct Answer: 1

What is termed as the amount of sound energy that is reflected off a surface?

1. Reflection
2. Refraction
3. Diffraction
4. Frequency

✅ Correct Answer: 1

What causes reverberation?

1. Diffraction
2. Frequency
3. Reflection
4. Refraction

✅ Correct Answer: 3

What can occur when the speed of a wave changes, as it moves from one environment to another?

1. Reflection
2. Diffraction
3. Frequency
4. Refraction

✅ Correct Answer: 4

What is caused by bending across obstacles in sound waves?

1. Diffraction
2. Reflection
3. Frequency
4. Refraction

✅ Correct Answer: 1

Which audio frequencies have smaller wavelength and suffer less diffraction?

1. Low
2. High
3. Medium
4. Low and High

✅ Correct Answer: 2

Which resonator is a container/bottle of gas with an open hole?

1. Helmholtz
2. Coaxial
3. Dielectric
4. Crystal

✅ Correct Answer: 1

By which formula the resonant frequency is determined?

1. f = c/2π√B/VS Hz
2. f = c/5π√A/VL Hz
3. f = c/2π√A/VL Hz
4. f = c/3π√A/VS Hz

✅ Correct Answer: 3

Which resonant frequencies can be obtained with Helmholtz resonator?

1. Low
2. High
3. Medium
4. Low and High

✅ Correct Answer: 1

Which is one of the most common applications of Helmholtz resonator?

1. Woofer
2. Subwoofer
3. Reflection
4. Diffraction

✅ Correct Answer: 2

In which instruments Helmholtz resonators also important?

1. Stringed
2. Woodwind
3. Brass
4. Keyboard

✅ Correct Answer: 1

What is disturbed at the opening of Helmholtz resonator that bounces like a mass on a spring in simple harmonic motion which creates sound?

1. Air
2. Water
3. Sound
4. Frequency

✅ Correct Answer: 1

What can be termed as the sensation of a frequency?

1. Interval
2. Octaves
3. Harmonic
4. Pitch

✅ Correct Answer: 4

What is the standard pitch of a human ear?

1. 220 Hz
2. 600 Hz
3. 20 Hz
4. 440 Hz

✅ Correct Answer: 4

Who is capable of detecting a difference in frequency between two separate sounds that is as little as 2 Hz?

1. Young
2. Old
3. Musically trained
4. Infants

✅ Correct Answer: 3

Which change is insensitive to a human ear?

1. Phase
2. Velocity
3. Timbre
4. Overtones

✅ Correct Answer: 1

How many set of frequencies comprise the spectrum?

1. 1
2. 2
3. 3
4. 4

✅ Correct Answer: 3

What can be termed as frequencies higher than the fundamental frequencies?

1. Overtones
2. Timbre
3. Pitch
4. Frequency

✅ Correct Answer: 1

What makes two musical instruments sound different when they are playing the same note?

1. Overtones
2. Timbre
3. Frequency
4. Pitch

✅ Correct Answer: 2

Which of the following sounds are considered inharmonic?

1. Thunder and splattering of rain
2. Thunder and trumpet
3. Saxophone and trumpet
4. Trumpet and flute

✅ Correct Answer: 1

Which of the following sounds are considered harmonic?

1. Thunder and splattering of rain
2. Flute and trumpet
3. Thunder and trumpet
4. Thunder and saxophone

✅ Correct Answer: 2

Which sounds are generally pitched regarding human speech?

1. Vowels
2. Consonants
3. Amplitude
4. Resonant

✅ Correct Answer: 1

What is the interval between 400 Hz and 100 Hz?

1. 4
2. 16
3. 40,000
4. 128

✅ Correct Answer: 1

How many bones does middle ear have?

1. 1
2. 2
3. 3
4. 4

✅ Correct Answer: 3

What does the bones in the ear act like?

1. Audio amplifier
2. Video amplifier
3. Radio amplifier
4. Ultrasonic amplifier

✅ Correct Answer: 1

Which of the following is the fluid-filled tube present in the inner ear?

1. Cochlea
2. Pinna
3. Auditory nerve
4. Fallopian

✅ Correct Answer: 1

Which age group of people can hear the frequencies above 20,000 Hz?

1. 70-80 years
2. 65-75 years
3. Young
4. 55-65 years

✅ Correct Answer: 3

What is the full form of Hi – Fi?

1. Highest fidelity
2. High fidelity
3. Huge fidelity
4. High frequency

✅ Correct Answer: 2

What is the required frequency range for Hi-Fi programs?

1. 80 Hz to 5 KHz
2. 40 Hz to 15 KHz
3. 60 Hz to 55 KHz
4. 8 Hz to 66 KHz

✅ Correct Answer: 2

What is the required frequency range for normal entertainment programs?

1. 80 Hz to 5 KHz
2. 40 Hz to 15 KHz
3. 60 Hz to 55 KHz
4. 8 Hz to 66 KHz

✅ Correct Answer: 1

How much times greater is the threshold of pain corresponding to pressure amplitude of the atmospheric pressure?

1. 10 million
2. 1 billion
3. 1 trillion
4. 1 million

✅ Correct Answer: 4

Which scale is often convenient to measure sound pressures on a logarithmic scale?

1. Amplitude
2. Decibel
3. Threshold
4. Temperature

✅ Correct Answer: 2

At what sound pressure is the pain felt?

1. 53 Pa
2. 63 Pa
3. 73 Pa
4. 103 Pa

✅ Correct Answer: 2

What is the unit of loudness level for pure tone?

1. Decibel
2. Velocity
3. Phon
4. Wavelength

✅ Correct Answer: 3

What is the newer unit of loudness and is now the international standard?

1. Phon
2. Sone
3. Decibel
4. Frequency

✅ Correct Answer: 2

How much phons is equal to 1 sone?

1. 10
2. 20
3. 30
4. 40

✅ Correct Answer: 4

What is the full form of SPL?

1. Signal Pressure Level
2. Sound Pressure Level
3. Signal Phase Level
4. Sound Periodic Level

✅ Correct Answer: 2

What is called as the sound power per unit area?

1. Sound intensity
2. Sound pressure
3. Sound amplitude
4. Sound velocity

✅ Correct Answer: 1

Two sounds have levels of 80 dB and 100 dB. What is the difference in sound intensities?

1. 50
2. 100
3. 200
4. 1000

✅ Correct Answer: 2