laboursonline – MCQs, Mock Tests | Electrical engineering Audio Video Engineering MCQs set -2

A loud sound is about how many times greater than that of the weakest sounds?

1. Penta
2. Hexa
3. Tera
4. Quadra

✅ Correct Answer: 3

What is the complete audible range for a human ear?

1. 20 to 25,000 HZ
2. 30 to 30,000 HZ
3. 20 to 20,000 HZ
4. 60 to 60,000 HZ

✅ Correct Answer: 3

How many Hertz do healthy young people usually hear?

1. 6-7 KHz
2. 1-2 KHz
3. 13-14 KHz
4. 17-18 KHz

✅ Correct Answer: 4

Above how many KHz men and women can’t hear by the age of 55?

1. 5, 12
2. 12, 5
3. 9, 14
4. 14, 9

✅ Correct Answer: 1

What is most sensitive to frequencies in the range of 2,000-5,000 Hz?

1. Cochlea
2. Pinna
3. Human ear
4. Auditory nerve

✅ Correct Answer: 3

Which scale is used to perceive the loudness of sounds?

1. Decibel
2. Celsius
3. Kelvin
4. Rankine

✅ Correct Answer: 1

What does the outer ear act like?

1. Tunnel
2. Funnel
3. Canal
4. Waves

✅ Correct Answer: 2

Which of the following separates the outer ear from the middle ear?

1. Ear canal
2. Pinna
3. Auditory nerve
4. Eardrum

✅ Correct Answer: 4

Which tube connects the middle ear with the mouth?

1. Eardrum
2. Eustachian
3. Ear canal
4. Fallopian

✅ Correct Answer: 2

What does MP3 stands for?

1. MPEG audio layer 3
2. MKV video layer 3
3. MPEG video layer 3
4. JPEG audio layer 3

✅ Correct Answer: 1

In which year the first MP3 player was introduced?

1. 1987
2. 1975
3. 1998
4. 1945

✅ Correct Answer: 3

Which of the following does the overall functions like controlling the MP3 files reading from the memory and applying them to audio codec and controlling playback process from control keys?

1. MCU
2. USB
3. MPMan
4. AM tuner

✅ Correct Answer: 1

What is the device called that can hold digital audio files on internal or external media in USB MP3 players?

1. Solid state
2. Liquid state
3. Gaseous state
4. Mixed state

✅ Correct Answer: 1

Which device is the best example for the device that can read digital audio files from a hard drive?

1. Apple’s iPod
2. Radio
3. Television
4. Pen drive

✅ Correct Answer: 1

Which player dominates the music media market?

1. Transistor radio
2. DVD
3. MP3
4. CD

✅ Correct Answer: 3

What is termed as a network which is used to divide the input signal into separate frequency ranges for each speaker?

1. Multi-way speaker
2. Crossover network
3. Optical recording
4. Bilateral network

✅ Correct Answer: 2

What is termed as the point where the curve of woofer output crosses the curve of tweeter output?

1. Crossover amplitude
2. Crossover phase
3. Crossover frequency
4. Crossover cycle

✅ Correct Answer: 3

What is the range of woofer for 3 way speaker system?

1. 20 Hz to 500 Hz
2. 50 Hz to 5000 Hz
3. 2000 Hz to 5000 Hz
4. 500 Hz to 5000 Hz

✅ Correct Answer: 1

What is the range of tweeter for 3 way speaker system?

1. 2000 Hz to 5000 Hz
2. 5000 Hz to 20,000 Hz
3. 500 Hz to 5000 Hz
4. 20 Hz to 500 Hz

✅ Correct Answer: 2

Design a crossover network to give 12 dB per octave attenuation for critical frequency of 0.5 KHz. Loudspeaker is having resistance of 8 Ω.

1. C = 200 μF, L = 5.9 mH
2. C = 28.13 μF, L = 3.6 mH
3. C = 45.78 μF, L = 2.9 mH
4. C = 67.34 μF, L = 9.9 mH

✅ Correct Answer: 2

With which material is a photographic film strip coated on one side of photographic film in optical recording of sound?

1. Silver halide crystals
2. Silver chlorine crystals
3. Silver iodide crystals
4. Silver bromide crystals

✅ Correct Answer: 1

By converting which signals into variations of light intensity falling onto the film is recording on photographic film donein optical recording of sound?

1. Video
2. Audio
3. Both video and audio
4. Transmission

✅ Correct Answer: 2

What is a small, portable and round medium made of molded polymer for electronically recording, storing, and playing back audio, video, text and other information in digital form in optical recording of sound?

1. CD
2. DVD
3. Audio player
4. Video Player

✅ Correct Answer: 1

Up to how many minutes a standard compact disc can hold up in optical recording of disc?

1. 50
2. 60
3. 70
4. 80

✅ Correct Answer: 4

Which surface of a CD is covered with microscopic bumps called ‘pits’ and ‘lands’ in optical recording of disc?

1. Lower
2. Upper
3. Front
4. Back

✅ Correct Answer: 1

Which two companies were pioneers in developing projects to record sound in digital form which give birth to the compact disc system in October 1982?

1. Philips and Sony
2. Dell and HP
3. Acer and HP
4. Sony and Intel

✅ Correct Answer: 1

What will be the length of a track of data if it is stretched out in a CD in optical recording of disc?

1. 15 KM
2. 5 KM
3. 4 KM
4. 35 KM

✅ Correct Answer: 2

How many discs can be made from a master disc in optical recording of disc?

1. Singles
2. Hundreds
3. Thousands
4. Millions

✅ Correct Answer: 4

Which discs are virtually extinct now and have been replaced by compact discs (CDs) since many years due to numerous advantages they offer?

1. Gramophone discs (LPs)
2. Flutter discs
3. Dynamic discs
4. Blu-ray discs

✅ Correct Answer: 1

Up to how many GB the disc storage is expanded per layer in Blu-ray technology?

1. 10
2. 15
3. 5
4. 25

✅ Correct Answer: 4

Which video quality is the Blu-ray disc capable of storing?

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

✅ Correct Answer: 4

What can be downloaded instantly from the internet with the help of Blu-ray disc?

1. Audio
2. Video
3. Subtitles
4. Both audio and video

✅ Correct Answer: 3

What is the data transfer rate in Blu-ray discs?

1. 36 Mbps
2. 56 Mbps
3. 78 Mbps
4. 63 Mbps

✅ Correct Answer: 1

What can be termed as falsified reproduction of an audio signal caused by change in the waveform of the original signal?

1. Distortion
2. Frequency
3. Amplitude
4. Phase

✅ Correct Answer: 1

By using which technology home stereo system remains the best way to listen to recorded music?

1. Low fidelity
2. High fidelity
3. Blu-ray disc
4. DVDs

✅ Correct Answer: 2

At which frequency response can one be proud of listening to a Hi-fi music system?

1. 30-15,000 Hz
2. 120-15,000 Hz
3. 90-15,000 Hz
4. 30-50,000 Hz

✅ Correct Answer: 1

Which type of sound is produced in a closed room?

1. Direct, reflected and reverberant
2. Direct, refracted and reverberation
3. Indirect, refracted and reverberant
4. Indirect and reverberant

✅ Correct Answer: 1

What is the full form of PA system in audio devices?

1. Public address
2. Phase action
3. Power action
4. Public action

✅ Correct Answer: 1

To which stage is the output of microphone fed in PA system?

1. Voltage amplifier
2. Loudspeaker
3. Power amplifier
4. Mixer

✅ Correct Answer: 4

How many types of mixers are there in a PA system in audio devices?

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

✅ Correct Answer: 2

Which gain control is used in processing circuit in PA system in audio devices?

1. Master
2. Slave
3. Key
4. Optical

✅ Correct Answer: 1

Which amplifier uses push-pull type amplifier circuit in PA system?

1. Power amplifier
2. Voltage amplifier
3. Driver amplifier
4. Frequency amplifier

✅ Correct Answer: 1

Which of the following convert electrical signals into pressure variations resulting in sound waves in PA system?

1. Mixer
2. Microphone
3. Loudspeaker
4. Driver

✅ Correct Answer: 3

How is the sound power distributed amongst the audience to achieve uniformity in PA system?

1. More loud speakers in listener’s area
2. 1 or 2 loudspeaker near a stage
3. 3 or 4 loudspeaker near a stage
4. More loud speakers in listener’s area

✅ Correct Answer: 1

Which type of microphone does not pick up reflected sound as well as the sound waves from the loudspeakers in PA system?

1. Electret
2. Moving coil
3. Ribbon
4. Cardioid

✅ Correct Answer: 4

What is termed as the persistence of sound even after the source of sound has stopped producing sound?

1. Acoustic reverberation
2. Time reverberation
3. Echo reverberation
4. Audio amplifier

✅ Correct Answer: 1

What is defined as the time for the acoustic intensity to decrease by a factor of one million?

1. Acoustic reverberation
2. Echo reverberation
3. Reverberation time
4. Audio amplifier

✅ Correct Answer: 3

What is the sound pressure level of a loud clap?

1. 100 dB
2. 40 dB
3. 10 dB
4. 500 dB

✅ Correct Answer: 1

Which of the following have short reverberation time?

1. Empty room
2. Unfurnished room
3. Cinemas
4. Empty playground

✅ Correct Answer: 3

What is the interval when a sound is reflected back from a distant object and hits our ears?

1. 0.1 second
2. 0.8 seconds
3. 0.4 seconds
4. 0.5 seconds

✅ Correct Answer: 1