In MP3 compression scheme, 60 minutes of music can be stored in about:
- A.600 MB
- B.200 MB
- C.50 MB
- D.10 MB
Correct answer
Explanation
The correct answer is C, 50 MB. At the common MP3 bit rate of 128 kilobits per second, one hour of music takes roughly 55 to 60 megabytes, so about 50 MB is the closest figure.
MP3 is a lossy audio format that removes sounds the human ear barely notices. The working is simple: 128,000 bits per second multiplied by 3,600 seconds gives about 460 million bits, and dividing by 8 gives about 57.6 million bytes. The same hour stored as uncompressed CD-quality audio needs about 600 MB, so MP3 shrinks music roughly ten to twelve times.
A, 600 MB, is the size of one hour of uncompressed CD audio, not MP3. B, 200 MB, is far more than a normal MP3 needs even at high bit rates. D, 10 MB, holds only about ten minutes of music at the usual MP3 bit rate.
Exam tip: one minute of MP3 at 128 kbps is about 1 MB, while one hour of CD audio is about 600 MB.
Practice Questions
View allWith reference to communication technologies, what is/are the difference/differences between LTE (Long-Term Evolution) and VoLTE (Voice over Long-Term Evolution)? 1. LTE is commonly marketed as 3G and VoLTE is commonly marketed as advanced 3G. 2. LTE is data-only technology and VoLTE is voice-only technology. Select the correct answer using the code given below.
- A.1 only
- B.2 only
- C.Both 1 and 2
- D.Neither 1 nor 2
Show answer
Neither statement describes the real difference between the two. LTE is a fourth-generation mobile broadband standard and is sold to customers as 4G, not 3G. VoLTE is not a separate network at all: it is a way of carrying voice calls as data packets over that same LTE network, using…
Read the full explanation →1 gigabyte in binary system is equivalent to
- A.1000 kilobytes
- B.1024 megabytes
- C.1200 megabytes
- D.10000 kilobytes
Show answer
In the binary system every step up the ladder of memory units is a factor of 2 raised to 10, that is 1024, so one gigabyte holds 1024 megabytes.
Read the full explanation →Consider the following:
1. Small memory
2. Less expensive memory
3. Fast memory
Which of the above are the characteristics of the cache memory?
- A.1 and 2 only
- B.2 and 3 only
- C.1 and 3 only
- D.1, 2 and 3
Show answer
Cache memory is small and very fast, but it is the most expensive memory per byte after the CPU registers, so statement 2 is wrong.
Read the full explanation →What is the correct term used for a set of wires used to connect different internal components of the computer system for the purpose of transferring data as well as addresses amongst them?
- A.Hub
- B.Port
- C.Router
- D.Bus
Show answer
A bus is the shared set of electrical lines on the motherboard that carries data, addresses and control signals between the CPU, memory and input-output devices.
Read the full explanation →Which one of the following is an application of Artificial Intelligence?
- A.Database management system
- B.Operating system
- C.Natural language processing
- D.Register
Show answer
NLP is the branch of artificial intelligence that lets computers understand, interpret and produce human language. Artificial intelligence covers systems that perform tasks normally needing human intelligence, such as learning, reasoning and understanding speech or text.
Read the full explanation →