alleryStart learning →What does an optical drive use to read a disc?
- A magnet
- A laser
- A fan
- A needle
Show answer and solution
Correct answer: B. A laser
A laser diode lights up the disc surface and the reflection is read.
Olympiad (Class 5) Computer fundamentals and storage devices — practice questions — page 2
Explore 54 free Computer fundamentals and storage devices questions in Olympiad (Class 5) Computer Science. Open each question or exercise to read its content, reference answers and available explanation.
Practise Computer fundamentals and storage devices with Quill →Computer fundamentals and storage devices questions and exercises with answers
Showing questions 31–54 of 54.
What does an optical drive use to read a disc?Read the answer and worked solution →Which disc can be written only once?Read the answer and worked solution →Which disc type is read-only and used to distribute music or programs?Read the answer and worked solution →Which disc can be erased and written again?Read the answer and worked solution →Which storage uses memory chips with no moving parts, like those in a pen drive?Read the answer and worked solution →What is the main store used by modern computers for primary storage?Read the answer and worked solution →Early punched cards and paper tape stored data in what way?Read the answer and worked solution →Which old storage used sound waves in mercury to store information?Read the answer and worked solution →Which future-style storage keeps digital information in DNA?Read the answer and worked solution →What is the main job of the BIOS program when a PC is switched on?Read the answer and worked solution →Which part is the main board that joins the CPU, RAM and disk drives together?Read the answer and worked solution →The CPU is often described as what part of the computer?Read the answer and worked solution →Which part encloses and protects the motherboard and disk drives of a desktop?Read the answer and worked solution →What does a PC power supply unit do to the power from a wall outlet?Read the answer and worked solution →Which battery keeps the date and time when a computer is off?Read the answer and worked solution →Which common port connects a pen drive or mouse to a computer?Read the answer and worked solution →Physical parts you can touch are called hardware. What are the instructions called?Read the answer and worked solution →Which of these is software, not hardware?Read the answer and worked solution →What is the defining feature that sets modern computers apart from other machines?Read the answer and worked solution →Each memory cell has a number used to find it. What is that number called?Read the answer and worked solution →What does the CPU's program counter keep track of?Read the answer and worked solution →Modern CPUs are built on a single chip. What is such a CPU called?Read the answer and worked solution →Compared with main memory, registers inside the CPU are what?Read the answer and worked solution →A chip with millions of tiny cells that keeps data electronically is what kind of memory?Read the answer and worked solution →
Worked practice questions
Which disc can be written only once?
- DVD-RAM
- CD-RW
- CD-R
- CD-ROM
Show answer and solution
Correct answer: C. CD-R
CD-R, DVD-R and BD-R are write-once media.
Which disc type is read-only and used to distribute music or programs?
- CD-ROM
- CD-R
- CD-RW
- DVD-RAM
Show answer and solution
Correct answer: A. CD-ROM
CD-ROM is read-only storage used for mass distribution of music, video and programs.
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