Computer Knowledge

Computer Knowledge: Practice Questions with Answers

112 practice questions on Computer Knowledge, with answers; most also have an explanation or a worked solution. Try each one before you open its answer.

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1. Q.101

   In an email, what does 'BCC' stand for?

   1. A Blind Carbon Copy
   2. B Basic Carbon Copy
   3. C Bulk Carbon Copy
   4. D Blocked Carbon Copy
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   Correct answer: (A) Blind Carbon Copy

   BCC stands for Blind Carbon Copy - recipients in this field are hidden from all other recipients.

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2. Q.102

   ROM primarily stores which kind of data?

   1. A Permanent firmware/startup instructions
   2. B User documents
   3. C Temporary browser cache
   4. D Running application data
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   Correct answer: (A) Permanent firmware/startup instructions

   ROM (Read-Only Memory) is non-volatile and holds permanent instructions such as firmware, retained even without power.

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3. Q.103

   Which number system uses the digits 0-9 and the letters A-F?

   1. A Hexadecimal
   2. B Binary
   3. C Octal
   4. D Decimal
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   Correct answer: (A) Hexadecimal

   The hexadecimal (base-16) system uses the digits 0-9 followed by the letters A-F to represent values 10-15.

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4. Q.104

   PARAM, one of India's pioneering supercomputer series, was developed by which organisation?

   1. A C-DAC (Centre for Development of Advanced Computing)
   2. B ISRO
   3. C IIT Bombay
   4. D Tata Consultancy Services
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   Correct answer: (A) C-DAC (Centre for Development of Advanced Computing)

   The PARAM series of supercomputers, starting with PARAM 8000 in 1991, was developed by C-DAC (Centre for Development of Advanced Computing).

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5. Q.105

   What is the main function of a firewall?

   1. A Monitor and control incoming/outgoing network traffic based on security rules
   2. B Increase processor speed
   3. C Compress files to save space
   4. D Translate text between languages
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   Correct answer: (A) Monitor and control incoming/outgoing network traffic based on security rules

   A firewall monitors and filters network traffic based on predetermined security rules, blocking unauthorised access.

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6. Q.106

   Which of these is an example of an operating system?

   1. A Linux
   2. B Microsoft Word
   3. C Google Chrome
   4. D Adobe Photoshop
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   Correct answer: (A) Linux

   Linux is an operating system; Microsoft Word, Google Chrome and Adobe Photoshop are all application software that run on top of an operating system.

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7. Q.107

   Convert the hexadecimal number DC into decimal.

   1. A 236
   2. B 220
   3. C 219
   4. D 221
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   Correct answer: (B) 220

   Hexadecimal DC = decimal 220 (sum of each digit x 16^position, from the right starting at 16^0).

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8. Q.108

   Which printer type sprays tiny droplets of liquid ink onto paper and is commonly used for high-quality photo printing?

   1. A Inkjet printer
   2. B Laser printer
   3. C Dot-matrix printer
   4. D 3D printer
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   Correct answer: (A) Inkjet printer

   An Inkjet printer sprays microscopic ink droplets onto paper, producing high-quality output well suited to photo printing.

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9. Q.109

   Which type of malicious program can replicate itself and spread across a network without needing to attach itself to another program?

   1. A Worm
   2. B Trojan horse
   3. C Spyware
   4. D Adware
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   Correct answer: (A) Worm

   A worm is a standalone malicious program that self-replicates and spreads across networks, unlike a virus which needs a host program.

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10. Q.110

    What does FTP stand for?

    1. A File Transfer Protocol
    2. B Fast Transmission Protocol
    3. C File Transmission Path
    4. D Form Transfer Process
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    Correct answer: (A) File Transfer Protocol

    FTP stands for File Transfer Protocol, a standard network protocol used to transfer files between a client and a server.

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11. Q.111

    Which printer type uses heat to fuse toner powder onto paper, commonly used for fast, high-volume office printing?

    1. A Laser printer
    2. B Inkjet printer
    3. C Dot-matrix printer
    4. D Thermal printer
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    Correct answer: (A) Laser printer

    A Laser printer uses a laser and heat to fuse toner onto paper, making it fast and well suited to high-volume office printing.

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12. Q.112

    HDD and SSD are both types of which computer component?

    1. A Storage device
    2. B Input device
    3. C Output device
    4. D Processing unit
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    Correct answer: (A) Storage device

    HDD (Hard Disk Drive) and SSD (Solid State Drive) are both secondary storage devices used to permanently store data.

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