Computer Science: Unit-wise Objective Question Bank

Group A of the Grade 11 Computer Science paper is nine marks of multiple-choice items, one mark each. The paper is 2 hours and 50 marks, so nine marks is almost a fifth of it, and it is the part where a student who has read the book once can still score full marks in about ten minutes. Nothing is lost by a wrong answer, so never leave a bubble empty.

This chapter gives practice MCQs for all eight units of the Grade 11 syllabus, with an answer key and a one-line reason for every item, followed by a short study of how wrong options are built. The items test exactly what the matching chapter of the Computer Science textbook teaches.

14.1 How the nine marks are spread

The syllabus carries 80 theory hours, and the weighting by unit is a better guide to the nine marks than any rumour about "important" topics.

14.2 Unit 1: Computer System

1. The first generation of computers used [1]atransistorsbvacuum tubescintegrated circuitsdmicroprocessors
2. The Intel 4004, which began the fourth generation, was a [1]amicroprocessorbtransistorcvacuum tubedhard disk
3. The speed of a supercomputer is usually measured in [1]aMIPSbFLOPScbitsdbytes
4. How many bytes are there in 2 KB? [1]a1000b2000c2048d1024
5. Which of the following is the fastest memory in a computer? [1]ahard diskbRAMccache memorydDVD
6. Which memory loses its contents when the power is switched off? [1]aROMbRAMcEPROMdflash BIOS chip
7. Which bus is unidirectional, carrying the location of the memory cell to be read or written? [1]adata busbcontrol buscaddress busdexpansion bus
8. The unit of the microprocessor that performs arithmetic and logical operations is the [1]acontrol unitbALUcregisterdcache
9. Which device reads the pencil-filled bubbles on an objective answer sheet? [1]aOCRbOMRcMICRdBCR
10. The special ink characters printed on the bottom of a bank cheque are read by [1]aMICRbOMRclight pendscanner
11. Which printer forms characters by striking an inked ribbon with pins? [1]ainkjet printerblaser printercdot matrix printerdthermal plotter
12. Which port carries both digital video and audio in a single cable? [1]aparallel portbserial portcHDMIdPS/2
13. Which of the following is a mobile computing device? [1]amainframebsmartphonecdesktop towerdminicomputer
14. The number of bits a CPU can process at one time is called its [1]aclock speedbword lengthcbus widthdcache size
15. PROM, EPROM and EEPROM are types of [1]aRAMbROMccachedbuffer
16. Which of these is a secondary storage device? [1]aregisterbcachechard diskdROM

14.3 Unit 2: Number System and Boolean Logic

1. The decimal value of the binary number (1101)_2 is [1]a11b12c13d14
2. The binary equivalent of the decimal number 25 is [1]a10011b11001c11010d10101
3. The decimal value of the hexadecimal number (2F)_{16} is [1]a37b45c47d51
4. The octal number (17)_8 is equal to the decimal number [1]a15b16c17d7
5. (101)_2 + (11)_2 equals [1]a(110)_2b(111)_2c(1000)_2d(1001)_2
6. The 1's complement of 1010 is [1]a0101b0110c1011d1111
7. The 2's complement of 0101 (4 bits) is [1]a1010b1011c1001d0110
8. Which gate gives output 1 only when both inputs are 1? [1]aORbANDcNANDdXOR
9. Which gate gives output 1 only when its two inputs are different? [1]aXNORbNORcXORdAND
10. Which of the following gates is called a universal gate? [1]aANDbORcNANDdXOR
11. According to Boolean algebra, A + A' is equal to [1]a0b1cAdA'
12. A \cdot 0 is equal to [1]aAb1c0dA'
13. By De Morgan's theorem, (A + B)' equals [1]aA' + B'bA' \cdot B'cA \cdot BdA + B'
14. The number of rows in the truth table of a Boolean function of three variables is [1]a3b6c8d9
15. In the hexadecimal system, the symbol E represents the decimal value [1]a13b14c15d16

14.4 Unit 3: Computer Software and Operating System

1. Which of the following is system software? [1]aword processorboperating systemcweb browserdspreadsheet
2. A program that scans a computer for viruses and removes them is [1]autility softwarebapplication softwarecan assemblerda compiler
3. An operating system that keeps several programs in main memory and switches the CPU among them is called [1]amultiprogrammingbsingle-usercbatch onlydreal-time only
4. A computer with more than one CPU working together is a [1]amultiprocessing systembsingle-tasking systemcembedded systemdtime-sharing terminal
5. Which of the following is an open-source operating system? [1]aWindows 11bmacOScLinuxdiOS
6. Ubuntu, Fedora and Debian are examples of [1]aLinux distributionsbUNIX shellscmobile operating systemsdantivirus programs
7. Which of the following is a mobile operating system? [1]aAndroidbUbuntucMS-DOSdSolaris
8. Which of the following is NOT a function of an operating system? [1]amemory managementbfile managementcdesigning web pagesddevice management
9. In Windows, which tool is used to browse, copy, move and delete files and folders? [1]aFile ExplorerbNotepadcPaintdCalculator
10. The kernel of Linux was first written by [1]aBill GatesbDennis RitchiecLinus TorvaldsdSteve Jobs
11. A system in which many computers connected by a network work together as one is called a [1]adistributed systembstandalone systemcbatch systemdpalmtop
12. Software that is downloaded and run through a web browser, without installing it, is called [1]autility softwarebweb-based applicationcsystem softwaredfirmware

14.5 Unit 4: Application Package

1. Which package is used to prepare a letter or a report? [1]aspreadsheetbword processorcDBMSdpresentation tool
2. Which package is best for calculating and analysing marks in rows and columns, with formulas and charts? [1]aspreadsheetbword processorcbrowserdcompiler
3. Microsoft PowerPoint is an example of a [1]apresentation toolbspreadsheetcDBMSdoperating system
4. Microsoft Access is an example of a [1]aword processorbspreadsheetcdatabase management systemdweb browser
5. Software that keeps the stock, purchases and sales records of a shop is a [1]apayroll systembweather forecasting systemcinventory management systemdhotel management system
6. Software that calculates salary, tax and allowances of employees is a [1]apayroll systembschool management systemcinventory systemdhotel system

14.6 Unit 5: Programming Concepts and Logics

These items include output questions. Each program was compiled and run with gcc; the stated answer is the output.

1. A translator that converts the whole source program into machine code before execution is a [1]acompilerbinterpretercassemblerdeditor
2. A translator that converts assembly language into machine language is [1]aan assemblerba compilercan interpreterda linker
3. An error caused by wrongly written program statements, such as a missing semicolon, is a [1]asyntax errorbruntime errorclogical errordsemantic error
4. Division by zero during execution is an example of a [1]asyntax errorbruntime errorccompile-time errordtyping error
5. The ASCII code of the capital letter A is [1]a48b65c97d66
6. Which code can represent the characters of all the languages of the world? [1]aASCIIbBCDcUnicodedabsolute binary
7. Which header file must be included to use printf() and scanf()? [1]aconio.hbstdio.hcstring.hdmath.h
8. What is the output of printf("%d", 7 / 2);? [1]a3.5b4c3d3.0
9. What is the output of printf("%d", 17 % 5);? [1]a3b2c3.4d5
10. What are the values of x and y after int x = 5; int y = x++;? [1]ax = 5, y = 5bx = 6, y = 5cx = 6, y = 6dx = 5, y = 6
11. What is printed by int a = 4; a *= 3 + 2; printf("%d", a);? [1]a14b20c12d10
12. What is the output of printf("%d", 5 > 3 && 2 > 4);? [1]a1b0c5d2
13. What is the output of int i, s = 0; for (i = 1; i <= 4; i++) s += i; printf("%d", s);? [1]a4b6c10d24
14. How many times is the loop body executed: int i = 5; do { i--; } while (i > 7);? [1]a0b1c2dinfinite
15. What is printed by int n = 2; switch (n) { case 1: printf("A"); case 2: printf("B"); case 3: printf("C"); break; default: printf("D"); }? [1]aBbBCcBCDdABC
16. What is the output of int a[5] = {2, 4, 6, 8, 10}; printf("%d", a[1] + a[3]);? [1]a6b10c12d14
17. What is the output of printf("%d", strlen("NEPAL"));? [1]a4b5c6d0
18. What is the output of float f = 5 / 2; printf("%.1f", f);? [1]a2.5b2.0c3.0d2
19. Which of the following is a valid identifier in C? [1]a2marksbtotal-marksctotal_marksdint
20. Which control structure is used to repeat a block of statements? [1]asequencebselectionciterationddeclaration

14.7 Unit 6: Web Technology I

1. HTML stands for [1]aHyper Text Markup LanguagebHigh Text Machine LanguagecHyper Transfer Markup LanguagedHome Tool Markup Language
2. Which tag does not need a closing tag? [1]a<p>b<b>c<br>d<title>
3. Which heading tag gives the largest text? [1]a<h6>b<h3>c<h1>d<head>
4. Which tag creates a hyperlink? [1]a<link>b<a>c<href>d<url>
5. Which attribute of <a> gives the address of the target page? [1]asrcbhrefcaltdname
6. Which tag is used for a table header cell? [1]a<td>b<tr>c<th>d<thead>
7. Which attribute makes an ordered list count with lower-case letters? [1]atype="a"btype="A"ctype="1"dtype="i"
8. Which HTML5 element is used to play a video file? [1]a<movie>b<media>c<video>d<play>
9. Which HTML5 element provides a drawing surface that is drawn on with JavaScript? [1]a<canvas>b<svg>c<draw>d<paint>
10. Which form control accepts several lines of text? [1]a<input type="text">b<textarea>c<input type="radio">d<select>
11. Which type of CSS is written directly in the style attribute of a tag? [1]ainline CSSbembedded CSScexternal CSSdimported CSS
12. Where is embedded CSS written? [1]ain a .css filebin a <style> tag in the headcin the tag's attributedin the <footer>
13. Which tag writes text as superscript, as in x²? [1]a<sub>b<sup>c<super>d<small>
14. A software system that lets users create, edit and manage web content without coding is a [1]aCMSbcompilercDBMSdrouter
15. In <body bgcolor="yellow">, bgcolor is a(n) [1]atagbattributecelementdcomment

14.8 Unit 7: Multimedia

1. Which of the following is NOT a component of multimedia? [1]atextbaudiocanimationdprinter
2. A sequence of still pictures shown quickly to create the illusion of motion is [1]aanimationbaudioctextdhypertext
3. Which file type holds compressed music? [1]aMP3bJPEGcDOCdPDF
4. Multimedia that lets the user control what is shown next, as in an educational game, is called [1]alinear multimediabinteractive multimediacprinted mediadanalog media
5. Which of these is a graphics file format? [1]aWAVbMP4cPNGdTXT
6. In which field is multimedia used for virtual classrooms and e-learning? [1]aeducationbmining onlycfarming onlydplumbing

14.9 Unit 8: Information Security and Cyber Law

1. A program that replicates by attaching itself to other files is a [1]avirusbfirewallcbrowserdcookie
2. A malicious program that spreads on its own across a network without needing a host file is a [1]awormbtrojan horsecboot diskdpatch
3. Software that pretends to be useful but secretly harms the system is a [1]aTrojan horsebsharewarecfreewaredutility
4. Unwanted bulk email is called [1]aspambphishingccookiedcache
5. Tricking users by a fake website or message to reveal passwords or bank details is called [1]aphishingbformattingcdefragmentingdcropping
6. Software that demands money to restore access to locked files is [1]aransomwarebadwarecfreewaredmiddleware
7. The legal right given to the creator of a book, program or song is [1]acopyrightbtrademarkcdomain namedlicence key
8. The right that protects a brand name or logo is [1]acopyrightbtrademarkcpatentdcookie
9. A digital signature is used to [1]acheck the identity of the sender and the integrity of a messagebcompress a filecprint a documentdincrease internet speed
10. Nepal's principal cyber law is the [1]aElectronic Transactions Act, 2063bCopyright Act onlycEducation ActdPress Council Act
11. A hardware or software barrier that filters traffic between a network and the internet is a [1]afirewallbrouter tableccookiedhub
12. Using someone else's computer or account without permission is [1]ahackingbformattingcbackupdbooting

14.10 Distractor analysis: how wrong options are built

A Group A question has one right option and three wrong ones, and the wrong ones are not random. Learning the four common builds lets you eliminate options even when you are unsure of the answer.

Practice questions

Group A: Multiple choice (1 mark each)

1. The generation of computers that used integrated circuits is the [1]afirstbsecondcthirddfifth
2. Which of the following is the smallest unit of storage? [1]abytebbitcnibbledword
3. What is the output of printf("%d", 20 / 6 + 20 % 6);? [1]a5b3c6d8
4. Which HTML tag marks the start of the visible content of a web page? [1]a<head>b<title>c<body>d<html>

Group B: Short answer (5 marks each)

1. Write the difference between RAM and ROM. Give any three points. [5]
2. Convert (110101)_2 to decimal and (53)_{10} to binary. [5]
3. Differentiate between a compiler and an interpreter. [5]
4. What is a Trojan horse? State how it differs from a worm. [5]

Group C: Long answer (8 marks each)

1. Draw the truth table of the XOR gate with its Boolean expression, and prove A + AB = A using a truth table. [8]
2. Write a C program to read a number and print whether it is positive, negative or zero, then print the sum of the first n natural numbers using a loop. [8]

#include <stdio.h>
int main() {
    int n, i, sum = 0;
    printf("Enter a number: ");
    scanf("%d", &n);
    if (n > 0)
        printf("Positive\n");
    else if (n < 0)
        printf("Negative\n");
    else
        printf("Zero\n");
    for (i = 1; i <= n; i++)
        sum = sum + i;
    printf("Sum of first %d natural numbers = %d\n", n, sum);
    return 0;
}