NEB Class 11 · Past paper
The complete NEB Class 11 2070 exam paper for Computer Science, all 15 questions with solved model answers.
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Explain different types of programming languages with their merits and demerits. [10]
A programming language is a set of symbols, words and rules used to instruct a computer to perform tasks. Programming languages are broadly classified into low level and high level languages. 1. Machine level language (first generation) ...
What is logic gate? Describe any four logic gates with truth table and gate symbol. [2+8]
A logic gate is a basic electronic circuit that performs a logical operation on one or more binary inputs and produces a single binary output ($0$ or $1$). Gates are the building blocks of all digital circuits. 1. AND gate - output is
What is computer architecture and computer organization? Describe the different units of computer system. [2+8]
Computer architecture refers to the design and the attributes of a computer system that are visible to a programmer, such as the instruction set, addressing modes, data types and the logical design (the what and why). Computer organizati...
What is an operating system? Explain the types of operating system. [2+8]
An operating system (OS) is system software that acts as an interface between the user and the computer hardware. It manages hardware and software resources and provides an environment in which application programs can run. Examples: Win...
What is number system? Convert (111111)2 binary number into octal number. [1+4]
A number system is a way of representing numbers using a fixed set of digits and a base (radix). The common systems are binary (base 2), octal (base 8), decimal (base 10) and hexadecimal (base 16). Conversion of $(111111)2$ to octal: Gro...
What is memory? Differentiate between SRAM and DRAM. [1+4]
Memory is the part of a computer that stores data, instructions and results either temporarily or permanently so that they can be processed and retrieved when needed. Difference between SRAM and DRAM: SRAM (Static RAM) DRAM (Dynamic RAM)...
Explain the importance of mobile computing. [5] OR Differentiate between analog and digital computer. [5]
Importance of mobile computing: Mobile computing is the technology that allows transmission of data, voice and video through a computer or any wireless device without connecting to a fixed physical link. - Mobility: users can access info...
Describe algorithm and flowchart with examples. [5]
An algorithm is a finite, step by step, ordered set of well defined instructions to solve a given problem. It is written in simple English and is independent of any programming language. Example - algorithm to find the sum of two numbers...
What is an application program? List the major features of application program. [1+4]
An application program is software designed to help the user perform specific real world tasks such as writing documents, preparing spreadsheets, editing images or playing games. Examples: MS-Word, MS-Excel, Photoshop. Major features of ...
Differentiate between second and third generation computer. [5]
Difference between second and third generation computers: Second generation (1959-1965) Third generation (1965-1971) ------ Used transistors as the main electronic component Used integrated circuits (ICs) Larger in size than third genera...
What is HTML? Describe the objectives of HTML. [1+4] OR Describe the features of DBMS. [5]
HTML (HyperText Markup Language) is the standard markup language used to create and design web pages. It uses tags (e.g. <html, <body, <p) to define the structure and content of a page displayed in a web browser. Objectives of HTML: - To...
Subtract (111)2 from (1000)2 using 1's and 2's complement methods. [2.5+2.5]
We compute $(1000)2 - (111)2$. Aligning to 4 bits, the subtrahend is $0111$. Using 1's complement method: 1's complement of $0111$ is $1000$. Add it to the minuend: $$ \begin{aligned} & \ \ 1000 \ +,& \ \ 1000 \ \hline & 1,0000 \end{...
Describe the Non-Impact printers with examples. [5]
A non-impact printer prints characters and images without the print head physically striking the paper. Instead it uses heat, laser beams or sprayed ink, so it is quiet, fast and gives high quality output. Characteristics: - No mechanica...
What is computer booting? Describe the types of computer booting. [2.5+2.5]
Computer booting is the process of starting or restarting a computer and loading the operating system from secondary storage into main memory (RAM) so that the computer becomes ready to use. When power is switched on, the BIOS runs the P...
Write short notes on: a. Bar Code Reader b. Use of Internet [2.5+2.5]
a. Bar Code Reader A bar code reader (bar code scanner) is an input device that reads bar codes, which are patterns of parallel black and white lines of varying widths printed on products. It shines a light on the bar code, and a light s...
A logic gate is a basic electronic circuit that performs a logical operation on one or more binary inputs and produces a single binary output ( or ). Gates are the building blocks of all digital circuits. 1. AND gate - output is
A number system is a way of representing numbers using a fixed set of digits and a base (radix). The common systems are binary (base 2), octal (base 8), decimal (base 10) and hexadecimal (base 16). Conversion of to octal: Gro...
We compute . Aligning to 4 bits, the subtrahend is . Using 1's complement method: 1's complement of is . Add it to the minuend: $$ \begin{aligned} & \ \ 1000 \ +,& \ \ 1000 \ \hline & 1,0000 \end{...