Class 9 Computer Science: Sample Question Paper- 1 (With Solutions) | Sample Papers For Class 9 PDF Download

General Instructions:
1. The Question Paper contains three sections A, B and C. Each section is compulsory.
2. Section A has 4 questions of short answer type. Each question is of 2 marks. Internal choice is provided in 1 question.
3. Section B has 3 questions of Long Answer Type-I (LA-I). Each question is of 3 marks. Internal choice is provided in 1 question.
4. Section C has 2 questions of Long Answer Type-II (LA-II). Each question is of 4 marks.

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Section A

Q.1: Write any two limitations of primary memory.

Limitations of primary memory include:

• Limited storage capacity: Primary memory has a restricted amount of space for data storage.
• Volatile nature: Data stored in primary memory is temporary and lost when power is turned off.

Q.2: Define Operating System? Give any three examples of operating system.

Explain IPO cycle, with block diagram.

An operating system is a system software which acts as an interface between a user and the hardware. It manages computer hardware and controls the execution of application programs. Examples of operating system are Windows, Unix and Linux.

OR

The basic principle on which the computer works is known as IPO cycle. The input is the data which is feed by the user for processing, supported by storage and finally the output is given in the form of information.

Q.3: What is monitor?

A monitor is an output device used to display information, programs, and applications from a computer. Like televisions, monitors are available in various sizes. 
Some types of monitors include:

• Cathode Ray Tube (CRT)
• Liquid Crystal Display (LCD)
• Light Emitting Diode (LED)

Q.4: Explain the function of ‘Autofill’? 

Autofill is a feature in Excel that automatically fills certain boxes with data that follows a pattern or is based on information the user has entered elsewhere. This functionality enhances efficiency by reducing the need for repetitive data entry.

This section has 3 questions of Long Answer Type-I (LA-I). Each question is of 3 marks. Internal choice is provided in 1 question.

Q.5: Discuss the types of operating system based on user interaction.

On the basis of user interaction, operating systems are divided into two types:
(i) CUI: It stands for Command User Interface. They are operating systems which work on instructions given by user in the form of commands.
For example: DOS, Unix, Novell.
(ii) GUI: It stands for Graphical User Interface. They are the operating systems which have graphics so that users can interact more easily and interestingly.
For example: Windows, Macintosh, Android.

Q.6: Name the basic units of the computer? Mention the parts of CPU and their functions.

The computer system is composed of three basic units:
(i) Input unit
(ii) Central Processing Unit (CPU)
(iii) Output Unit
The CPU or Central Processing Unit comprises of three sub units:
(i) Control Unit – This unit coordinates the operation of the processor by telling the computer ’s memory, ALU and input and output devices how to respond to a program’s instructions.
(ii) Arithmetic and Logic Unit (ALU) – This unit executes most of the arithmetic and logical operations of a computer.
(iii) Memory Unit - The memory unit is a component of a computer system. It is used to store data, instructions and information. It is also known as a primary or internal memory.
The following block diagram shows the parts of computer:

Q.7: What is a real-time system?

Define the following
(i) Hardware
(ii) Software

A real time process is a process that must respond to the events within a certain time period. A real time operating system is an operating system that can run real time processes successfully. A real time operating system (RTOS) is an operating system (OS) intended to serve real-time application requests. It has an advanced algorithm for scheduling.

OR

Hardware refers to the physical components of a computer system, including the machinery and equipment required for operation. In contrast, software consists of the programs and applications used to perform specific tasks.

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Section C

This section has 2 questions of Long Answer Type-II (LA-II). Each question is of 4 marks. Question-8 is of case-based type.

Q.8: Read the case study given below and attempt any 4 sub-questions (out of 5). Each sub-question carries 1 mark.

Working of Computer(I-P-O Cycle)

A computer system consists of hardware, the physical unit (parts) of the computer that are capable of computing and manipulating information and software that carries out predefined tasks to complete a given job. The computer performs operations like addition, subtraction, multiplication and division only when the user instructs it to do so. The user issues instructions and the CPU acts in accordance with the instructions. The sets of instructions, which control the sequence of operations, are known as programs, and collectively programs are called software.
(i) What does I-P-O stand for?
(ii) A set of instructions or programs is called a ...................... .
(iii) The ...................... issues instructions and the CPU acts in accordance with the instructions.
(iv) Which part of CPU performs calculations like addition, subtraction, multiplication and division?
(v) What does CPU stand for?

(i) Input-Process-Output: I-P-O represents the sequence of operations in computing: Input refers to data entry, Process involves manipulating the data, and Output is the result presented to the user.
(ii) Software: A set of instructions that directs a computer to perform tasks is known as software. This encompasses all programs that enable hardware to function effectively.
(iii) User: The user is the individual who interacts with the computer by issuing commands, which the CPU then processes to execute the desired tasks.
(iv) ALU: The Arithmetic Logic Unit (ALU) is the component of the CPU responsible for carrying out arithmetic operations such as addition, subtraction, multiplication, and division.
(v) Central Processing Unit: The acronym CPU stands for Central Processing Unit, which is the primary component that executes instructions in a computer system, acting as its brain.

Q.9: Write the steps to present animation.

To present an animation, follow these steps:

(i) Select slide show > Animation schemes to display the side design pane with animation schemes displayed in the pane.
(ii) Choose the effect from under the heading recently used on animation, subtle moderate or exciting.  
(iii) To preview the animation, click auto preview pane.
(iv) Click apply to all slides, for apply the animation to all slides