Class 4 Computer Science Test Paper 2 -Memory and Data

Here are some challenging Olympiad-style questions for Class 4 Computer Science:

Section A: Logical Thinking & Computer Fundamentals (MCQs)

1. Which of the following stores the operating system and essential instructions permanently?
   1. RAM
   2. ROM
   3. Hard Drive
   4. Cache
2. A computer processes information using:
   1. Monitor
   2. CPU
   3. Keyboard
   4. Printer
3. What is the function of an algorithm?
   1. To store data
   2. To give step-by-step instructions for solving a problem
   3. To display images
   4. To connect to the internet
4. Which of these units is responsible for performing calculations and making decisions in a computer?
   1. ALU (Arithmetic Logic Unit)
   2. Monitor
   3. RAM
   4. Hard Drive
5. The binary number system consists of:
   1. Digits from 0 to 9
   2. Only 0 and 1
   3. Letters A to Z
   4. Special symbols

Section B: Fill in the Blanks (Concept-Based)

1. The full form of CPU is _______.
2. The memory that loses data when the computer turns off is _______.
3. _______ is the brain of the computer.
4. A computer follows a sequence of steps to solve a problem, called an _______.
5. The smallest unit of memory in a computer is called a _______.

Section C: Logical Reasoning (True or False)

1. A computer can think and make decisions on its own. (True / False)
2. RAM is a type of volatile memory. (True / False)
3. Algorithms help computers solve problems in an organized way. (True / False)
4. The mouse is an output device. (True / False)
5. All computers have an operating system. (True / False)

Section D: Critical Thinking & Short Answer Questions

1. What is the difference between primary memory and secondary memory?
2. How does a CPU process instructions in a computer?
3. Why is binary code used in computers instead of the decimal system?

Section E: Long Answer Question

1. Explain the working of input, processing, and output in a computer system with examples.

Here’s the answer key for the Olympiad-style test:

Answer Key for Class 4 Computer Science Olympiad Questions

Section A: Logical Thinking & Computer Fundamentals (MCQs)

1. b) ROM
2. b) CPU
3. b) To give step-by-step instructions for solving a problem
4. a) ALU (Arithmetic Logic Unit)
5. b) Only 0 and 1

Section B: Fill in the Blanks

1. The full form of CPU is Central Processing Unit.
2. The memory that loses data when the computer turns off is RAM.
3. CPU is the brain of the computer.
4. A computer follows a sequence of steps to solve a problem, called an Algorithm.
5. The smallest unit of memory in a computer is called a Bit.

Section C: Logical Reasoning (True or False)

1. False (A computer cannot think or make decisions on its own; it follows instructions.)
2. True (RAM is volatile and loses data when the computer is powered off.)
3. True (Algorithms help computers solve problems systematically.)
4. False (The mouse is an input device, not an output device.)
5. True (Every computer requires an operating system to function.)

Section D: Critical Thinking & Short Answer Questions

1. Difference Between Primary Memory and Secondary Memory:
   • Primary Memory (RAM & ROM): Stores data temporarily or permanently for immediate access.
   • Secondary Memory (Hard Drive, SSD, USB, etc.): Stores data permanently for long-term use.
2. How CPU Processes Instructions:
   • The CPU fetches, decodes, executes, and stores instructions in a cycle.
   • ALU performs arithmetic and logical operations, while the Control Unit directs instructions.
3. Why Binary Code is Used in Computers Instead of the Decimal System:
   • Computers use binary (0 & 1) because electronic circuits can represent two states (ON/OFF).
   • Binary is simple for digital processing and ensures accuracy in calculations.

Section E: Long Answer Question

1. Working of Input, Processing, and Output in a Computer System:
   • Input: The user enters data using input devices like a keyboard or mouse.
   • Processing: The CPU processes instructions and converts data into meaningful information.
   • Output: The processed information is displayed through output devices like a monitor or printer.
   • Example: Typing a word on a keyboard (input), the CPU processes it, and the word appears on the screen (output).