Download Class 7 Computer Science Concept Summaries: CBSE Class 7 Computer Science Computer Hardware Input Devices and Memory Notes with Questions Set 01
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Hardware and Software
Hardware is the part of the computer that you can touch. Software is a set of instructions that makes the computer do its work. Both are needed.
Input Devices
| Device | Function |
|---|---|
| Keyboard | Most common input device; 101 to 106 keys; layouts such as QWERTY, QWERTZ, AZERTY and Dvorak; invented by Christopher Latham Sholes; called a keypad on laptops |
| Mouse | Hand-held pointing device with two buttons and a scroll wheel; invented by Douglas Engelbart |
| Joystick | Pointing device; the pointer keeps moving in the direction the stick is pushed until it is brought upright |
| OMR (optical mark reader) | Detects marks on paper; used to check answer sheets |
| OCR (optical character reader) | Recognises shapes and identifies characters from a document |
| MICR | Used by banks to process cheques; reads magnetic ink code of 9 digits |
| Light pen | Light-sensitive device to select or draw on the screen |
| Barcode reader | Reads barcodes made of bars of different widths |
| Microphone | Voice input; converts sound into digital form |
| Digital camera | Captures pictures in digital form; quality measured in pixels |
| Web camera | Sends video in real time to a computer or network |
Memory
Memory stores data. It is of two kinds: primary and secondary.
| Memory | Details |
|---|---|
| RAM | Holds data temporarily while the computer works; volatile, so everything is lost when power goes off; sizes such as 1 GB, 4 GB, 8 GB; types SRAM and DRAM |
| ROM | Read Only Memory; non-volatile; stores pre-defined instructions; used at start-up (POST); types PROM, EPROM, EEPROM |
| BIOS | Basic Input Output System; stored in ROM; helps start the operating system |
| Cache memory | Part of the CPU; used when information moves between primary memory and the ALU |
Units of Storage
A computer uses binary digits, 0 and 1, each called a bit. 4 bits make a nibble and 8 bits make a byte.
| Unit | Equals |
|---|---|
| 1 Kilobyte (KB) | 1024 bytes |
| 1 Megabyte (MB) | 1024 KB |
| 1 Gigabyte (GB) | 1024 MB |
| 1 Terabyte (TB) | 1024 GB |
| 1 Petabyte (PB) | 1024 TB |
Secondary Memory
| Device | Details |
|---|---|
| Hard disk | Most used internal magnetic storage; metal platters with read/write heads; large capacity and fast |
| CD | Optical disc |
| DVD | Digital Versatile Disc; stores up to 4.7 GB |
| Blu-ray disc | Stores up to 50 GB |
| Pen drive | Small, handy, plugs into the USB port; used to transfer data |
| Memory stick / memory card | Flash storage; very small; from 1 GB to 128 GB and more |
Questions and Answers
1. Fill in: (a) A ___ is the standard input device. (b) The keyboard was invented by ___. (c) The quality of a digital camera image is measured in ___. (d) ___ is a USB device.
Show answer
Answer: (a) keyboard (b) Christopher Latham Sholes (c) pixels (d) Pen drive
Teacher's Note: Use the key term in your answer.
2. What is a barcode reader?
Show answer
Answer: A scanning device that reads barcodes, which are made of vertical bars of different widths, for example at billing counters.
Teacher's Note: Give an example if the question allows.
3. Why is RAM called volatile memory?
Show answer
Answer: Because its contents are lost when the computer is switched off or power is cut.
Teacher's Note: Write a short, clear answer.
4. Give examples of input devices.
Show answer
Answer: Keyboard, mouse, joystick, scanner, microphone, web camera.
Teacher's Note: Remember this for your exam.
All Chapters Concepts and Summary for Class 7 Computer Science
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You can download the teacher prepared revision notes for CBSE Class 7 Computer Science Computer Hardware Input Devices and Memory Notes with Questions Set 01 from StudiesToday.com. These notes are designed as per 2026-27 academic session to help Class 7 students get the best study material for Computer Science.
Yes, our CBSE Class 7 Computer Science Computer Hardware Input Devices and Memory Notes with Questions Set 01 include 50% competency-based questions with focus on core logic, keyword definitions, and the practical application of Computer Science principles which is important for getting more marks in 2026 CBSE exams.
Yes, our CBSE Class 7 Computer Science Computer Hardware Input Devices and Memory Notes with Questions Set 01 provide a detailed, topic wise breakdown of the chapter. Fundamental definitions, complex numerical formulas and all topics of CBSE syllabus in Class 7 is covered.
These notes for Computer Science are organized into bullet points and easy-to-read charts. By using CBSE Class 7 Computer Science Computer Hardware Input Devices and Memory Notes with Questions Set 01, Class 7 students fast revise formulas, key definitions before the exams.
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