Which of the following is an input device?
- A. Monitor
- B. Speaker
- C. Keyboard
- D. Projector
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Correct option: C — Keyboard
A keyboard sends data into the computer; monitor and speaker are output.
Class 9 · कंप्यूटर · 255+ Q&A
Class 9 Computer — Hardware Important Questions with Answers
IT basics, hardware, software, internet safety and MS Office for Class 9. Showing 20 of 26 on page 1 / 2.
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- अगला पेज · एक स्क्रीन पर 20 प्रश्न
All chapters
1. Hardware
2. Software
3. Operating System
4. Memory and Storage
5. Input and Output
6. Networking
7. Internet and Email
8. Cyber Safety
9. MS Office
10. Number System
11. IPR and Digital Ethics
Page 1 of 2 · 26 questions in this view
The brain of the computer is the
- A. Hard disk
- B. CPU
- C. UPS
- D. Plotter
View the correct answer
Correct option: B — CPU
The Central Processing Unit fetches, decodes and executes instructions.
ALU stands for
- A. Always Logical Unit
- B. Arithmetic Logic Unit
- C. Analog Link USB
- D. Array Late Update
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Correct option: B — Arithmetic Logic Unit
ALU performs arithmetic and logical operations inside the CPU.
Which is a storage device?
- A. Mouse
- B. SSD / hard disk
- C. Microphone
- D. Joystick only as storage
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Correct option: B — SSD / hard disk
Hard disk and SSD store data permanently until deleted.
UPS is used to
- A. increase RAM permanently
- B. give backup power during a cut
- C. print colour pages
- D. browse faster always
View the correct answer
Correct option: B — give backup power during a cut
Uninterruptible Power Supply protects against sudden shutdown.
A scanner is
- A. only an output device
- B. an input device that digitises paper
- C. a programming language
- D. an email protocol
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Correct option: B — an input device that digitises paper
It converts printed images or text into digital form.
Which printer uses toner like a photocopier?
- A. Dot-matrix only
- B. Laser printer
- C. Plotter pen only
- D. Braille slate
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Correct option: B — Laser printer
Laser printers are common in school offices for fast text.
Motherboard is
- A. a software office suite
- B. the main circuit board that connects CPU, RAM and slots
- C. an internet browser
- D. a cyber law
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Correct option: B — the main circuit board that connects CPU, RAM and slots
Other cards and drives plug into it.
Which is volatile memory?
- A. ROM
- B. RAM
- C. DVD
- D. Pen drive
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Correct option: B — RAM
RAM loses contents when power is off.
A plotter is best used to
- A. type essays
- B. draw large engineering or map drawings
- C. scan fingerprints only
- D. send email
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Correct option: B — draw large engineering or map drawings
It is a specialised output device.
Registers are
- A. classroom benches
- B. tiny fastest storage inside the CPU
- C. email folders
- D. WAN cables
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Correct option: B — tiny fastest storage inside the CPU
They hold data the ALU is using right now.
A port is
- A. a school gate only
- B. a socket such as USB or HDMI to connect devices
- C. a type of font
- D. a search engine
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Correct option: B — a socket such as USB or HDMI to connect devices
Match the cable to the port.
Clock speed of a CPU is often measured in
- A. litres
- B. GHz (gigahertz)
- C. kilograms
- D. pages per minute only
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Correct option: B — GHz (gigahertz)
Higher is not the only measure of speed.
HDMI is commonly used to
- A. carry high-definition video and audio to a display
- B. store 1 KB only
- C. compile Java
- D. filter spam
View the correct answer
Correct option: A — carry high-definition video and audio to a display
A display port/cable standard.
A touchpad is
- A. an output printer
- B. a pointing input device on a laptop
- C. a WAN
- D. ROM
View the correct answer
Correct option: B — a pointing input device on a laptop
It moves the pointer.
Which is both input and output?
- A. A classic CRT as only output; a touchscreen kiosk
- B. A speaker
- C. A barcode wand only
- D. A microphone only
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Correct option: A — A classic CRT as only output; a touchscreen kiosk
Touch display shows and responds.
Which statement is true?
- A. Software can replace all hardware
- B. Hardware is the physical parts; software is the instructions
- C. RAM is an output printer
- D. A mouse is an OS
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Correct option: B — Hardware is the physical parts; software is the instructions
Both are needed.
Which cooling device is common in a desktop?
- A. Plotter
- B. CPU fan / heatsink
- C. Scanner lamp as the only cooler
- D. Stylus
View the correct answer
Correct option: B — CPU fan / heatsink
Heat shortens hardware life.
What is hardware? Give four examples.
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Hardware is the physical parts of a computer you can touch. Examples: CPU, monitor, keyboard, mouse, printer, hard disk. It cannot work usefully without software. Handle lab hardware with dry hands and care for ports.
Write the main parts of a CPU and their jobs.
View the correct answer
ALU does arithmetic and logic. The control unit directs the flow of instructions. Registers hold data the CPU is using. Together they fetch, decode and execute. Clock pulses keep the steps in time.
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Class 9 Computer में कितने प्रश्न हैं? 255 महत्वपूर्ण प्रश्न: 174 MCQ, 50 लघु, 31 दीर्घ।
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