SSC CGL Computer – Computer Organisation – CPU & Input/Output Devices – Level 2 · Exam Level · Section III pace

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SSC CGL Computer – Computer Organisation – CPU & Input/Output Devices – Level 2 · Exam Level · Section III pace – 15 questions, subject: Computer Knowledge. Every question has the correct answer with a one-line explanation; tap "Show Answer". Free practice for TNPSC, UPSC, SSC, Bank and RRB exams – Shanmugam IAS Academy, Coimbatore.

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1.  
Match the followingMatch the register with what it holds:
P. PC Q. IR R. MAR S. ACC
1. Current instruction 2. ALU result 3. Address of next instruction 4. Address of memory location to be accessed

Correct Answer: D [P-3, Q-1, R-4, S-2]

Explanation:

PC – next address; IR – current instruction; MAR – memory address; ACC – ALU result.

2.  
Odd one out

Correct Answer: A [Speaker]

Explanation:

Speaker is output; the others are input devices.

3.  
Which device converts a scanned image of a printed page into editable text?

Correct Answer: C [OCR]

Explanation:

Optical Character Recognition reads characters into text.

4.  
A CPU with a 20-line address bus and byte addressing can address at most:

Correct Answer: B [1 MB]

Explanation:

Answer: 1 MB. 2²⁰ = 1,048,576 bytes = 1 MB.

5.  
Assertion–Reason
A: An OLED screen does not need a backlight.
R: Each OLED pixel produces its own light.

Correct Answer: C [Both A and R are true and R explains A]

Explanation:

Self-emitting pixels are exactly why no backlight is needed.

6.  
Which of the following is both an input and an output device?

Correct Answer: B [Touch screen]

Explanation:

A touch screen takes touch input and displays output.

7.  
The unit 'PPM' is used to express the speed of:

Correct Answer: D [laser and inkjet printers]

Explanation:

PPM = pages per minute (page printers).

8.  
True/False countHow many of these are true?
(i) The Control Unit decodes instructions.
(ii) The Control Unit performs addition.
(iii) Registers are faster than main memory.
(iv) A multi-core processor has two or more processing units on one chip.

Correct Answer: A [3]

Explanation:

(ii) is false – addition is done by the ALU; the rest are true.

9.  
A laser printer forms the page image on a drum and fixes the powder on paper by heat. The powder is called:

Correct Answer: A [Toner]

Explanation:

Laser printers use toner fused by heat.

10.  
Which display technology uses an electron beam striking phosphor?

Correct Answer: D [CRT]

Explanation:

Cathode Ray Tube – electron gun and phosphor coating.

11.  
Screen size of a monitor is measured:

Correct Answer: B [diagonally]

Explanation:

Monitor size = diagonal length in inches.

12.  
Fill in the blankThe ______ keeps the date, time and BIOS/UEFI settings when the computer is switched off.

Correct Answer: C [CMOS battery]

Explanation:

A small coin cell (CMOS battery) powers the clock and settings.

13.  
Barcodes on products at a billing counter are read by a:

Correct Answer: D [Bar code reader]

Explanation:

Answer: Bar code reader. BCR reads bars and spaces.

14.  
The mouse was invented by:

Correct Answer: A [Douglas Engelbart]

Explanation:

Douglas Engelbart invented the computer mouse in the 1960s.

15.  
Reverse questionThe answer is 'ARM-type RISC processor'. Which description fits?

Correct Answer: C [Fewer, simpler instructions; common in smartphones]

Explanation:

RISC = reduced (simple) instruction set; ARM family is widely used in phones.

➤ Full notes, shortcuts and every answer explained – SSC CGL 2026 Computer Knowledge book (₹149): www.shanmugamiasacademy.in/study-materials/ssc-cgl-computer-knowledge

📘 SSC CGL 2026 – Computer Knowledge (Tier II Paper I – Section III)
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