SSC CGL Computer – Computer Organisation – CPU & Input/Output Devices – Level 1 · Warm-up

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SSC CGL Computer – Computer Organisation – CPU & Input/Output Devices – Level 1 · Warm-up – 12 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.  
Which unit of the CPU performs arithmetic and logical operations?

Correct Answer: B [ALU]

Explanation:

ALU = Arithmetic Logic Unit; the CU only directs.

2.  
Which register holds the instruction that is currently being decoded?

Correct Answer: A [Instruction Register]

Explanation:

IR holds the current instruction; PC holds the address of the next one; MAR holds a memory address.

3.  
Arrange in orderThe correct order of the machine cycle is:

Correct Answer: D [Fetch → Decode → Execute → Store]

Explanation:

Fresh Dosa Every Sunday: Fetch, Decode, Execute, Store.

4.  
Which of these is an output device?

Correct Answer: C [Projector]

Explanation:

A projector shows output on a screen; a microphone, webcam and trackball send data in.

5.  
OMR is mainly used to:

Correct Answer: D [evaluate objective answer sheets]

Explanation:

OMR reads marks (filled bubbles) in fixed positions.

6.  
MICR stands for:

Correct Answer: B [Magnetic Ink Character Recognition]

Explanation:

M = Magnetic, I = Ink, C = Character, R = Recognition.

7.  
Which of these printers is an impact printer?

Correct Answer: A [Daisy wheel printer]

Explanation:

A daisy wheel strikes the ribbon against the paper (impact); laser, inkjet and thermal print without striking.

8.  
One-line recallThe smallest dot that makes up a picture on a screen is called a:

Correct Answer: C [Pixel]

Explanation:

Answer: Pixel. Pixel = picture element.

9.  
Fill in the blankClock speed of a processor is measured in ______.

Correct Answer: C [hertz (e.g. GHz)]

Explanation:

Clock ticks per second → hertz; 1 GHz = 10⁹ Hz.

10.  
The common keyboard layout is named QWERTY because:

Correct Answer: B [these are the first six letters of the top letter row]

Explanation:

Q-W-E-R-T-Y are the first six letters of the top letter row.

11.  
Which key is a toggle key?

Correct Answer: A [Caps Lock]

Explanation:

Caps Lock, Num Lock and Scroll Lock switch a mode on/off.

12.  
Statement-basedWhich is/are correct?
I. The address bus carries data in both directions.
II. The data bus carries data in both directions.

Correct Answer: D [Only II]

Explanation:

Address bus is one-way (CPU → memory); data bus is two-way.

➤ 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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