SSC CGL Computer – Computer Organisation – CPU & Input/Output Devices – Exam-Level Drill

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SSC CGL Computer – Computer Organisation – CPU & Input/Output Devices – Exam-Level Drill – 10 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.  
How much memory can a CPU reach if its address bus has 30 lines and each address holds one byte?

Correct Answer: A [1 GB]

Explanation:

2³⁰ bytes = 1 GB (2³¹ would be 2 GB).

2.  
How much memory (in bytes) is needed for one 1024 × 768 screen at 24 bits per pixel?

Correct Answer: C [23,59,296]

Explanation:

7,86,432 pixels × 3 bytes = 23,59,296 bytes (= 2.25 MB).

3.  
The clock cycle time of a 3.2 GHz processor is:

Correct Answer: B [0.3125 ns]

Explanation:

Answer: 0.3125 ns. 1 ÷ 3.2 = 0.3125 ns.

4.  
A processor's clock cycle is 0.5 ns. Its clock frequency is:

Correct Answer: A [2 GHz]

Explanation:

Answer: 2 GHz. f = 1 ÷ 0.5 ns = 2 GHz.

5.  
With 16 bits per pixel, how many different colours can be shown?

Correct Answer: D [65,536]

Explanation:

Answer: 65,536. 2¹⁶ = 65,536 colours.

6.  
A 3840 × 2160 (4K UHD) screen has how many times the pixels of a 1920 × 1080 (Full HD) screen?

Correct Answer: D [4]

Explanation:

Both dimensions double → 2 × 2 = 4 times.

7.  
A dot-matrix printer prints 300 characters per second. How long does it take to print a document of 4,500 characters?

Correct Answer: B [15 seconds]

Explanation:

Answer: 15 seconds. 4,500 ÷ 300 = 15 s.

8.  
A printer rated at 20 PPM must print 25 copies of a 24-page booklet. Minimum time needed:

Correct Answer: A [30 minutes]

Explanation:

25 × 24 = 600 pages ÷ 20 = 30 min.

9.  
The aspect ratio of a 1920 × 1080 screen is:

Correct Answer: C [16 : 9]

Explanation:

1920 : 1080 = 16 : 9 (divide by 120).

10.  
How many clock cycles does a 3 GHz processor complete in one microsecond?

Correct Answer: C [3,000]

Explanation:

3 × 10⁹ × 10⁻⁶ = 3 × 10³ = 3,000.

➤ 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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