SSC CGL Computer – Memory, Storage, Backup Devices & Ports – Exam-Level Drill

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SSC CGL Computer – Memory, Storage, Backup Devices & Ports – 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.  
A disk has 6 surfaces, 1,000 tracks per surface, 400 sectors per track and 512 bytes per sector. Its capacity is:

Correct Answer: B [1,22,88,00,000 bytes]

Explanation:

6 × 1,000 × 400 × 512 = 1,22,88,00,000 bytes.

2.  
Average rotational latency of a 5,400 RPM disk is about:

Correct Answer: D [5.56 ms]

Explanation:

One rotation = 60,000 ÷ 5,400 ≈ 11.11 ms; average = half ≈ 5.56 ms.

3.  
Cache time 20 ns, memory time 120 ns, hit ratio 0.8. Using EAT = h × Tc + (1 − h) × Tm, the effective access time is:

Correct Answer: A [40 ns]

Explanation:

0.8 × 20 + 0.2 × 120 = 16 + 24 = 40 ns.

4.  
A 4,500 MB file is copied at 75 MB/s. Time taken:

Correct Answer: B [60 seconds]

Explanation:

Answer: 60 seconds. 4,500 ÷ 75 = 60 s.

5.  
A full backup is taken on Sunday. New, different files of 3 GB, 4 GB, 2 GB and 5 GB change on Mon, Tue, Wed and Thu. What is the size of Thursday's differential backup?

Correct Answer: C [14 GB]

Explanation:

Differential = all changes since Sunday's full: 3 + 4 + 2 + 5 = 14 GB.

6.  
In the same week (full on Sunday, a differential backup each night Mon–Thu), how many backup sets are needed to restore Thursday night's data?

Correct Answer: D [2]

Explanation:

Sunday's full + Thursday's differential (it holds every change since the full) = 2 sets.

7.  
Using 1 GB = 1,000 MB for disc labels, how many 700 MB CDs are needed to hold the data of one full 4.7 GB DVD?

Correct Answer: A [7]

Explanation:

4,700 ÷ 700 ≈ 6.7, and a part-disc is still a disc → 7 CDs are needed.

8.  
How many MB make 1 TB (binary units)?

Correct Answer: C [10,48,576]

Explanation:

TB → GB → MB = 1,024 × 1,024 = 2²⁰ MB.

9.  
A disk sold as '500 GB' (500 × 10⁹ bytes) shows about how many GB in Windows, which counts 1 GB = 2³⁰ bytes?

Correct Answer: B [466 GB]

Explanation:

500 × 10⁹ ÷ 1,07,37,41,824 ≈ 465.7 GB.

10.  
Arrange in orderArrange from slowest to fastest: RAM, register, magnetic tape, cache, SSD

Correct Answer: D [Magnetic tape, SSD, RAM, Cache, Register]

Explanation:

Pyramid from bottom to top: tape → SSD → RAM → cache → register.

➤ 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)
Here you get the answer with a one-line explanation. 672 original questions with answer key and explanations · notes, figures, shortcut keys and memory aids · practice sets + 3 Computer Knowledge mock tests
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