SSC CGL Computer – Software & Operating Systems; Windows & File Explorer – Exam-Level Drill

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SSC CGL Computer – Software & Operating Systems; Windows & File Explorer – 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.  
P1, P2, P3 arrive at time 0 (in that order) with bursts 6, 2 and 4 ms. Average waiting time under FCFS:

Correct Answer: C [14/3 ≈ 4.67 ms]

Explanation:

Waits 0, 6, 8 → 14 ÷ 3 ≈ 4.67 ms.

2.  
For the same processes under SJF (non-pre-emptive), the average waiting time is:

Correct Answer: B [8/3 ≈ 2.67 ms]

Explanation:

Order 2, 4, 6 → waits 0, 2, 6 → 8 ÷ 3 ≈ 2.67 ms.

3.  
Under FCFS for bursts 6, 2, 4 ms (all arriving at 0), the average turnaround time is:

Correct Answer: D [26/3 ≈ 8.67 ms]

Explanation:

Completion times 6, 8, 12 → 26 ÷ 3 ≈ 8.67 ms.

4.  
Round Robin, quantum 2 ms: P1 = 4, P2 = 3, P3 = 2 ms, all at time 0 in that order. At what time does P2 finish?

Correct Answer: A [9 ms]

Explanation:

Chart: P1 0–2, P2 2–4, P3 4–6 (done), P1 6–8 (done), P2 8–9 (done).

5.  
A 6 GB video file cannot be copied to a pen drive although 20 GB is free. The most likely reason is:

Correct Answer: C [The pen drive is formatted as FAT32]

Explanation:

FAT32 allows files only up to 4 GB − 1 byte; use exFAT or NTFS.

6.  
In the booting sequence, which step comes immediately after POST?

Correct Answer: A [The firmware finds the boot device]

Explanation:

Firmware → POST → boot device → kernel → login.

7.  
Statement-basedWhich statement about compilers and interpreters is NOT correct?

Correct Answer: C [An interpreter creates a separate executable file]

Explanation:

Only a compiler produces a separate executable (object) file.

8.  
Match the followingMatch the deadlock condition with its meaning:
P. Mutual exclusion Q. Hold and wait R. No pre-emption S. Circular wait
1. A process keeps one resource while asking for another 2. A resource cannot be taken away by force 3. Each process waits for the next in a closed chain 4. Only one process can use a resource at a time

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

Explanation:

The four Coffman conditions; breaking any one prevents deadlock.

9.  
In a Windows path 'C:\Users\Ravi\Documents\Plan.xlsx', which part is the file's extension?

Correct Answer: D [xlsx]

Explanation:

The letters after the last dot – an Excel workbook.

10.  
Statement-basedWhich pair is NOT correctly matched?

Correct Answer: D [5GL – SQL]

Explanation:

SQL is 4GL; 5GL examples are logic languages such as Prolog.

➤ 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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