SSC CGL Mock – Computer Knowledge Tests 1–5 – Test 2 · Foundation

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SSC CGL Mock – Computer Knowledge Tests 1–5 – Test 2 · Foundation – 19 questions, subject: Full Mock Tests. 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.  
The Program Counter (PC) of a CPU holds

Correct Answer: B [the address of the next instruction to be executed]

Explanation:

The PC points to the next instruction; the IR holds the current instruction; the accumulator holds ALU results.

2.  
A processor runs at 2.8 GHz. How many clock cycles is that per second?

Correct Answer: D [2.8 × 10⁹]

Explanation:

Giga = 10⁹, so 2.8 GHz = 2.8 × 10⁹ cycles (hertz) per second.

3.  
Statement-basedConsider the statements about the system bus:
I. The address bus carries memory addresses from the CPU.
II. The data bus can carry data in one direction only.
Which of the statements is/are correct?

Correct Answer: A [Only I]

Explanation:

The address bus is one-way (from the CPU); the data bus is two-way – data travel to and from the CPU.

4.  
The numbers printed in magnetic ink at the bottom of bank cheques are read by

Correct Answer: C [MICR]

Explanation:

MICR = Magnetic Ink Character Recognition, used by banks to read cheque details.

5.  
A railway booking office needs carbon copies of each ticket printed in one pass. Which printer can do this because its pins strike the paper through a ribbon?

Correct Answer: A [Dot matrix printer]

Explanation:

A dot matrix printer strikes pins through a ribbon (impact); laser, inkjet and thermal printers do not strike the paper.

6.  
Arrange in orderArrange from the fastest to the slowest:
P. RAM Q. Cache memory R. Hard disk S. CPU registers

Correct Answer: C [S → Q → P → R]

Explanation:

Memory hierarchy, fastest first: registers → cache → RAM → hard disk: S → Q → P → R.

7.  
CalculationUsing binary units (1 GB = 1,024 MB), 2 GB is equal to

Correct Answer: B [2,048 MB]

Explanation:

Answer: 2,048 MB. 2 × 1,024 = 2,048 MB.

8.  
Situation-basedMeena wants a single cable to carry both picture and sound from her laptop to a new LED TV. Which port should she use?

Correct Answer: D [HDMI]

Explanation:

HDMI carries digital video and audio together; VGA is analog video only.

9.  
What happens when you press Shift + Delete on a file in File Explorer?

Correct Answer: A [It is deleted permanently, skipping the Recycle Bin]

Explanation:

Delete alone sends a file to the Recycle Bin; Shift + Delete removes it without the Recycle Bin.

10.  
What does the key combination Win + L do in Windows?

Correct Answer: B [Locks the computer]

Explanation:

Win + L locks the PC; Win + I = Settings, Win + D = desktop, Win + R = Run.

11.  
Formula outputIn MS Excel, cells B2 to B6 hold 13, 32, 28, 23 and 39. What does =AVERAGE(B2:B6) return?

Correct Answer: A [27]

Explanation:

AVERAGE = sum ÷ count = 135 ÷ 5 = 27.

12.  
Which PowerPoint view shows all slides as small thumbnails, so that you can drag them into a new order?

Correct Answer: C [Slide Sorter]

Explanation:

Slide Sorter shows every slide as a thumbnail for reordering, hiding or deleting.

13.  
In MS Excel, a formula is normally typed starting with which sign?

Correct Answer: C [the equals sign (=)]

Explanation:

A formula begins with =; $ fixes a reference (as in $A$1) and & joins text.

14.  
While setting up an e-mail app, the 'outgoing mail server' you enter (often on port 587) is a server of which protocol?

Correct Answer: B [SMTP]

Explanation:

Outgoing mail is handed over by SMTP (Simple Mail Transfer Protocol); POP3 and IMAP are for incoming mail.

15.  
In digital payments, UPI stands for

Correct Answer: D [Unified Payments Interface]

Explanation:

UPI = Unified Payments Interface, the bank-to-bank instant payment system used through mobile apps.

16.  
In which topology is each computer connected to exactly two neighbours so that the cables form a closed loop?

Correct Answer: A [Ring]

Explanation:

Ring: data passes from neighbour to neighbour round the loop; star uses a central hub, bus one shared cable.

17.  
How many bits make up an IPv4 address?

Correct Answer: C [32]

Explanation:

IPv4 = 32 bits written as four numbers 0–255 (e.g.

18.  
A program that looks useful but secretly harms the system or opens a back door for an attacker is a

Correct Answer: D [Trojan horse]

Explanation:

A Trojan horse hides harm inside a program that looks genuine; it does not copy itself like a worm.

19.  
What is the main job of a firewall?

Correct Answer: A [To allow or block network traffic according to set rules]

Explanation:

A firewall (hardware or software) filters incoming and outgoing traffic using security rules.

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