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

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SSC CGL Mock – Computer Knowledge Tests 1–5 – Test 1 · Foundation – 20 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.  
Which part of the CPU carries out arithmetic and logical operations, such as checking whether one number is greater than another?

Correct Answer: A [Arithmetic Logic Unit (ALU)]

Explanation:

The ALU does arithmetic and logic work, including comparisons; the Control Unit only directs the other units.

2.  
Which unit of the CPU fetches and decodes instructions and sends control signals to the other units, without processing any data itself?

Correct Answer: B [Control Unit]

Explanation:

The Control Unit fetches, decodes and directs; the actual processing of data is done by the ALU.

3.  
Arrange in orderArrange the steps of the machine (instruction) cycle in the correct order:
P. Decode Q. Store (write back) R. Fetch S. Execute

Correct Answer: D [R → P → S → Q]

Explanation:

An instruction is first fetched, then decoded, then executed and its result stored: R → P → S → Q.

4.  
Objective-type answer sheets on which candidates darken small circles are read by which technology?

Correct Answer: C [OMR]

Explanation:

OMR (Optical Mark Recognition) senses marks or darkened bubbles; OCR reads printed characters.

5.  
Situation-basedAn architect needs to draw a large building plan with fine, precise lines on very big sheets of paper. Which device suits this job?

Correct Answer: C [Plotter]

Explanation:

A plotter draws large technical drawings (output); scanner, joystick and light pen are input devices.

6.  
Which memory loses everything stored in it when the power is switched off?

Correct Answer: A [RAM]

Explanation:

RAM is volatile; ROM, hard disks and flash pen drives keep their data without power.

7.  
How many bits make one nibble?

Correct Answer: B [4]

Explanation:

1 nibble = 4 bits; 2 nibbles = 1 byte = 8 bits.

8.  
Which connector is used at the end of a wired Ethernet (LAN) cable?

Correct Answer: D [RJ-45]

Explanation:

RJ-45 has 8 contacts and is used for Ethernet; RJ-11 is the smaller telephone connector.

9.  
A folder is selected in File Explorer and you press F2. What happens?

Correct Answer: D [Its name becomes editable (rename)]

Explanation:

F2 = rename; F3 = search, F5 = refresh, Alt + Enter = Properties.

10.  
Which key combination opens File Explorer directly in Windows?

Correct Answer: A [Win + E]

Explanation:

Win + E opens File Explorer; Win + D shows the desktop, Win + L locks, Win + R opens Run.

11.  
In MS Word, which shortcut lines up the selected paragraph with both the left and the right margins (justify)?

Correct Answer: B [Ctrl + J]

Explanation:

Ctrl + J = justify; Ctrl + E = centre, Ctrl + L = align left, Ctrl + R = align right.

12.  
Formula outputIn MS Excel, cells A1, A2, A3 and A4 hold 15, 13, 20 and 19. What does =SUM(A1:A4) return?

Correct Answer: C [67]

Explanation:

SUM adds every number in A1:A4: 15 + 13 + 20 + 19 = 67.

13.  
What happens when you press F5 in MS PowerPoint (Windows)?

Correct Answer: A [The slide show starts from the first slide]

Explanation:

F5 starts the show from the beginning; Shift + F5 starts it from the current slide.

14.  
In MS Excel, the cell address D7 means

Correct Answer: D [column D, row 7]

Explanation:

Excel names a cell by its column letter followed by its row number: D7 = column D, row 7.

15.  
Addresses typed in which field of an e-mail are NOT shown to the other people who receive it?

Correct Answer: B [Bcc]

Explanation:

Bcc = blind carbon copy: its addresses are hidden from the other receivers; Cc is visible to all.

16.  
URL, the address of a web page, stands for

Correct Answer: C [Uniform Resource Locator]

Explanation:

URL = Uniform Resource Locator, e.g.

17.  
A network that links the computers inside one office building is called a

Correct Answer: B [LAN]

Explanation:

LAN (Local Area Network) covers a room, building or campus; MAN a city; WAN a country or more.

18.  
Which device joins different networks and forwards data packets between them using IP addresses?

Correct Answer: C [Router]

Explanation:

A router works with IP addresses between networks; a switch works with MAC addresses inside one network.

19.  
Malware that copies itself and spreads across a network on its own, without attaching to a host file, is a

Correct Answer: D [Worm]

Explanation:

A worm is self-contained and spreads by itself; a virus needs a host file or program.

20.  
An e-mail that pretends to come from your bank and asks you to 'verify' your password through a link is an example of

Correct Answer: A [Phishing]

Explanation:

Phishing uses fake messages that look genuine to steal passwords or card details.

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