SSC CGL Mock – Computer Knowledge Tests 1–5 – Test 5 · Above exam level

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SSC CGL Mock – Computer Knowledge Tests 1–5 – Test 5 · Above exam level – 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.  
Two-quantity comparisonQuantity I: number of memory locations that 20 address lines can address.
Quantity II: number of bytes in 1 MB (1 MB = 1,024 KB; 1 KB = 1,024 bytes).

Correct Answer: C [Quantity I = Quantity II]

Explanation:

I = 2 20 = 10,48,576; II = 1,024 × 1,024 = 10,48,576.

2.  
The SMPS of a desktop computer converts

Correct Answer: C [AC mains power into low-voltage DC for the components]

Explanation:

SMPS (Switched-Mode Power Supply) turns AC mains into the low-voltage DC that the parts need.

3.  
CalculationA CPU runs at 2 GHz and needs exactly 4 clock cycles for every instruction. How many instructions does it complete per second?

Correct Answer: A [5 × 10⁸]

Explanation:

2 × 10⁹ cycles ÷ 4 = 50,00,00,000 = 5 × 10⁸ instructions per second.

4.  
Odd one outFind the odd one out.

Correct Answer: A [Plotter]

Explanation:

OCR, OMR and MICR read data into the computer (input); a plotter gives output.

5.  
CalculationA 4-inch × 6-inch photograph is scanned at 300 dpi. How many pixels does the scanned image have?

Correct Answer: B [21,60,000]

Explanation:

4 × 300 = 1200 and 6 × 300 = 1800; 1200 × 1800 = 21,60,000 pixels.

6.  
CalculationA hard disk spins at 10,000 rpm. What is its average rotational latency (time for half a rotation)?

Correct Answer: C [≈ 3.00 ms]

Explanation:

One rotation = 60 s ÷ 10,000 = 6.00 ms; half of it = 3.00 ms.

7.  
CalculationA memory chip has 4,096 locations, each holding 8 bits. What is its capacity?

Correct Answer: D [4 KB]

Explanation:

4,096 × 8 bits = 32,768 bits = 4,096 bytes = 4 KB.

8.  
The 3-2-1 rule of backup says you should keep

Correct Answer: D [3 copies of the data, on 2 different media, with 1 copy off-site]

Explanation:

3-2-1: three copies, two kinds of storage media, one copy kept away from the site.

9.  
Statement-basedConsider the statements about Windows screenshots:
I. Win + Shift + S lets you capture a part of the screen to the clipboard.
II. Win + PrtScn saves a full-screen screenshot in Pictures → Screenshots.
Which of the statements is/are correct?

Correct Answer: C [Both I and II]

Explanation:

Both are standard Windows shortcuts: Win + Shift + S = snip part of the screen; Win + PrtScn = save a full screenshot.

10.  
What does Ctrl + Shift + N do in File Explorer and in Google Chrome, respectively?

Correct Answer: C [Creates a new folder; opens a new Incognito window]

Explanation:

Same keys, different programs: File Explorer – new folder; Chrome – new Incognito window.

11.  
Formula outputA mark sheet adds two scores with =A1+B1 in C1. Priya copies this cell and pastes it two columns right and two rows down, into E3. What will E3 show?

Correct Answer: B [=C3+D3]

Explanation:

From C1 to E3 is 2 columns right and 2 rows down, so every relative reference moves the same way: =C3+D3 .

12.  
Formula outputWhat value does Excel show for the formula =2+3*4^2?

Correct Answer: A [50]

Explanation:

Order: ^ first (4^2 = 16), then * (3 × 16 = 48), then + (2 + 48 = 50).

13.  
In MS Word Mail Merge, the file that holds the names and addresses to be filled in is called the

Correct Answer: A [data source]

Explanation:

Mail Merge joins a main document (the letter) with a data source (the list of recipients).

14.  
A PowerPoint file saved with the extension .ppsx opens directly in

Correct Answer: D [Slide Show view]

Explanation:

.ppsx is a PowerPoint Show – it always opens as a running slide show; .pptx opens for editing.

15.  
Which Google search finds only PDF files about budget on websites ending in gov.in?

Correct Answer: B [budget filetype:pdf site:gov.in]

Explanation:

filetype: limits the file type and site: limits the domain; a minus sign would EXCLUDE pdf; quotes force an exact phrase.

16.  
Statement-basedConsider the statements about e-mail protocols:
I. POP3 usually downloads mail to one device, normally removing it from the server.
II. SMTP is the protocol a mail program uses to download mail from the server.
Which of the statements is/are correct?

Correct Answer: A [Only I]

Explanation:

SMTP sends mail; downloading is done with POP3 or IMAP.

17.  
In the seven-layer OSI reference model, which layer lies directly below the Application layer?

Correct Answer: C [Presentation]

Explanation:

Bottom to top: Physical, Data Link, Network, Transport, Session, Presentation, Application.

18.  
CalculationA MAC address is 48 bits long. How many hexadecimal digits are needed to write it?

Correct Answer: A [12]

Explanation:

One hex digit = 4 bits, so 48 ÷ 4 = 12 digits (e.g.

19.  
Statement-basedConsider the statements about malware:
I. A virus attaches itself to a host file or program in order to spread.
II. A worm cannot spread unless a user opens an infected file.
Which of the statements is/are correct?

Correct Answer: A [Only I]

Explanation:

A virus needs a host; a worm spreads on its own across networks without any user action.

20.  
Turning readable plaintext into unreadable ciphertext is encryption. Turning the ciphertext back into plaintext with the correct key is called

Correct Answer: B [decryption]

Explanation:

Decryption reverses encryption using the key; hashing is one-way and cannot be reversed.

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