SSC CGL Mock – Computer Knowledge Tests 1–5 – Test 4 · Exam level

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SSC CGL Mock – Computer Knowledge Tests 1–5 – Test 4 · 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.  
Match the followingMatch the memory with its feature:
P. Cache Q. RAM R. ROM S. Hard disk
1. volatile main memory that holds running programs 2. very fast memory between the CPU and RAM 3. permanent secondary storage 4. non-volatile memory that holds the start-up firmware

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

Explanation:

Cache → fast buffer next to the CPU; RAM → volatile main memory; ROM → non-volatile firmware; hard disk → secondary storage.

2.  
A single chip that contains two or more independent processing units is called a

Correct Answer: B [multi-core processor]

Explanation:

A multi-core processor has two or more cores on one chip, so it can run several tasks in parallel.

3.  
CalculationA CPU has a word length of 32 bits. How many bytes can it handle at a time?

Correct Answer: A [4]

Explanation:

1 byte = 8 bits, so 32 ÷ 8 = 4 bytes.

4.  
CalculationWith a colour depth of 24 bits per pixel, how many different colours can one pixel show?

Correct Answer: C [1,67,77,216]

Explanation:

b bits give 2ᵇ colours: 2 24 = 1,67,77,216.

5.  
Statement-basedConsider the statements about printers:
I. Laser printers use toner and a drum.
II. Inkjet printers fuse toner on to the paper with heat.
Which of the statements is/are correct?

Correct Answer: A [Only I]

Explanation:

Laser printers fuse toner with heat using a drum; inkjets spray drops of liquid ink.

6.  
An EPROM chip is erased by

Correct Answer: D [exposing it to ultraviolet light]

Explanation:

EPROM is erased by UV light; EEPROM is erased electrically byte by byte; mask ROM cannot be changed.

7.  
CalculationHow many 700 MB CDs are needed to store 4 GB of data? (1 GB = 1,024 MB)

Correct Answer: A [6]

Explanation:

4 × 1,024 = 4,096 MB; 4,096 ÷ 700 = 5.85, so 6 CDs (a part-filled disc still counts).

8.  
USB 2.0 (Hi-Speed) has a maximum signalling rate of

Correct Answer: D [480 Mbit/s]

Explanation:

USB 1.1 = 12 Mbit/s, USB 2.0 = 480 Mbit/s, USB 3.0 (3.2 Gen 1) = 5 Gbit/s, USB 3.2 Gen 2 = 10 Gbit/s.

9.  
Match the followingMatch the Windows shortcuts with what they do:
P. Win + D Q. Win + R R. Win + I S. Win + Tab
1. opens Settings 2. opens Task View 3. shows or hides the desktop 4. opens the Run dialog box

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

Explanation:

Win + D desktop; Win + R Run; Win + I Settings; Win + Tab Task View.

10.  
To select several files that are NOT next to each other in File Explorer, you click each one while holding

Correct Answer: C [Ctrl]

Explanation:

Ctrl + click adds single items; Shift + click selects a continuous range.

11.  
Which file extension marks a macro-enabled Excel workbook?

Correct Answer: A [.xlsm]

Explanation:

In Office file names x = macro-free and m = macro-enabled: .xlsx workbook, .xlsm macro-enabled workbook.

12.  
Formula outputCells A1 to A6 contain, in order: 5, Delhi, 12, (empty), 7, x. What does =COUNT(A1:A6) return?

Correct Answer: B [3]

Explanation:

COUNT counts only cells with numbers (3); COUNTA would count all non-empty cells (5).

13.  
Formula outputCell B2 holds 39. What does =IF(B2>=40,"Pass","Fail") return?

Correct Answer: C [Fail]

Explanation:

39 ≥ 40 is false, so IF returns the third argument, "Fail".

14.  
During a PowerPoint slide show, what does pressing the B key do?

Correct Answer: D [Turns the screen black until you press it again]

Explanation:

B (or full stop) = black screen; W (or comma) = white screen; Esc ends the show.

15.  
Situation-basedA caller says he is from your bank and asks for the OTP you have just received, 'to stop your card being blocked'. What should you do?

Correct Answer: D [Not share it; end the call and contact the bank on its official number]

Explanation:

An OTP is a secret for you alone; anyone who asks for it on a call is a fraudster – contact the bank yourself.

16.  
IMPS, a mode of instant fund transfer in India, stands for

Correct Answer: B [Immediate Payment Service]

Explanation:

IMPS = Immediate Payment Service, for instant bank transfers through mobile, internet banking and ATMs.

17.  
CalculationIn a full mesh topology every device has a direct link to every other device. How many links are needed for 12 devices?

Correct Answer: A [66]

Explanation:

Links = n(n − 1)/2 = 12 × 11/2 = 66.

18.  
What does DHCP do on a network?

Correct Answer: C [assigns IP addresses to devices automatically]

Explanation:

DHCP (Dynamic Host Configuration Protocol) assigns IP addresses; DNS resolves names, FTP moves files, SMTP sends mail.

19.  
When typing a password on a shared computer, which of these reduces the risk from a keylogger?

Correct Answer: D [an on-screen (virtual) keyboard]

Explanation:

A keylogger records key presses; clicking an on-screen keyboard (and using 2FA) reduces the risk.

20.  
Flooding a website with traffic from many computers at once, so that genuine users cannot reach it, is called

Correct Answer: B [a DDoS attack]

Explanation:

DDoS = Distributed Denial of Service: many machines (often a botnet) overload the target.

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