SSC CGL Computer – Mock Test M1 – Computer Knowledge Module
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QI = 443; QII = 4 × 110 = 440 → QI > QII.
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SSC CGL Computer – Mock Test M1 – Computer Knowledge Module – 20 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.
Japan's Fifth Generation Computer Systems project, aimed at artificial intelligence and logic programming, began in:
Correct Answer: C [1982]
Explanation:
The FGCS project started in 1982; 1971 is the Intel 4004 year.
2.
Of these scales of integration, which one puts the largest number of components on a single chip?
Correct Answer: D [ULSI]
Explanation:
SSI < MSI < LSI < VLSI < ULSI (Ultra Large Scale Integration).
3.
A signal takes 3 nanoseconds to cross a chip. How many picoseconds is that?
Correct Answer: B [3,000 ps]
Explanation:
1 ns = 10⁻⁹ s = 1,000 ps, so 3 ns = 3,000 ps.
4.
Each byte of a 1 MB (2²⁰ bytes) memory has its own address. How many lines must the address bus have to reach every byte?
Correct Answer: A [20]
Explanation:
n lines reach 2ⁿ addresses; 2²⁰ bytes need 20 lines.
5.
An old graphics mode can show only 256 colours at a time. How many bits of colour depth does each pixel use?
Correct Answer: A [8]
Explanation:
b bits give 2ᵇ colours, and 2⁸ = 256.
6.
A laptop screen has a resolution of 1366 × 768. How many pixels does it have in all?
Correct Answer: D [10,49,088]
Explanation:
Resolution = pixels across × pixels down: 1366 × 768 = 10,49,088 (about 1 million).
7.
The platters of a server drive turn 10,000 times a minute. On average, how long does the drive wait for the wanted sector to come under the head?
Correct Answer: B [3 ms]
Explanation:
Average latency = half a turn: 60 ÷ 10,000 s = 6 ms per turn, half = 3 ms.
8.
A full backup is taken every Sunday and a differential backup every other evening. The disk fails on Thursday morning. Which backups are needed to restore everything?
Correct Answer: C [Sunday's full backup and Wednesday's differential backup]
Explanation:
A differential holds every change since the last full backup, so the latest one is enough with the full backup.
9.
A memory chip has 12 address lines and stores a 16-bit word at each address. What is its capacity?
Correct Answer: C [8 KB]
Explanation:
Locations = 2¹² = 4,096; capacity = 4,096 × 16 bits = 65,536 bits = 8,192 bytes = 8 KB.
10.
What is (2B)₁₆ + (17)₈ written in decimal?
Correct Answer: A [58]
Explanation:
(2B)₁₆ = 2 × 16 + 11 = 43; (17)₈ = 8 + 7 = 15; 43 + 15 = 58.
11.
Read as an 8-bit 2's-complement number, what decimal value does 11110110 stand for?
Correct Answer: D [−10]
Explanation:
Sign bit 1 → negative. Flip 11110110 → 00001001, add 1 → 00001010 = 10, so the value is −10.
12.
Capital 'A' has ASCII code 65. Which character has ASCII code 72?
Correct Answer: B [H]
Explanation:
Capitals run in order from 65: A 65, B 66 … H 72.
13.
Statement-basedWhich is/are correct?
I. Every logic circuit can be built from NAND gates alone.
II. An XOR gate gives 1 when both inputs are equal.
I. Every logic circuit can be built from NAND gates alone.
II. An XOR gate gives 1 when both inputs are equal.
Correct Answer: B [Only I]
Explanation:
NAND is a universal gate; XOR gives 1 only when the inputs differ.
14.
Arrange in orderA process that never waits for input or output passes through which states, in order?
Correct Answer: A [New → Ready → Running → Terminated]
Explanation:
It is admitted (ready), dispatched (running) and exits; 'waiting' comes only with I/O.
15.
Four jobs arrive together with CPU bursts 7, 3, 5 and 1 ms. What is the average waiting time under SJF (non-pre-emptive)?
Correct Answer: D [3.5 ms]
Explanation:
Order 1, 3, 5, 7 → waits 0, 1, 4, 9 → 14 ÷ 4 = 3.5 ms.
16.
In a Windows file search, which of these files matches the pattern rep*.d?cx?
Correct Answer: C [report_v2.docx]
Explanation:
rep* = 'rep' then anything; d?cx = d, any one character, c, x.
17.
Arrange in orderArrange by year of first release: P. Linux kernel Q. MS-DOS R. Windows 1.0
Correct Answer: A [Q → R → P]
Explanation:
MS-DOS 1981 → Windows 1.0 1985 → Linux kernel 1991.
18.
A cell contains =-3^2*2-1. Following Excel's order of operations, the cell displays:
Correct Answer: C [17]
Explanation:
Negation before ^: (−3)² = 9; 9 × 2 = 18; 18 − 1 = 17.
19.
Fill in the blankIn the CIA triad of information security, C stands for ______.
Correct Answer: B [Confidentiality]
Explanation:
Confidentiality, Integrity, Availability.
20.
Two-quantity comparison
Quantity I: the default port number of HTTPS
Quantity II: four times the default port number of POP3
Quantity I: the default port number of HTTPS
Quantity II: four times the default port number of POP3
Correct Answer: A [Quantity I > Quantity II]
Explanation:
QI = 443; QII = 4 × 110 = 440 → QI > QII.
➤ 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)
Here you get the answer with a one-line explanation. 672 original questions with answer key and explanations · notes, figures, shortcut keys and memory aids · practice sets + 3 Computer Knowledge mock tests
Get the book – ₹149 More quizzes
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