SSC CGL Computer – Cyber Security & Abbreviations – Exam-Level Drill

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SSC CGL Computer – Cyber Security & Abbreviations – Exam-Level Drill – 15 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.  
An infected document on a pen drive damages files on every computer where someone opens it. Which malware is this?

Correct Answer: A [Virus]

Explanation:

Host file + user opens it → virus.

2.  
A Certifying Authority (CA) issues a digital certificate to a company. With which key does the CA sign the certificate?

Correct Answer: B [The CA's private key]

Explanation:

The signer always uses its own private key; anyone checks the certificate with the CA's public key.

3.  
A 6-character password may use small letters (a–z) and digits (0–9), with repeats allowed. How many passwords are possible?

Correct Answer: D [2,176,782,336]

Explanation:

36 choices per place: 36⁶ = 2,176,782,336.

4.  
Match the followingMatch the attack with what happens:
P. Spoofing Q. Man-in-the-middle R. SQL injection S. Shoulder surfing
1. database commands typed into a web form 2. attacker secretly sits between two parties 3. the sender's identity is faked 4. watching someone type a PIN

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

Explanation:

Spoofing – fake sender; MITM – in between; SQL injection – database; shoulder surfing – watching.

5.  
Assertion–Reason
A: A fingerprint plus a PIN is two-factor authentication.
R: Two-factor authentication needs proofs of two different kinds.

Correct Answer: A [Both A and R are true and R explains A]

Explanation:

Fingerprint = something you are; PIN = something you know – two kinds, so R explains A.

6.  
Statement-basedWhich of the following is/are correct?
I. CERT-In's mandate is under section 70B of the IT Act, 2000.
II. Identity theft is listed under section 66C of the IT Act in a PIB release of MeitY.

Correct Answer: B [Both I and II]

Explanation:

Both as read on the PIB pages (2026 and 2022).

7.  
Under the SSC CGL 2026 notice, what is the maximum percentage of errors allowed in DEST for an unreserved (UR) candidate?

Correct Answer: C [20%]

Explanation:

Para 16.2: UR 20%, OBC/EWS 25%, others 30%.

8.  
A Caesar-shift-3 message reads VHFXUH. What is the plaintext?

Correct Answer: D [SECURE]

Explanation:

Shift each letter back 3: V→S, H→E, F→C …

9.  
In CAPTCHA, the letters 'P' and 'T' stand for:

Correct Answer: A [Public, Turing]

Explanation:

Completely Automated Public Turing test to tell Computers and Humans Apart.

10.  
Two-quantity comparison
Quantity I: number of possible 6-digit OTPs
Quantity II: number of possible 4-letter codes from A–Z (repeats allowed)

Correct Answer: A [Quantity I > Quantity II]

Explanation:

QI = 10,00,000; QII = 26⁴ = 4,56,976 → QI > QII.

11.  
A SHA-256 hash is written in hexadecimal. How many hex characters does it have?

Correct Answer: B [64]

Explanation:

256 bits ÷ 4 bits per hex digit = 64.

12.  
Odd one outWhich of these is NOT a preventive measure against malware?

Correct Answer: A [Turning off automatic security updates]

Explanation:

Updates close known holes – turning them off helps attackers.

13.  
Using the common convention of 5 key depressions = 1 word, about 2,000 key depressions in 15 minutes is roughly how many words per minute?

Correct Answer: C [27]

Explanation:

2,000 ÷ 5 = 400 words; 400 ÷ 15 ≈ 27.

14.  
A password of 8 small letters is lengthened to 10 small letters. By what factor does the number of possible passwords grow?

Correct Answer: D [676]

Explanation:

26² = 676 – each extra letter multiplies by 26.

15.  
Which single step best limits the damage if ransomware encrypts all files on an office computer?

Correct Answer: B [Having a recent backup kept separately]

Explanation:

With a separate backup the files can be restored without paying.

➤ 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)
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