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1.
Ravi received an SMS: 'Your account will be blocked today. Update PAN at this link.' He clicked and entered his net-banking password. Which attack is this?
Correct Answer: E [Smishing]
Explanation:
Fake link by SMS = smishing.
2.
Meena's phone suddenly lost network; soon after, OTP-based transfers were made from her account. The most likely attack is:
Correct Answer: C [SIM swap]
Explanation:
A duplicate SIM in the fraudster's hands receives her OTPs; her own SIM stops working.
3.
A small device fixed on an ATM card slot copied customers' card data. This is:
Correct Answer: A [Skimming]
Explanation:
Skimmers copy card data at ATMs/POS.
4.
On an open café Wi-Fi, an attacker secretly reads and alters messages between a user and a website. This is:
Correct Answer: C [Man-in-the-middle]
Explanation:
Interception between two parties = MITM.
5.
Consider the following statements about digital signatures:
I. They are created with the sender's private key.
II. They provide integrity and non-repudiation.
III. They keep the content of the message secret from everyone else.
Which of the statements given above is/are correct?
I. They are created with the sender's private key.
II. They provide integrity and non-repudiation.
III. They keep the content of the message secret from everyone else.
Which of the statements given above is/are correct?
Correct Answer: A [Only I and II]
Explanation:
I and II true; III false – a signature proves origin and integrity; secrecy needs encryption with the receiver's public key.
6.
Match the section of the IT Act, 2000 with its subject:
List I: (a) 66C; (b) 66E; (c) 66F; (d) 43
List II: (1) identity theft; (2) damage to a computer; (3) cyber terrorism; (4) violation of privacy
List I: (a) 66C; (b) 66E; (c) 66F; (d) 43
List II: (1) identity theft; (2) damage to a computer; (3) cyber terrorism; (4) violation of privacy
Correct Answer: D [a-1, b-4, c-3, d-2]
Explanation:
66C identity theft; 66E privacy; 66F cyber terrorism; 43 damage to a computer.
7.
Match the defence with its role:
List I: (a) Honeypot; (b) VPN; (c) Sandbox; (d) IDS
List II: (1) decoy system; (2) detects and alerts; (3) encrypted tunnel; (4) isolated environment
List I: (a) Honeypot; (b) VPN; (c) Sandbox; (d) IDS
List II: (1) decoy system; (2) detects and alerts; (3) encrypted tunnel; (4) isolated environment
Correct Answer: A [a-1, b-3, c-4, d-2]
Explanation:
Honeypot decoy; VPN tunnel; sandbox isolation; IDS detects and alerts.
8.
Match the event with the goal of security it harms:
List I: (a) DDoS flood on the net-banking server; (b) Eavesdropping on an unencrypted login; (c) Changing the amount in a payment message
List II: (1) confidentiality; (2) integrity; (3) availability
List I: (a) DDoS flood on the net-banking server; (b) Eavesdropping on an unencrypted login; (c) Changing the amount in a payment message
List II: (1) confidentiality; (2) integrity; (3) availability
Correct Answer: B [a-3, b-1, c-2]
Explanation:
Flood → availability; reading → confidentiality; changing → integrity.
9.
A bank has 50 branches. How many keys in total are needed if each pair of branches shares its own symmetric key, compared with each branch having its own public–private key pair (asymmetric, count every key)?
Correct Answer: E [1,225 versus 100]
Explanation:
Symmetric 50C2 = 1,225 keys; asymmetric 50 × 2 = 100 keys.
10.
An 8-character password may use all 62 letters and digits instead of only the 26 lower-case letters. The number of possible passwords becomes about how many times larger?
Correct Answer: E [about 1,045 times]
Explanation:
(62/26)⁸ = 2.3846⁸ ≈ 1,045.
11.
Consider the following statements:
I. A firewall can remove a virus from an infected file.
II. Signature-based antivirus must be updated regularly to detect new malware.
III. A rootkit hides itself and gives an attacker hidden administrator-level control.
Which of the statements given above is/are correct?
I. A firewall can remove a virus from an infected file.
II. Signature-based antivirus must be updated regularly to detect new malware.
III. A rootkit hides itself and gives an attacker hidden administrator-level control.
Which of the statements given above is/are correct?
Correct Answer: E [Only II and III]
Explanation:
I false – that is antivirus work; II and III true.
12.
A website shows a padlock and uses HTTPS. What does this prove?
Correct Answer: B [The connection between the browser and the site is encrypted]
Explanation:
HTTPS shows encryption with a certificate, not honesty.
13.
Which of these must NEVER be shared with anyone, even to receive money through UPI?
Correct Answer: A [UPI PIN]
Explanation:
The PIN is entered only to PAY; receiving needs no PIN.
14.
Odd one out:
Correct Answer: D [RSA]
Explanation:
RSA is asymmetric; the others are symmetric ciphers.
15.
Stretch – Using Caesar shift 3, decrypt YDXOW.
Correct Answer: C [VAULT]
Explanation:
Y→V, D→A, X→U, O→L, W→T.
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