Mixed Set 02 — Section B (PYQ-weighted)

50 MCQs · DSSSB TGT CS style · Negative marking −0.25 · Answer key with explanations at end.

Target mix: Networks 7 · Digital 6 · Pedagogy 6 · Business 5 · Programming/DS 5 · Fundamentals 4 · Graphics 4 · OS 4 · DBMS 3 · Web 2 · Algo 2 · Math 1 · SE 1

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Networks (7)

Q1. Which OSI layer deals with MAC addressing and framing?

• (a) Network
• (b) Data Link
• (c) Transport
• (d) Application

Q2. Default port for HTTP is:

• (a) 21
• (b) 25
• (c) 80
• (d) 443

Q3. Private IPv4 range 10.0.0.0/8 belongs to:

• (a) Public Class A only routable globally without NAT
• (b) RFC 1918 private addressing
• (c) Multicast Class D
• (d) Loopback only

Q4. UDP is preferred over TCP when:

• (a) Absolute reliability is mandatory
• (b) Low overhead / speed matters more than guaranteed delivery
• (c) Connection setup is always required
• (d) Sequencing acknowledgements are mandatory

Q5. A firewall primarily:

• (a) Speeds up CPU clocks
• (b) Filters network traffic based on rules
• (c) Replaces all antivirus
• (d) Compiles source code

Q6. DNS primarily resolves:

• (a) MAC to IP only
• (b) Domain names to IP addresses
• (c) Ports to processes only
• (d) Files to inodes

Q7. Which protocol is used to send email from client to server?

• (a) POP3 only for sending
• (b) SMTP
• (c) FTP
• (d) SNMP

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Digital Electronics (6)

Q8. The output of a 2-input XOR is 1 when:

• (a) Both inputs are 1
• (b) Both inputs are 0
• (c) Inputs are different
• (d) Always

Q9. De Morgan: (\overline{A+B}) equals:

• (a) (\bar{A}+\bar)
• (b) (\bar{A}\cdot\bar)
• (c) (A\cdot B)
• (d) (A+B)

Q10. A half adder has:

• (a) Sum and Carry outputs for two bits
• (b) Three inputs including Cin
• (c) Only OR gates
• (d) No sum output

Q11. Binary of decimal 13 is:

• (a) 1101
• (b) 1110
• (c) 1011
• (d) 1001

Q12. A flip-flop stores:

• (a) 1 bit
• (b) 8 bits always
• (c) An entire file
• (d) No state

Q13. NAND is called universal because:

• (a) It can implement any Boolean function
• (b) It is only used in clocks
• (c) It cannot make NOT
• (d) It is slower than nothing always

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Pedagogy (6)

Q14. In Bloom’s revised taxonomy, “evaluate” is above:

• (a) Create
• (b) Analyze
• (c) Remember only as highest
• (d) Nothing

Q15. Formative assessment is best described as:

• (a) End-of-year certification only
• (b) Ongoing feedback to improve learning
• (c) Only board ranking
• (d) Teacher salary review

Q16. Vygotsky is associated with:

• (a) Operant conditioning
• (b) Zone of Proximal Development
• (c) Classical conditioning only
• (d) Instinct theory only

Q17. Inclusive education emphasises:

• (a) Segregation of all CWSN always
• (b) Learning together with support in mainstream settings
• (c) Excluding slow learners
• (d) Only gifted tracks

Q18. Microteaching helps teachers practise:

• (a) Discrete teaching skills in a reduced setting
• (b) Only school administration
• (c) Only sports coaching
• (d) Avoiding lesson plans

Q19. NEP 2020 stresses:

• (a) Rote learning as sole method
• (b) Foundational literacy/numeracy and multidisciplinary learning
• (c) Ban on digital tools
• (d) Ending school education at Class 5 only

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Business / E-Commerce / KM (5)

Q20. Dual aspect concept means:

• (a) Every debit has a corresponding credit
• (b) Only cash transactions
• (c) No ledger needed
• (d) Profit equals loss always

Q21. B2B e-commerce is between:

• (a) Business and consumer only
• (b) Two businesses
• (c) Government and citizen only
• (d) Student and teacher only

Q22. Working capital is generally:

• (a) Fixed assets − long-term liabilities
• (b) Current assets − current liabilities
• (c) Only cash in hand forever
• (d) Share capital only

Q23. Knowledge Management primarily aims to:

• (a) Create, share and use organisational knowledge
• (b) Only manufacture hardware
• (c) Replace all employees
• (d) Ignore tacit knowledge forever

Q24. EDI stands for:

• (a) Electronic Data Interchange
• (b) Extra Digital Image
• (c) Easy Disk Index
• (d) External Device Input

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Programming / DS / OOP (5)

Q25. Stack follows:

• (a) FIFO
• (b) LIFO
• (c) Random
• (d) Priority only always

Q26. Queue follows:

• (a) LIFO
• (b) FIFO
• (c) FILO identical to stack always naming
• (d) No order

Q27. Encapsulation in OOP means:

• (a) Hiding internal details behind an interface
• (b) Multiple inheritance only
• (c) Deleting classes
• (d) Only operator overloading

Q28. Time complexity of binary search is:

• (a) O(n)
• (b) O(log n)
• (c) O(n²)
• (d) O(n!)

Q29. In Java, a final class:

• (a) Can be freely subclassed
• (b) Cannot be subclassed
• (c) Cannot have methods
• (d) Must be abstract

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Fundamentals / Architecture (4)

Q30. ALU stands for:

• (a) Arithmetic Logic Unit
• (b) Application Layer Utility
• (c) Array Linked Union
• (d) Analog Light Unit

Q31. 1 KB (traditional binary) equals:

• (a) 1000 bytes
• (b) 1024 bytes
• (c) 100 bytes
• (d) 512 bytes

Q32. Cache memory is:

• (a) Slow and large far from CPU
• (b) Small, fast memory close to CPU
• (c) Only magnetic tape
• (d) Only optical disc

Q33. Von Neumann architecture stores:

• (a) Programs and data in separate exclusive memories only always
• (b) Programs and data in a shared memory space
• (c) No instructions
• (d) Only graphics

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Graphics / Multimedia / Mobile (4)

Q34. Raster graphics are based on:

• (a) Pixels
• (b) Only Bezier curves without pixels
• (c) Only SQL tables
• (d) Only packets

Q35. RGB model is used mainly for:

• (a) Print CMYK replacement only
• (b) Display / additive colour on screens
• (c) Only sound
• (d) Only networking

Q36. MP3 is associated with:

• (a) Audio compression
• (b) Spreadsheet macros
• (c) CPU registers
• (d) Database keys

Q37. Bluetooth is typically:

• (a) Long-haul WAN fibre
• (b) Short-range wireless PAN technology
• (c) Satellite TV only
• (d) Wired Ethernet only

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Operating Systems (4)

Q38. A process in blocked/waiting state is typically:

• (a) Waiting for an event/I/O
• (b) Running on CPU always
• (c) Terminated
• (d) Not yet admitted

Q39. Deadlock’s four necessary conditions include:

• (a) Mutual exclusion and circular wait (among others)
• (b) Only multitasking
• (c) Only GUI
• (d) Only paging

Q40. Linux command to list files:

• (a) ls
• (b) pwd creates files
• (c) rm lists always
• (d) chmod lists always

Q41. Virtual memory allows:

• (a) Execution with address space backed by secondary storage
• (b) No disk ever
• (c) Only ROM programs
• (d) Disabling MMU always

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DBMS (3)

Q42. Primary key must be:

• (a) Unique and not null
• (b) Duplicate allowed
• (c) Always nullable
• (d) Only floating text

Q43. SQL SELECT is primarily:

• (a) DDL
• (b) DML / query
• (c) DCL only
• (d) Hardware interrupt

Q44. 2NF removes:

• (a) Partial dependency on a composite key
• (b) Atomicity requirement of 1NF
• (c) All keys
• (d) All foreign keys

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Web / .NET (2)

Q45. HTML is used to:

• (a) Structure web content
• (b) Only style colours without markup
• (c) Only query SQL
• (d) Only schedule CPU

Q46. CLR in .NET means:

• (a) Common Language Runtime
• (b) Cascading Layout Rule
• (c) Central Linux Router
• (d) Compressed Link Repo

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Algorithms (2)

Q47. Worst-case of quicksort is:

• (a) O(n log n)
• (b) O(n²)
• (c) O(log n)
• (d) O(1)

Q48. Dijkstra’s algorithm computes:

• (a) MST only always
• (b) Single-source shortest paths (non-negative weights)
• (c) Only sorting
• (d) Only hashing

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Math / Numerical (1)

Q49. Mean of 4, 8, 12 is:

• (a) 6
• (b) 8
• (c) 10
• (d) 12

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Software Engineering (1)

Q50. Waterfall model is best described as:

• (a) Strict sequential phases
• (b) Continuous unstructured chaos only
• (c) No documentation ever
• (d) Only daily customer demos mandatory

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Answer key with explanations

Q	Topic	Ans	Explanation
1	Networks	b	Data Link handles framing and MAC.
2	Networks	c	HTTP default port 80.
3	Networks	b	10.0.0.0/8 is RFC 1918 private.
4	Networks	b	UDP trades reliability for speed/overhead.
5	Networks	b	Firewalls filter by policy rules.
6	Networks	b	DNS maps names → IP.
7	Networks	b	SMTP sends mail.
8	Digital	c	XOR is 1 for unequal inputs.
9	Digital	b	(\overline{A+B}=\bar\bar{B}).
10	Digital	a	Half adder: Sum + Carry, two inputs.
11	Digital	a	8+4+1 = 13 → 1101.
12	Digital	a	Flip-flop stores one bit.
13	Digital	a	NAND is functionally complete.
14	Pedagogy	b	Evaluate sits above Analyze (below Create).
15	Pedagogy	b	Formative = during learning, for improvement.
16	Pedagogy	b	Vygotsky → ZPD / social constructivism.
17	Pedagogy	b	Inclusion = common setting + support.
18	Pedagogy	a	Microteaching drills specific skills.
19	Pedagogy	b	NEP: FLN + multidisciplinary thrust.
20	Business	a	Dual aspect → debit–credit equality.
21	Business	b	B2B = business-to-business.
22	Business	b	WC ≈ CA − CL.
23	Business	a	KM = create/share/apply knowledge.
24	Business	a	EDI = Electronic Data Interchange.
25	Prog/DS	b	Stack = LIFO.
26	Prog/DS	b	Queue = FIFO.
27	Prog/DS	a	Encapsulation hides internals.
28	Prog/DS	b	Binary search O(log n).
29	Prog/DS	b	final class cannot be extended.
30	Fundamentals	a	ALU = Arithmetic Logic Unit.
31	Fundamentals	b	Classic KB = 1024 bytes.
32	Fundamentals	b	Cache is small & fast near CPU.
33	Fundamentals	b	Von Neumann: shared program/data memory.
34	Graphics	a	Raster = pixel grid.
35	Graphics	b	RGB additive for displays.
36	Graphics	a	MP3 = compressed audio.
37	Mobile	b	Bluetooth = short-range PAN.
38	OS	a	Blocked/waiting for event/I/O.
39	OS	a	Coffman conditions include ME & circular wait.
40	OS	a	ls lists directory entries.
41	OS	a	VM uses secondary storage backing.
42	DBMS	a	PK unique + NOT NULL.
43	DBMS	b	SELECT queries data (DML family).
44	DBMS	a	2NF removes partial dependency.
45	Web	a	HTML structures content.
46	Web/.NET	a	CLR = Common Language Runtime.
47	Algo	b	Quicksort worst O(n²).
48	Algo	b	Dijkstra: shortest paths, w ≥ 0.
49	Math	b	(4+8+12)/3 = 8.
50	SE	a	Waterfall = sequential lifecycle.

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Counts

Topic area	Target	Written
Networks	7	7 (Q1–Q7)
Digital Electronics	6	6 (Q8–Q13)
Pedagogy	6	6 (Q14–Q19)
Business / E-Commerce / KM	5	5 (Q20–Q24)
Programming / DS / OOP	5	5 (Q25–Q29)
Fundamentals / Architecture	4	4 (Q30–Q33)
Graphics / Multimedia / Mobile	4	4 (Q34–Q37)
Operating Systems	4	4 (Q38–Q41)
DBMS	3	3 (Q42–Q44)
Web / .NET	2	2 (Q45–Q46)
Algorithms	2	2 (Q47–Q48)
Math / Stats / Numerical	1	1 (Q49)
Software Engineering	1	1 (Q50)
Total	50	50