Mixed Set 01 — Section B (PYQ-weighted)

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

Target mix: Networks 8 · Digital 8 · Pedagogy 7 · Business 6 · Programming/DS 6 · Fundamentals 5 · Graphics 3 · OS 3 · DBMS 2 · Web 1 · Algo 1

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Networks (8)

Q1. Which OSI layer is responsible for end-to-end reliable delivery and flow control?

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

Q2. The default port number for HTTPS is:

• (a) 21
• (b) 80
• (c) 443
• (d) 25

Q3. In IPv4, a Class C default subnet mask is:

• (a) 255.0.0.0
• (b) 255.255.0.0
• (c) 255.255.255.0
• (d) 255.255.255.255

Q4. Which device operates primarily at Layer 3 and routes packets between networks?

• (a) Hub
• (b) Repeater
• (c) Router
• (d) Passive switch (L2 only)

Q5. TCP differs from UDP mainly because TCP:

• (a) Is connectionless and unreliable
• (b) Provides connection-oriented reliable delivery
• (c) Has no port numbers
• (d) Cannot be used on the Internet

Q6. A symmetric encryption algorithm uses:

• (a) Only public keys for both encrypt and decrypt
• (b) The same secret key for encrypt and decrypt
• (c) No keys at all
• (d) Hash functions for reversible encryption

Q7. CSMA/CD is associated with traditional:

• (a) Token Ring only
• (b) Ethernet (shared medium collision detection)
• (c) Bluetooth pairing
• (d) DNS resolution

Q8. Which protocol resolves IP addresses to MAC addresses on a LAN?

• (a) ARP
• (b) FTP
• (c) SMTP
• (d) SNMP

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Digital Electronics (8)

Q9. The Boolean expression (A + \bar{A}) simplifies to:

• (a) 0
• (b) 1
• (c) A
• (d) (\bar)

Q10. A 2-to-4 decoder has how many output lines active (typically one-hot) for a valid input?

• (a) All four always ON
• (b) Exactly one (for each valid code)
• (c) Exactly two
• (d) None

Q11. The 2’s complement of 0101 (assuming 4-bit) is:

• (a) 1010
• (b) 1011
• (c) 0101
• (d) 1110

Q12. Which gate outputs 1 only when all inputs are 1?

• (a) OR
• (b) XOR
• (c) AND
• (d) NAND

Q13. A full adder has how many inputs?

• (a) 1
• (b) 2
• (c) 3
• (d) 4

Q14. In positive logic, logic-1 is represented by:

• (a) The more negative voltage level
• (b) The more positive voltage level
• (c) Always 0 V only
• (d) Open circuit only

Q15. A flip-flop is a:

• (a) Combinational circuit only
• (b) Sequential bistable memory element
• (c) Type of multiplexer
• (d) Analog amplifier only

Q16. De Morgan’s law states (\overline{A · B} =)

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

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Pedagogy (7)

Q17. Bloom’s taxonomy cognitive domain begins (lowest level) with:

• (a) Evaluation
• (b) Knowledge / Remembering
• (c) Synthesis only
• (d) Creating only (original 1956 top)

Q18. Formative assessment is mainly used to:

• (a) Certify final grades only at year-end
• (b) Provide ongoing feedback during learning
• (c) Rank teachers nationally
• (d) Replace the curriculum

Q19. Inclusive education primarily emphasizes:

• (a) Segregating children with special needs always
• (b) Educating all learners together with appropriate support
• (c) Teaching only gifted students
• (d) Removing all assessments

Q20. Constructivist approach views the learner as:

• (a) A passive recipient of facts only
• (b) An active constructor of knowledge
• (c) A blank tape for drilling only
• (d) Unimportant to pedagogy

Q21. NEP 2020 emphasizes (among other things):

• (a) Rigid early stream separation only
• (b) Multidisciplinary education and foundational literacy/numeracy
• (c) Banning all technology in schools
• (d) Ending teacher education

Q22. Microteaching is primarily meant to:

• (a) Replace school internships entirely
• (b) Practice and refine specific teaching skills in a scaled-down setting
• (c) Conduct board examinations
• (d) Design national curriculum alone

Q23. Continuous and Comprehensive Evaluation (CCE) aims to assess:

• (a) Only one final written test
• (b) Scholastic and co-scholastic aspects continuously
• (c) Only sports performance
• (d) Only attendance registers

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Business / E-Commerce / KM (6)

Q24. In accounting, the dual aspect concept means:

• (a) Every transaction has two aspects (debit and credit)
• (b) Assets are never recorded
• (c) Only cash transactions exist
• (d) Profit is always zero

Q25. B2C e-commerce refers to:

• (a) Business selling to consumers
• (b) Business selling only to government
• (c) Consumer-to-consumer auctions only
• (d) Intranet file sharing only

Q26. 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

Q27. Knowledge Management (KM) is mainly about:

• (a) Capturing, sharing and using organizational knowledge
• (b) Only hardware inventory
• (c) Replacing all databases with paper
• (d) Network cabling standards

Q28. GDP measures:

• (a) Total market value of final goods and services produced in a country in a period
• (b) Only government salaries
• (c) Only imports
• (d) Stock market index alone

Q29. EDI in e-commerce stands for:

• (a) Electronic Data Interchange
• (b) Extra Disk Interface
• (c) Encrypted Desktop Icon
• (d) End Device Identifier

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Programming / DS / OOP (6)

Q30. Time complexity of binary search on a sorted array of n elements is:

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

Q31. Which data structure follows LIFO?

• (a) Queue
• (b) Stack
• (c) Circular linked list only
• (d) Priority queue always FIFO

Q32. In OOP, encapsulation primarily means:

• (a) Bundling data with methods and restricting direct access
• (b) Using only global variables
• (c) Avoiding classes entirely
• (d) Compiling to machine code only

Q33. A queue follows:

• (a) LIFO
• (b) FIFO
• (c) Random access only like arrays always
• (d) Hash collision resolution only

Q34. In Java, which keyword prevents inheritance of a class?

• (a) static
• (b) final
• (c) void
• (d) transient

Q35. Worst-case time complexity of quicksort is:

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

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Fundamentals & Architecture (5)

Q36. 1 KB traditionally (binary) equals:

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

Q37. The CPU component that performs arithmetic and logic is the:

• (a) ALU
• (b) CU only without ALU
• (c) Hard disk
• (d) Modem

Q38. Cache memory is:

• (a) Slower than main memory and cheaper always
• (b) Faster, smaller memory closer to the CPU
• (c) Same as virtual memory swap file only
• (d) Only ROM

Q39. ASCII is a:

• (a) Character encoding standard
• (b) Network routing protocol
• (c) Database normal form
• (d) GPU shading language

Q40. Von Neumann architecture stores:

• (a) Program and data in the same memory space
• (b) Only instructions in registers forever
• (c) No programs at all
• (d) Only analog signals

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Graphics / Multimedia / Mobile (3)

Q41. Raster graphics store images as:

• (a) Mathematical curves only
• (b) A grid of pixels
• (c) Only audio samples
• (d) SQL tables

Q42. The primary colours in the RGB model are:

• (a) Red, Green, Blue
• (b) Cyan, Magenta, Yellow
• (c) Red, Yellow, Blue only for print
• (d) Black and White only

Q43. In mobile computing, 4G is associated with:

• (a) Only wired Ethernet
• (b) High-speed cellular broadband generation
• (c) Floppy disk standards
• (d) CRT refresh rates

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Operating Systems (3)

Q44. A process in the ready state is:

• (a) Waiting for I/O completion only
• (b) Waiting to be assigned the CPU
• (c) Terminated permanently
• (d) Not loaded in memory at all

Q45. Deadlock can occur when which set of conditions holds (Coffman)?

• (a) Mutual exclusion, hold-and-wait, no preemption, circular wait
• (b) Only paging
• (c) Only multitasking without sharing
• (d) Round-robin alone

Q46. In Linux, the command to list directory contents is commonly:

• (a) ls
• (b) dirprint
• (c) showall
• (d) listx

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DBMS (2)

Q47. In the relational model, a primary key:

• (a) May contain duplicate NULL rows freely
• (b) Uniquely identifies each tuple and disallows duplicates
• (c) Is always a foreign key of another table only
• (d) Stores only images

Q48. SQL command to remove a table structure is:

• (a) DELETE TABLE
• (b) DROP TABLE
• (c) REMOVE TABLE
• (d) ERASE TABLE

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Web (1)

Q49. HTML is primarily used to:

• (a) Style page layout exclusively (like CSS’s main role)
• (b) Structure content of web pages
• (c) Query relational databases
• (d) Compile Java bytecode

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Algorithms (1)

Q50. Dijkstra’s algorithm is used to find:

• (a) Minimum spanning tree only (always)
• (b) Shortest paths from a source in a weighted graph (non-negative weights)
• (c) Only sorting of integers
• (d) Huffman coding trees only

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Answer key with explanations

Q	Topic	Ans	Explanation
1	Networks	b	Transport layer (TCP) handles end-to-end reliability and flow control.
2	Networks	c	HTTPS uses TCP port 443 by default.
3	Networks	c	Class C default mask is 255.255.255.0 (/24).
4	Networks	c	Routers forward based on IP (Layer 3).
5	Networks	b	TCP is connection-oriented and reliable; UDP is not.
6	Networks	b	Symmetric crypto: one shared secret key both ways.
7	Networks	b	Classic shared Ethernet used CSMA/CD.
8	Networks	a	ARP maps IP → MAC on local networks.
9	Digital	b	(A + \bar{A} = 1) (complement law).
10	Digital	b	Standard binary decoder asserts one output line.
11	Digital	b	Invert 0101 → 1010, add 1 → 1011.
12	Digital	c	AND is 1 iff every input is 1.
13	Digital	c	Full adder inputs: A, B, Cin.
14	Digital	b	Positive logic: higher voltage = logic 1.
15	Digital	b	Flip-flop stores 1 bit; sequential element.
16	Digital	b	(\overline{A·B} = \bar{A}+\bar).
17	Pedagogy	b	Lowest cognitive level: knowledge/remember.
18	Pedagogy	b	Formative = during learning, for improvement.
19	Pedagogy	b	Inclusion = all learners with support, together.
20	Pedagogy	b	Constructivism = active knowledge construction.
21	Pedagogy	b	NEP 2020: multidisciplinary + foundational literacy.
22	Pedagogy	b	Microteaching practices discrete teaching skills.
23	Pedagogy	b	CCE covers scholastic + co-scholastic continuously.
24	Business	a	Dual aspect → debit and credit for every entry.
25	Business	a	B2C = business-to-consumer commerce.
26	Business	b	Working capital = CA − CL.
27	Business	a	KM = create, share, apply organizational knowledge.
28	Business	a	GDP = value of final goods/services in a period.
29	Business	a	EDI = Electronic Data Interchange.
30	Prog/DS	b	Binary search halves search space → O(log n).
31	Prog/DS	b	Stack = Last In First Out.
32	Prog/DS	a	Encapsulation hides internal state behind interface.
33	Prog/DS	b	Queue = First In First Out.
34	Prog/DS	b	final class cannot be subclassed in Java.
35	Prog/DS	c	Quicksort worst case (already sorted + bad pivot) O(n²).
36	Fundamentals	b	1 KiB / traditional KB = 1024 bytes.
37	Fundamentals	a	ALU performs arithmetic and logical operations.
38	Fundamentals	b	Cache is small, fast memory near CPU.
39	Fundamentals	a	ASCII encodes characters as numeric codes.
40	Fundamentals	a	Von Neumann: shared memory for code and data.
41	Graphics	b	Raster = pixel grid (bitmap).
42	Graphics	a	RGB primaries: Red, Green, Blue.
43	Graphics/Mobile	b	4G = fourth-generation cellular broadband.
44	OS	b	Ready = runnable, waiting for CPU scheduling.
45	OS	a	Four Coffman conditions characterize deadlock.
46	OS	a	ls lists files/directories in Linux/Unix.
47	DBMS	b	Primary key uniquely identifies rows; no duplicates.
48	DBMS	b	DROP TABLE removes table definition (and data).
49	Web	b	HTML marks up / structures web content.
50	Algo	b	Dijkstra: single-source shortest paths (w ≥ 0).

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Counts written

Topic area	Target	Written
Networks	8	8 (Q1–Q8)
Digital Electronics	8	8 (Q9–Q16)
Pedagogy	7	7 (Q17–Q23)
Business / E-Commerce / KM	6	6 (Q24–Q29)
Programming / DS / OOP	6	6 (Q30–Q35)
Fundamentals / Architecture	5	5 (Q36–Q40)
Graphics / Multimedia / Mobile	3	3 (Q41–Q43)
Operating Systems	3	3 (Q44–Q46)
DBMS	2	2 (Q47–Q48)
Web	1	1 (Q49)
Algorithms	1	1 (Q50)
Total	50	50

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