Laboratory Attendant — Tagged Answers & Explanations (Set-A)

Post: Laboratory Attendant, Home Department, J&K Exam: JKSSB OMR Written Exam held 10.05.2026 (Advt. No. 06 of 2025, Item No. 24) Booklet Series: A • Total Items: 120 • Marks: 120 • Time: 120 min • Negative marking: ¼ per wrong answer

Each question is tagged with its Syllabus Section → sub-topic, followed by the official answer key (Series A) and a short explanation. No questions were discarded/revised in the provisional key.

Legend: ✅ = correct answer per key.

Section map (paper order ≠ syllabus order): Q1–20 General English · Q21–40 Mathematics · Q41–60 Mental Ability · Q61–80 General Awareness · Q81–100 General Science · Q101–120 Computer Applications

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GENERAL ENGLISH (Q1–Q20)

Q1. Synonym of "Persiflage"

• Tag: English → Synonyms
• Answer: B) Banter ✅ — Persiflage = light, teasing talk → banter.

Q2. Synonym of "Recalcitrant"

• Tag: English → Synonyms
• Answer: C) Rebellious ✅ — Recalcitrant = defiant/uncooperative → rebellious.

Q3. Antonym of "Succinct"

• Tag: English → Antonyms
• Answer: C) Long-winded ✅ — Succinct = brief; opposite is long-winded (laconic/pithy/concise are synonyms).

Q4. Antonym of "Perturbed"

• Tag: English → Antonyms
• Answer: A) Calm ✅ — Perturbed = anxious; opposite is calm.

Q5. Rearrange (Ancient mythologies…)

• Tag: English → Rearranging jumbled sentences
• Answer: A) SQRP ✅ — "…have transcended time (S), influencing modern literature… (Q), preserving cultural traditions… (R), while adapting to contemporary interpretations (P)."

Q6. Rearrange (Bees paragraph)

• Tag: English → Rearranging jumbled sentences
• Answer: C) II-I-III-IV ✅ — Bees are essential (II) → pollinate plants (I) → population declining (III) → reasons habitat loss/pesticides (IV).

Q7. Direct speech form

• Tag: English → Narration
• Answer: D) She said to me, "Why were you smoking today?" ✅ — Correct back-conversion of the reported question.

Q8. Idiom "give a piece of one's mind"

• Tag: English → Idioms and phrases
• Answer: B) To rebuke someone strongly ✅ — Means to scold/criticise sharply.

Q9. One word — "wanders and lives by begging"

• Tag: English → Pairs of words / vocabulary
• Answer: D) Vagrant ✅ — A vagrant wanders and begs (itinerant merely travels).

Q10. Indirect speech form

• Tag: English → Narration
• Answer: C) He greeted his friend and asked what he could do for him ✅ — Correct reporting of greeting + question.

Q11. Why revolutions are a rupture (comprehension)

• Tag: English → Comprehension
• Answer: B) Competing paradigms redefine questions and methods, making continuity impossible ✅ — Matches the passage's gestalt-switch idea.

Q12. Voice of "Anomalies are dismissed…"

• Tag: English → Comprehension (Active/Passive Voice)
• Answer: C) Passive voice ✅ — Subject receives the action ("are dismissed").

Q13. Clause type — "that cannot be explained…"

• Tag: English → Comprehension (Clauses)
• Answer: B) Relative clause ✅ — Introduced by "that", modifying "anomalies".

Q14. Spot the error

• Tag: English → Editing / Proof Reading
• Answer: D) piece by logic piece ✅ — Awkward/ungrammatical; should be "piece by piece".

Q15. Segment with grammatical error

• Tag: English → Editing / Proof Reading
• Answer: B) (I) She quick finished ✅ — Adverb needed → "quickly".

Q16. Correct spelling

• Tag: English → Spellings
• Answer: C) colloquial ✅

Q17. Fill the blank — "Despite the ___ challenges"

• Tag: English → Pairs of words / vocabulary
• Answer: A) formidable ✅ — Only "formidable" fits "despite … challenges".

Q18. Type of pronoun — "myself"

• Tag: English → Pronouns
• Answer: D) reflexive ✅ — "myself" is a reflexive pronoun.

Q19. Word with a spelling mistake

• Tag: English → Spellings
• Answer: B) Conflagaration ✅ — Correct spelling is "conflagration".

Q20. Substitute "so many examples"

• Tag: English → Sentence correction
• Answer: A) some more examples of ✅ — Correct idiomatic replacement.

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MATHEMATICS (Q21–Q40)

Q21. A.P. — find 9th term

• Tag: Maths → Progression
• Answer: D) 26 ✅ — 2a+5d=19, 2a+6d=22 → d=3, a=2 → a+8d = 26.

Q22. Compare √5+√3 and √6+√2

• Tag: Maths → BODMAS / surds
• Answer: A) √5+√3 > √6+√2 ✅ — Squaring: 8+2√15 > 8+2√12.

Q23. Cone from hemisphere — remaining %

• Tag: Maths → Mensuration
• Answer: B) 50% ✅ — Cone = ⅓πr³, hemisphere = ⅔πr³ → remaining ⅓πr³ = 50%.

Q24. Minimum of x²+4xy+6y²−4y+4

• Tag: Maths → Linear/quadratic algebra
• Answer: C) 2 ✅ — Minimised at x=−2, y=1 → value 2.

Q25. Cylinder volume (h+r=46, TSA=6072)

• Tag: Maths → Mensuration
• Answer: D) 11025π ✅ — r=21, h=25 → V = πr²h = 11025π.

Q26. Two cones → sphere diameter

• Tag: Maths → Mensuration (conversion)
• Answer: A) 4.2 ✅ — Total cone volume = sphere volume → R=2.1 → diameter 4.2 cm.

Q27. Overall profit % (40 pieces)

• Tag: Maths → Profit and loss
• Answer: C) 16.25% ✅ — SP = 2100 + 225 = 2325 on CP 2000 → profit 16.25%.

Q28. Sum from CI−SI = 433.50 @17%, 2 yrs

• Tag: Maths → Simple/Compound interest
• Answer: B) 15,000 ✅ — P(0.17)² = 433.50 → P = 15,000.

Q29. AM=41, GM=9 — value of X

• Tag: Maths → Progression
• Answer: B) 81 ✅ — x+y=82, xy=81 → 81 & 1 → 81.

Q30. CP of each article (net 14% profit)

• Tag: Maths → Profit and loss
• Answer: D) 1,050 ✅ — 2.4C − 126 = 2.28C → C = 1,050.

Q31. SP to gain 18% (TV)

• Tag: Maths → Profit and loss
• Answer: B) 13098 ✅ — 23% of CP = 2553 → CP = 11100 → SP@18% = 13098.

Q32. P(square number), cards 1–100

• Tag: Maths → Probability
• Answer: A) 1/10 ✅ — 10 perfect squares → 10/100 = 1/10.

Q33. Sphere in cube — value of ab

• Tag: Maths → Mensuration
• Answer: D) 1 ✅ — a = 6/π, b = π/6 → ab = 1.

Q34. Gain/loss % (17·CP = 8·(CP+SP))

• Tag: Maths → Profit and loss
• Answer: C) Gain 12.5% ✅ — 9CP = 8SP → SP/CP = 9/8 → 12.5% gain.

Q35. Rate of return on loan instalments

• Tag: Maths → Simple/Compound interest
• Answer: A) 16% p.a. ✅ — ₹10,000 repaid via 15 × ₹800 (=₹12,000) → effective ≈ 16% p.a.

Q36. Ratio of black:brown socks

• Tag: Maths → Linear equations
• Answer: B) 1:4 ✅ — 2x+4 = 1.5(8+x) → x=16 → 4:16 = 1:4.

Q37. Cone inside cube (vol 343) — cone volume

• Tag: Maths → Mensuration
• Answer: C) 90 cc ✅ — side 7, r=3.5, h=7 → V ≈ 90 cc.

Q38. SI when CI = 6656 @8%, 2 yrs

• Tag: Maths → Simple/Compound interest
• Answer: B) Rs. 6400 ✅ — P = 40000 → SI = 40000×0.08×2 = 6400.

Q39. 50% of box volume

• Tag: Maths → Mensuration
• Answer: A) 1500 ✅ — SA=1300 → k=5 → volume 3000 → 50% = 1500 m³.

Q40. P(3 or greater on a die)

• Tag: Maths → Probability
• Answer: D) 2/3 ✅ — {3,4,5,6} → 4/6 = 2/3.

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MENTAL ABILITY (Q41–Q60)

Q41. 5, 11, 23, 47, 95, ?

• Tag: Mental Ability → Number series
• Answer: B) 191 ✅ — ×2+1 → 95×2+1 = 191.

Q42. 3, 8, 15, 24, 35, ?

• Tag: Mental Ability → Number series
• Answer: A) 48 ✅ — Differences 5,7,9,11,13 → 48.

Q43. 1, 3, 6, 10, 15, ?

• Tag: Mental Ability → Number series
• Answer: C) 21 ✅ — Triangular numbers → +6 → 21.

Q44. Z, X, U, Q, L, ?

• Tag: Mental Ability → Letter series
• Answer: B) F ✅ — Positions −2,−3,−4,−5,−6 → 12−6 = 6 = F.

Q45. AZ, BY, CX, DW, ?

• Tag: Mental Ability → Letter series
• Answer: A) EV ✅ — First letter +1, second −1 → EV.

Q46. A, C, B, E, D, H, ?

• Tag: Mental Ability → Letter series
• Answer: B) G ✅ — Value pattern 1,3,2,5,4,8,7 → G.

Q47. COMPUTER → FRPSXWHU; SCIENCE → ?

• Tag: Mental Ability → Coding-decoding
• Answer: A) VFLHQFH ✅ — Shift +3 → SCIENCE = VFLHQFH.

Q48. DOG → WLT; CAT → ?

• Tag: Mental Ability → Coding-decoding
• Answer: A) XZG ✅ — Atbash (A↔Z) → CAT = XZG.

Q49. Walk 15E, 12N, 15W, 5S — direction

• Tag: Mental Ability → Direction sense
• Answer: A) North ✅ — Net 0 E-W, 7 N → North.

Q50. Facing S; 90°CW, 180°ACW, 270°CW

• Tag: Mental Ability → Direction sense
• Answer: A) North ✅ — S→W→E→N.

Q51. Coded relations P-Q×R+S

• Tag: Mental Ability → Blood relations
• Answer: B) P is paternal uncle of S ✅ — P is brother of Q, and Q is father of R (P = paternal-side uncle in the line to S).

Q52. "Wife of the only son of my mother-in-law"

• Tag: Mental Ability → Blood relations
• Answer: C) Sister-in-law ✅ — She is the wife of Raj's brother-in-law → sister-in-law.

Q53. Online-education increase — causes

• Tag: Mental Ability → Statements and conclusions
• Answer: C) Both I and II ✅ — Affordable internet and demand for flexible learning are both plausible causes.

Q54. "All teachers are educated" → conclusion

• Tag: Mental Ability → Statements and conclusions
• Answer: A) True ✅ — "Some educated people are teachers" is a valid converse.

Q55. Average speed (50 & 40 km/h)

• Tag: Mental Ability → Speed, Distance & Time
• Answer: A) 44.4 km/h ✅ — 2·50·40/90 = 44.4 km/h.

Q56. Original time (speed +25% → 1 hr less)

• Tag: Mental Ability → Speed, Distance & Time
• Answer: C) 5 hours ✅ — Time becomes ⅘; ⅕T = 1 → T = 5 h.

Q57. Two trains crossing (opposite directions)

• Tag: Mental Ability → Speed, Distance & Time
• Answer: B) 9 sec ✅ — 300 m ÷ 35 m/s ≈ 8.6 ≈ 9 sec.

Q58. "All fruits sweet, all apples fruits" → conclusion

• Tag: Mental Ability → Statements and conclusions
• Answer: A) True ✅ — Valid syllogism → all apples sweet.

Q59. A: squares are rectangles; R: rectangles have four right angles

• Tag: Mental Ability → Mathematical reasoning (A-R)
• Answer: B) Both true, but R is not the correct explanation of A ✅ — Squares are rectangles by definition (equal sides + right angles); R states only a rectangle property.

Q60. A: No cat is a dog; R: Some dogs are pets

• Tag: Mental Ability → Mathematical reasoning (A-R)
• Answer: B) Both true, but R is not the correct explanation of A ✅ — R is unrelated to why no cat is a dog.

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GENERAL AWARENESS (Q61–Q80)

Q61. SHANTI Act, 2025 (nuclear energy)

• Tag: GA → Atomic Research Programme / Current events
• Answer: A) I only ✅ — It allows private participation (I ✓); the 100 GW target is by 2047 not 2030 (II ✗) and it removes supplier liability (III ✗). (Verified online.)

Q62. Military exercises ↔ partner country

• Tag: GA → Organizations and Groups
• Answer: B) i-a, ii-d, iii-c, iv-b ✅ — Yudh Abhyaas–USA, Zapad–Russia, Mitra-Shakti–Sri Lanka, Bright Star–Egypt.

Q63. UN Security Council statements

• Tag: GA → United Nations (UNO)
• Answer: C) I and III only ✅ — 15 members (I ✓); non-permanent term is 2 years not 5 (II ✗); no immediate re-election (III ✓).

Q64. India's space achievements

• Tag: GA → Space Programme of India
• Answer: A) I only ✅ — Axiom-4 statement is correct (I ✓); SpaDeX made India the 4th (not first) to dock satellites in LEO (II ✗). (Verified online.)

Q65. PFBR (three-stage nuclear program)

• Tag: GA → Atomic Research Programme
• Answer: D) I, II and III ✅ — All three (U-238 breeding Pu; Th-232 blanket; transmutation to U-233) are correct.

Q66. ITER importance

• Tag: GA → Atomic Research Programme
• Answer: B) I and II only ✅ — Demonstrates fusion (I ✓) and lets India join fusion research (II ✓); it does not provide immediate commercial power (III ✗).

Q67. Nobel Peace Prize 2025

• Tag: GA → Honours and Prizes
• Answer: A) I only ✅ — Awarded to María Corina Machado of Venezuela (I ✓); it cannot be transferred to another person (II ✗). (Verified.)

Q68. Economic Survey 2025-26 (trade)

• Tag: GA → Exports and Imports / GDP
• Answer: D) Neither I nor II ✅ — India's merchandise share is well under 5% (I ✗) and India is a net exporter of services (II ✗).

Q69. A: rise in per-capita GNP always improves living standards

• Tag: GA → GDP/GNP (Assertion-Reason)
• Answer: D) A is false, R is true ✅ — Average GNP ignores distribution (A false); income is a fundamental development metric (R true).

Q70. Terrestrial vs marine temperature extremes

• Tag: GA → Weather, Climate
• Answer: C) Land has a lower specific heat capacity than oceans ✅ — Land heats/cools faster, giving greater extremes.

Q71. Mission for Aatmanirbharta in Pulses

• Tag: GA → Current events (National)
• Answer: A) Statement I and Statement II are correct ✅ — Both (self-sufficiency by 2030-31; reduce imports, boost production & incomes) are correct.

Q72. Ports ↔ special features

• Tag: GA → Means of Transport
• Answer: C) i-a, ii-c, iii-d, iv-b ✅ — Kamarajar–first corporatised; JNPT–first landlord-model; Paradip–top cargo-handling; Vizhinjam–first deep-water transhipment hub.

Q73. First Anglo-Sikh War battles (order)

• Tag: GA → Indian History
• Answer: A) I-II-III-IV ✅ — Mudki → Ferozeshah → Aliwal → Sobraon.

Q74. Rauf dance statements

• Tag: GA → Culture of J&K
• Answer: C) I and III ✅ — Folk dance on Kashmiri songs (I ✓), traditional pheran attire (III ✓); it is a group dance, not solo (II ✗).

Q75. Wetlands ↔ districts

• Tag: GA → Rivers and Lakes of J&K
• Answer: D) All of the above ✅ — Hokersar–Srinagar, Mansar–Samba, Wular–Bandipora, Hygam–Baramulla all correct.

Q76. Districts ↔ ODOP products (J&K)

• Tag: GA → Economy of J&K
• Answer: C) i-b, ii-a, iii-d, iv-c ✅ — Baramulla–Apples, Udhampur–Pickles, Samba–Mushroom, Ramban–Honey.

Q77. MUMKIN scheme (J&K)

• Tag: GA → Economy of J&K
• Answer: D) I, II and III ✅ — All three statements (youth livelihood; ~₹80,000/10% subsidy for small commercial vehicles; age 18–35) are correct.

Q78. IUCN "Endangered" species in J&K

• Tag: GA → Flora and Fauna of J&K
• Answer: C) II, III, IV and VI only ✅ — Per the key, Snow Leopard, Ibex, Himalayan Tahr and Cheer Pheasant are grouped here.

Q79. NOT a provision of the J&K Reorganisation Act, 2019

• Tag: GA → J&K Reorganisation Act 2019
• Answer: B) Judges appointed to the High Court are selected by the Union Government only ✅ — HC judges are appointed by the President via the collegium, not "the Union Government only".

Q80. Tributaries of the Jhelum

• Tag: GA → Rivers of J&K
• Answer: C) II, III and V only (Veshaw, Brengi, Rambiara) ✅ — Niki Tawi and Jajhar are not Jhelum tributaries.

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GENERAL SCIENCE (Q81–Q100)

Q81. Gravitational force when distance doubled

• Tag: Science → Gravitation
• Answer: D) One-fourth ✅ — F ∝ 1/d² → becomes ¼.

Q82. Organic acids ↔ sources

• Tag: Science → Acids
• Answer: D) i-a, ii-e, iii-d, iv-b, v-c ✅ — Oxalic–dark chocolate; Acetic–vinegar; Ascorbic–guava/amla; Methanoic–ant sting; Malic–apples.

Q83. Energy source (non-renewable, low-carbon, fission)

• Tag: Science → Sources of energy
• Answer: D) Nuclear Fuels ✅ — Fission-based, low-carbon, waste-disposal concerns.

Q84. Statement NOT related to Ocean Energy

• Tag: Science → Non-conventional energy
• Answer: A) OTEC … warm air above the sea … ✅ — OTEC uses warm surface water, not air — so A is wrong.

Q85. Liquid non-metal at room temperature

• Tag: Science → Physical properties of non-metals
• Answer: B) Bromine ✅

Q86. Correct statements about metals

• Tag: Science → Physical properties of metals
• Answer: A) Only I, II ✅ — Metals form basic oxides and are good reducing agents; they have low electronegativity/ionization energy (III, IV wrong).

Q87. Gas when water reacts with calcium

• Tag: Science → Chemical properties of metals
• Answer: A) Hydrogen ✅ — Ca + 2H₂O → Ca(OH)₂ + H₂.

Q88. Magnesium sulphate + copper

• Tag: Science → Reactivity series
• Answer: D) No reaction occurs ✅ — Cu is less reactive than Mg, so it cannot displace it.

Q89. Metals in decreasing order of reactivity

• Tag: Science → Reactivity series
• Answer: B) ✅ — Order: Li > Ca > Mg > Co > Ni > Ag > Pt > Au (option B).

Q90. Ore ↔ metal correctly matched

• Tag: Science → Occurrence of metals
• Answer: C) Halide ores – Silver (Horn silver, AgCl) ✅

Q91. Extraction by activity series

• Tag: Science → Extraction of metals
• Answer: D) All of the above ✅ — Electrolysis (Na/K), carbon reduction (Zn/Fe/Pb), heating ores (Cu/Hg) — all correct.

Q92. Nutrition in yeast and mushrooms

• Tag: Science → Life processes (Nutrition)
• Answer: A) Saprophytic ✅ — Both feed on dead organic matter.

Q93. Plant structures for gas exchange

• Tag: Science → Life processes
• Answer: B) Stomata ✅ — Stomata are the main gas-exchange gateways.

Q94. Term NOT related to the kidney

• Tag: Science → Excretion
• Answer: C) Glottis ✅ — Glottis is part of the respiratory tract.

Q95. Biodegradable vs non-biodegradable

• Tag: Science → Environmental pollution
• Answer: A) ✅ — Bio: animal bones, leather; Non-bio: DDT, mercury, lead, silver foils.

Q96. Correct aquatic food chain

• Tag: Science → Ecosystem (Food chains)
• Answer: C) Algae → Sea urchins → Crab → Squid → Spotted dolphin → Tiger shark ✅

Q97. Ozone-depleting substance ↔ source

• Tag: Science → Ozone layer / depletion
• Answer: D) CFCs – Refrigerants and aerosol propellants ✅

Q98. Recessive trait in Mendel's experiments

• Tag: Science → Mendel's experiments
• Answer: B) The trait that hides in F₁ but reappears in F₂ ✅

Q99. Asexual reproduction ↔ examples

• Tag: Science → Types of reproduction
• Answer: A) i-b, ii-a, iii-c, iv-d ✅ — Vegetative–Begonia/Bryophyllum; Fragmentation–mosses/liverworts; Budding–Yeast/Hydra; Spore formation–Clostridium/Bacillus.

Q100. Correct statements about Vertebrates

• Tag: Science → Classification of animals
• Answer: D) All of the above ✅ — Backbone subphylum; bilateral symmetry; includes fish→mammals.

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COMPUTER APPLICATIONS (Q101–Q120)

Q101. Boots & compiles, but program won't execute, no error

• Tag: Computer → Fundamentals
• Answer: B) Insufficient RAM ✅ — Lack of memory can prevent execution without a compile error.

Q102. Tactile / refreshable braille display

• Tag: Computer → Output devices
• Answer: A) Electro-mechanical device using round-tipped pins to raise Braille characters ✅

Q103. Hardware ↔ system software interaction

• Tag: Computer → Hardware & Software
• Answer: C) The OS acts as an intermediary, managing resources and providing hardware abstraction ✅

Q104. Input/output devices — most accurate

• Tag: Computer → Input and output devices
• Answer: B) OCR scanners are purely input devices ✅

Q105. Powers on, no display/sound, OS-drive swap fails

• Tag: Computer → Hardware
• Answer: C) A hardware failure in a core internal component ✅ — Points to RAM/motherboard/GPU, not the OS.

Q106. VBA "On Click" script (MS Access)

• Tag: Computer → MS Access
• Answer: B) It automatically updates every record in the students table ✅ — Per the shown UPDATE-style code.

Q107. Roman then Arabic page numbering (MS Word)

• Tag: Computer → MS Word
• Answer: B) Add a section break and format page numbers separately ✅

Q108. Send Gmail on LAN with no Internet

• Tag: Computer → E-mail & Internet
• Answer: D) No — Gmail needs Internet access to contact its remote servers ✅

Q109. Large attachment auto-shared as a link

• Tag: Computer → E-mail & Internet
• Answer: A) Cloud storage integration ✅

Q110. Match cache/register/interpreter/compiler

• Tag: Computer → Fundamentals
• Answer: D) i-b, ii-d, iii-c, iv-a ✅ — Interpreter executes line-by-line; Compiler translates the whole program (the decisive pairings).

Q111. Device to draw naturally/precisely

• Tag: Computer → Input devices
• Answer: A) Graphics tablet ✅

Q112. Component so OS/apps can use new GPU

• Tag: Computer → Hardware & Software
• Answer: D) Device driver ✅

Q113. NOT true about virtual memory

• Tag: Computer → Operating system
• Answer: C) It permanently stores running processes in secondary storage ✅ — Virtual memory swaps temporarily, not permanently.

Q114. Maps filenames to physical storage

• Tag: Computer → Operating system
• Answer: A) File system directory structure ✅

Q115. OS for network testing / scripting / open-source

• Tag: Computer → Operating system
• Answer: B) Linux ✅

Q116. How a browser loads a webpage from a URL

• Tag: Computer → E-mail & Internet
• Answer: C) DNS finds the IP and HTTP/HTTPS loads the page ✅

Q117. Logo on all slides, same position

• Tag: Computer → PowerPoint
• Answer: D) Slide Master ✅

Q118. Excel =IF((SUM(A1:A5)>100,(AVERAGE(A1:A5),"Low")))

• Tag: Computer → MS Excel
• Answer: C) No — it will not work because of a syntax issue ✅ — Mismatched/extra parentheses break the formula.

Q119. Uniform layout/fonts/design across pages/slides

• Tag: Computer → MS Word / PowerPoint
• Answer: B) Master template system ✅

Q120. Store/organise structured data in rows & columns

• Tag: Computer → MS Access / Databases
• Answer: B) Database management ✅

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Answer Key at a Glance (Series A)

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Sources (verified current-affairs items)

• Axiom Mission 4 — India/Poland/Hungary's first govt-sponsored flight in 40+ years (Axiom Space)
• SHANTI Act 2025 — private participation, liability reform (Vision IAS)
• President assents to SHANTI Bill (NewsOnAir)