TGPSC Group-I Prelims 2002

286 questions from the 2002 papers, each with the official answer and an explanation.

A question repeated across years is listed once, under one of the years it appeared.

201. Q201SCHOOL PHYSICS

     A pressure cooker significantly reduces cooking time. How?

     • aDue to heat being distributed very evenly
     • bVery high temperature makes the food soft.
     • cDue to the boiling point inside the cooker increasingAnswer
     • dDue to increasing the stove flame
     ›Explanation

     Option C is correct because the trapped steam increases the internal pressure, which raises the boiling point of water above 100°C and allows food to cook at a higher temperature. Option A: Even heat distribution depends on the base material and design of the vessel, not the pressure cooking mechanism itself. Option B: High temperature softens food faster, but it is the elevated boiling point that enables the water inside to reach that high temperature. Option D: The stove flame setting is controlled externally by the user and is not a function of the cooker.

202. Q202SCHOOL PHYSICS

     The average kinetic energy of a gas molecule at absolute temperature T is?

     • akT/2
     • b3kT/4
     • ckT
     • d3kT/2Answer
     ›Explanation

     Option D is correct because a gas molecule has three translational degrees of freedom, and according to the equipartition theorem, each degree of freedom contributes (1/2)kT, totaling (3/2)kT. Translational degrees of freedom in three dimensions = 3 Average kinetic energy per degree of freedom = (1/2)kT Total average kinetic energy = 3 × (1/2)kT = 3kT/2 Option A: kT/2 corresponds to the energy associated with only a single degree of freedom. Option B: 3kT/4 is an incorrect fraction not supported by the law of equipartition of energy. Option C: kT accounts for only two degrees of freedom rather than three.

203. Q203SCHOOL PHYSICS

     The following property helps Optical Fibers for use in communication?

     • aRefraction
     • bDiffraction
     • cInterference
     • dTotal internal reflectionAnswer
     ›Explanation

     Option D is correct because optical fibers transmit light signals over long distances with minimal attenuation by trapping the beam inside the core via total internal reflection. Option A: Refraction alone bends light across boundaries and would cause the signal to escape into the cladding. Option B: Diffraction causes light waves to spread around openings, leading to pulse degradation rather than confinement. Option C: Interference describes the superposition of waves to form fringe patterns, not the mechanism used to guide light.

204. Q204SCHOOL PHYSICS

     What is the reason for the blue color of the sky?

     • aReflection of light in the blue field
     • bTransmission in the blue field
     • cScattering of light in the blue field (Scattering of light)Answer
     • dAbsorption of other colors of light
     ›Explanation

     Option C is correct because the blue color of the sky is caused by Rayleigh scattering, where shorter wavelengths of sunlight, predominantly blue, are scattered in all directions by gas molecules and fine particles in the atmosphere much more efficiently than longer wavelengths. Option A: Sunlight is scattered rather than reflected uniformly by a surface. Option B: Atmospheric transmission alone does not direct blue light toward an observer on the ground. Option D: Atmospheric molecules scatter blue light rather than selectively absorbing all other visible wavelengths.

205. Q205SCHOOL PHYSICS

     While a child was splashing water on himself on a Sunday morning, one of the children around him said, 'I saw a rainbow in that water.' It is known that this child was in the direction given below?

     • aWest directionAnswer
     • bNorth direction
     • cSouth direction
     • dEast direction
     ›Explanation

     Option A is correct because an observer can only see a rainbow when the Sun is behind them, so on a morning when the Sun is in the east, the observer must face toward the west. Option B: Looking north places the observer perpendicular to the sunlight coming from the east, which prevents rainbow observation. Option C: Looking south places the observer at a right angle to the morning sun instead of directly opposite to it. Option D: Looking east means facing directly into the morning sun, where a rainbow cannot form.

206. Q206SCHOOL PHYSICS

     If a plane mirror approaches a stationary observer with a speed of ms⁻¹, the image seen in the mirror will approach the observer with the following speed?

     • a2 ms⁻¹
     • b4 ms⁻¹Answer
     • c8 ms⁻¹
     • d0

     Explanation coming soon.

207. Q207SCHOOL PHYSICS

     'Sonic boom' is related to what?

     • a1) Laser beams
     • b2) Radar
     • c3) Supersonic aircraftAnswer
     • d4) Reflection
     ›Explanation

     Option C is correct because a sonic boom is an intense, thunder-like sound produced at the ground by shock waves generated whenever an aircraft or other object travels through the air at supersonic speeds, faster than the speed of sound. Option A: Laser beams are coherent light waves that do not create aerodynamic pressure shock waves in air. Option B: Radar utilizes electromagnetic radio waves rather than producing acoustic shock waves. Option D: Simple sound reflection generates echoes or reverberation, not aerodynamic shock fronts caused by exceeding Mach 1.

208. Q208SCHOOL PHYSICS

     A pipe closed at one end only functions as given below?

     • awith all harmonics
     • bwith even number harmonics
     • cwith odd number harmonicsAnswer
     • dNone of the above harmonics
     ›Explanation

     Option C is correct because a pipe closed at one end produces standing waves with a displacement node at the closed end and an antinode at the open end, resulting in frequencies that are only odd integer multiples of the fundamental frequency. Resonant frequency formula: f = (2n - 1)v / (4L) for n = 1, 2, 3 Ratio of harmonics: 1 : 3 : 5 : 7 Option A: Even harmonics are physically impossible due to the asymmetric boundary conditions of the pipe. Option B: Only odd multiples of the fundamental frequency satisfy the required boundary conditions. Option D: The pipe does produce harmonics, specifically all the odd-numbered ones.

209. Q209SCHOOL PHYSICS

     A circular conductor loop with radius r has a steady current i. Its plane is placed perpendicular to a magnetic field (B). The active magnetic force on this conductor loop is?

     • aπ i r B
     • b2π i r B
     • ci r B
     • dZeroAnswer
     ›Explanation

     Option D is correct because the net magnetic force on any closed planar loop carrying a steady current in a uniform magnetic field is zero. Net force on a current-carrying loop is given by F = i * (closed line integral of dl) x B For any closed loop, the vector sum of line elements (closed line integral of dl) equals zero Therefore, F = 0 Option A: This value mistakenly evaluates a product of area or dimensions with magnetic flux density rather than the closed vector sum of forces. Option B: This represents the perimeter multiplied by current and magnetic field, which would only represent total tension or scalar sum of elemental forces rather than net resultant vector force. Option C: This expression does not account for the circular geometry and vector cancellation of opposing current elements.

210. Q210SCHOOL PHYSICS

     The age of animal and plant fossils is measured by what?

     • a1) Ammonia dating
     • b2) Carbon datingAnswer
     • c3) Sulfur dating
     • d4) Uranium dating
     ›Explanation

     Option B is correct because carbon dating, specifically radiocarbon dating measuring the decay of Carbon-14, is the standard technique used to determine the age of once-living plant and animal fossils up to around 50,000 years old. Option A: Ammonia dating is wrong because ammonia is not a radioactive chronometer used in geochronology or paleontology. Option C: Sulfur dating is wrong because sulfur isotopes are not used for dating biological fossil remains. Option D: Uranium dating is wrong because uranium-lead dating is primarily applied to determine the age of ancient geological rocks and minerals, not recent animal and plant remains.

211. Q211SCHOOL PHYSICS

     The reason for the sun's energy is?

     • aArtificial radioactivity
     • bNuclear fusionAnswer
     • cNuclear fission
     • dNatural radioactivity
     ›Explanation

     Option B is correct because the primary reason for the Sun's energy is nuclear fusion, during which hydrogen atoms combine to form helium, converting mass into radiant energy according to Einstein's mass-energy relation. Option A: Artificial radioactivity is wrong because it involves human-made radioactive isotopes produced in laboratories or reactors. Option C: Nuclear fission is wrong because it is the process of breaking apart heavy nuclei, not fusing light ones. Option D: Natural radioactivity is wrong because the spontaneous decay of naturally occurring heavy unstable isotopes produces negligible energy compared to solar fusion.

212. Q212SCHOOL PHYSICS

     When two vehicles travel in opposite directions with the speed 'C' of light, what is the relative speed observed by the passengers of the two vehicles?

     • a2 C
     • bCAnswer
     • cZero
     • dNone of the above answers is correct
     ›Explanation

     Option B is correct because according to Einstein's special theory of relativity, the speed of light in a vacuum is an invariant constant in all inertial reference frames, and applying the relativistic velocity addition formula to two speeds of C yields C. Relativistic velocity addition formula: u' = (u + v) / (1 + uv/c²) Numerator: C + C = 2C Denominator: 1 + (C × C)/C² = 1 + 1 = 2 Result: 2C / 2 = C Option A: 2 C relies on classical Galilean addition of velocities, which is invalid at relativistic speeds. Option C: Zero would imply no relative motion between the vehicles, which contradicts their opposite motion. Option D: None of the above answers is correct is wrong because C is the mathematically and physically correct answer.

213. Q213SCHOOL PHYSICS

     The work function of an aluminum surface is 4.2 eV, and that of a sodium surface is 2.0 eV. When radiation falls on the surfaces of these two metals, the emission of photo-emissive rays is observed in the following way?

     • aAl and Na have the same threshold frequency
     • bAl threshold frequency > Na threshold frequencyAnswer
     • cNa threshold frequency > Al threshold frequency
     • dAl threshold wavelength > Na threshold wavelength
     ›Explanation

     Option B is correct because the threshold frequency is directly proportional to the work function of a metal, meaning a higher work function requires a higher threshold frequency for photoemission. Work function formula: W = h * nu_0 Threshold frequency: nu_0 = W / h Work function of Al = 4.2 eV Work function of Na = 2.0 eV Since 4.2 eV > 2.0 eV, nu_0(Al) > nu_0(Na) Option A: Aluminum and sodium have different work functions, so their threshold frequencies cannot be equal. Option C: Sodium has a lower work function than aluminum, which gives it a lower threshold frequency, not a higher one. Option D: Threshold wavelength is inversely proportional to work function, which makes aluminum threshold wavelength shorter than that of sodium.

214. Q214SCHOOL PHYSICS

     If a small amount of Indium is added to Germanium, it changes into the following?

     • an - type semiconductor
     • bp - type semiconductorAnswer
     • cResistor
     • dInsulator
     ›Explanation

     Option B is correct because Indium is a trivalent impurity (Group 13), and doping it into tetravalent Germanium (Group 14) creates an abundance of holes (deficiency of electrons), resulting in a p-type semiconductor. Option A: n - type semiconductor is wrong because n-type semiconductors require doping with pentavalent impurities like phosphorus, arsenic, or antimony. Option C: Resistor is wrong because doping Germanium increases its conductivity rather than converting it into an ordinary linear resistor. Option D: Insulator is wrong because adding dopant atoms introduces mobile charge carriers and reduces resistivity, moving it further away from being an insulator.

215. Q215SCHOOL PHYSICS

     Microwave oven uses which of the following property?

     • aMicrowave absorption by waterAnswer
     • bMicrowave absorption by the cooking vessel
     • cMicrowave reflection by the food
     • dNone of the above answers is correct
     ›Explanation

     Option A is correct because microwaves operate at frequencies absorbed by dipolar water molecules in food, causing rapid molecular rotation and thermal energy generation. Option B: is incorrect because cookware meant for microwave ovens is made of materials that do not absorb microwaves. Option C: is incorrect because food absorbs rather than reflects microwave energy, with reflection occurring mainly on the metal interior walls. Option D: is incorrect because microwave heating relies directly on dielectric absorption by water.

216. Q216SCHOOL PHYSICS

     LED is a semiconductor. It converts _______ energy into _______ energy?

     • aChemical; Electrical
     • bElectrical; LightAnswer
     • cLight; Electrical
     • dHeat; Light
     ›Explanation

     Option B is correct because a Light Emitting Diode (LED) is a forward-biased p-n junction semiconductor device that emits photons when an electric current passes through it, directly converting electrical energy into light energy. Option A: Describes electrochemical cells or batteries, not an LED. Option C: Describes photovoltaic or solar cells, which generate electricity from incident light. Option D: Describes incandescent filaments, which produce light as a byproduct of thermal radiation.

217. Q217SCHOOL PHYSICS

     Fathometer is an instrument that measures

     • aSound travel time
     • bSound intensity
     • cOcean depthAnswer
     • dSound wave flow
     ›Explanation

     Option C is correct because a fathometer is a specialized marine depth-finding echo sounder used on ships to measure the depth of the ocean by calculating the travel time of reflected acoustic pulses. Option A: Sound travel time is merely the measured intermediate parameter used by the instrument to calculate ocean depth, not the quantity it is deployed to measure. Option B: Sound intensity is measured using sound level meters calibrated in decibels. Option D: Sound wave flow is not a recognised measurable oceanographic or physical parameter.

218. Q218SCHOOL PHYSICS

     Which instrument is used to measure wind speed in the atmosphere?

     • aWind gauge
     • bSeismometer
     • cThermometer
     • dAnemometerAnswer
     ›Explanation

     Option D is correct because an anemometer is the meteorological instrument specifically designed to determine the speed and pressure of wind in the atmosphere. Option A: is an imprecise non-standard term, whereas an anemometer is the standard scientific instrument. Option B: detects and records vibrations and ground motion caused by seismic activity. Option C: measures temperature rather than fluid velocity.

219. Q219Logical reasoning and analytical ability

     Instructions for questions 66 and 67: Consider the following information and find the answers to questions 66 and 67. In a school, there are one hundred students and an equal number of lockers. The first student to enter the school opens every locker door. The second student enters the school and closes every second locker door. The third student to enter the school opens every third locker door if it is closed, and closes it if it is open. The fourth student to enter the school opens every fourth locker door if it is closed, and closes it if it is open. In the same sequence, all one hundred students continue this process. By the very end, which of the following locker doors will be open?

     • a80th locker
     • b81st lockerAnswer
     • c83rd locker
     • d84th locker
     ›Explanation

     Option B is correct because a locker door is toggled once for every positive divisor of its locker number, meaning only perfect squares end up open due to having an odd number of divisors. Divisors of 80: 1, 2, 4, 5, 8, 10, 16, 20, 40, 80 (10 divisors, ends closed) Divisors of 81: 1, 3, 9, 27, 81 (5 divisors, odd number, ends open) Divisors of 83: 1, 83 (2 divisors, ends closed) Divisors of 84: 1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42, 84 (12 divisors, ends closed) Option A: 80 is not a perfect square, so it has an even number of factors and remains closed. Option C: 83 is a prime number with exactly two factors, leaving it closed. Option D: 84 is not a perfect square, so it has an even number of factors and remains closed.

220. Q220Logical reasoning and analytical ability

     Directions for questions 66 and 67: Read the following carefully and answer questions 66 and 67. In a school there are one hundred students and the same number of lockers. The first student to enter the school opens all the locker doors. The second student to enter closes every second locker door. The third student to enter goes to every third locker door and opens it if it is closed, or closes it if it is open. The fourth student to enter does the same with every fourth locker door: opens it if closed, closes it if open. In the same way, all one hundred students, one after another, continue in this manner. Which of the following locker doors will be closed?

     • aFirst locker door
     • b81st locker door
     • c21st locker doorAnswer
     • dNone of the above
     ›Explanation

     Option C is correct because in the classical locker problem where all lockers start closed, a locker ends up closed if it has an even number of factors, which holds true for non-perfect square numbers like 21. Factors of 1: 1 (odd count, 1 factor, ends open) Factors of 81: 1, 3, 9, 27, 81 (odd count, 5 factors, ends open) Factors of 21: 1, 3, 7, 21 (even count, 4 factors, ends closed) Option A: It is a perfect square with an odd number of factors, so it ends up open. Option B: It is a perfect square with an odd number of factors, so it ends up open. Option D: It falsely claims none are closed when the 21st locker door is closed.

221. Q221Logical reasoning and analytical ability

     In the following long string of letters, how many 'A's are there that are preceded by 'Z' and followed by 'B'? ZA B A Z A B AZB ZBA ZBZ AB

     • athreeAnswer
     • bzero
     • cone
     • dtwo
     ›Explanation

     Option A is correct because the combination Z followed by A followed by B appears 3 times in the string when ignoring spaces: ZAB, Z A B, and AZB. Z A B gives the first pattern Z A B gives the second pattern AZB gives the third pattern Option B: Incorrect because three occurrences exist in the given sequence. Option C: Incorrect because it overlooks two of the matching occurrences. Option D: Incorrect because there are three valid instances, not two.

222. Q222Logical reasoning and analytical ability

     From the word 'ASTOUNDER', without disturbing the order of letters, and using each letter only once, how many independent words can be created?

     • aNot even one can be created
     • bTwo
     • cThreeAnswer
     • dFour
     ›Explanation

     Option C is correct because the letters in 'ASTOUNDER' can be partitioned consecutively without changing their order into three separate valid English words: AS, TO, and UNDER. Option A: It is incorrect because valid independent words can indeed be formed from the letters. Option B: It is incorrect because at least three non-overlapping, sequential words (AS, TO, UNDER) can be identified. Option D: It is incorrect because dividing the word further into four independent consecutive words using every letter once is not possible.

223. Q223Logical reasoning and analytical ability

     In a family, there is one grandmother, one mother, one father, four sons and their wives; each son has one son and two daughters. What is the number of females in the family?

     • a14Answer
     • b16
     • c12
     • d24
     ›Explanation

     Option A is correct because counting all female members across the three generations of the family results in a total of 14. Grandmother = 1 Mother = 1 Wives of four sons = 4 Daughters of four sons = 4 * 2 = 8 Total females = 1 + 1 + 4 + 8 = 14 Option B: It overcounts the total number of females by two. Option C: It undercounts the total number of females by two, missing either two wives or two daughters. Option D: It miscalculates the count, possibly by including male members or duplicating generations.

224. Q224Logical reasoning and analytical ability

     Consider the following statement and find the answers for questions 80 to 82. Ram runs faster than Rahim but cannot run faster than Peter, who runs slower than Jain. 80. Who runs the fastest?

     • aJainAnswer
     • bPeter
     • cRam
     • dRahim
     ›Explanation

     Option A is correct because arranging the runners in order of speed shows that Jain is faster than Peter, who is faster than Ram, who in turn is faster than Rahim. Speed relation 1: Ram > Rahim Speed relation 2: Peter > Ram Speed relation 3: Jain > Peter Combined order: Jain > Peter > Ram > Rahim Option B: Peter is slower than Jain. Option C: Ram is slower than both Jain and Peter. Option D: Rahim is the slowest runner among all four.

225. Q225Logical reasoning and analytical ability

     Read the following statement and answer questions 80 to 82. Ram runs faster than Rahim, but he cannot run faster than Peter, who runs slower than Jain. Who is the slowest runner?

     • aJain
     • bPeter
     • cRam
     • dRahimAnswer

     Explanation coming soon.

226. Q226Logical reasoning and analytical ability

     Read the following statement and answer questions 80 to 82. Ram runs faster than Rahim, but he cannot run faster than Peter, who runs slower than Jain. Who will stand in second place in the running race?

     • aJain
     • bPeterAnswer
     • cRam
     • dRahim

     Explanation coming soon.

227. Q227Logical reasoning and analytical ability

     Six people A, B, C, D, E, F are standing in a circle. B is between F and C. A is between E and D. F is to the left of D. Who is between A and F?

     • aB
     • bC
     • cDAnswer
     • dE
     ›Explanation

     Option C is correct because arranging the six people clockwise in the circle places D directly between A and F. Clockwise arrangement: D, F, B, C, E, A B is placed between F and C A is placed between E and D F sits immediately to the left of D D is situated between A and F Option A: B sits between F and C, not between A and F. Option B: C sits between B and E. Option D: E sits between C and A.

228. Q228Logical reasoning and analytical ability

     Directions for questions 110 to 113: A family has six children, A, B, C, D, E and F. A is younger than C. E is older than F, who is older than C. F is younger than B. D is the fourth child in order of birth. Keeping these facts in mind, answer questions 110 to 113. Who is the oldest of all?

     • aE
     • bBAnswer
     • cF
     • dA

     Explanation coming soon.

229. Q229Logical reasoning and analytical ability

     Directions for questions 110 to 113: A family has six children, A, B, C, D, E and F. A is younger than C. E is older than F, who is older than C. F is younger than B. D is the fourth child in order of birth. Keeping these facts in mind, answer questions 110 to 113. Who is the youngest of all?

     • aAAnswer
     • bB
     • cF
     • dA

     Explanation coming soon.

230. Q230Logical reasoning and analytical ability

     Directions for questions 110 to 113: A family has six children, A, B, C, D, E and F. A is younger than C. E is older than F, who is older than C. F is younger than B. D is the fourth child in order of birth. Keeping these facts in mind, answer questions 110 to 113. Who is older than only three people?

     • aD
     • bE
     • cFAnswer
     • dC

     Official answer shown. The explanation is under review.

231. Q231Logical reasoning and analytical ability

     Directions for questions 110 to 113: A family has six children, A, B, C, D, E and F. A is younger than C. E is older than F, who is older than C. F is younger than B. D is the fourth child in order of birth. Keeping these facts in mind, answer questions 110 to 113. Who is the second child?

     • aA
     • bC
     • cF
     • dEAnswer

     Explanation coming soon.

232. Q232Series, analogy and odd man out

     If the value of D is 24 and the value of D is 26, then what will be the value of D?

     • a37
     • b25
     • c29
     • d32Answer

     Explanation coming soon.

233. Q233Series, analogy and odd man out

     In what order do the following words appear in dictionaries? A. Repoint B. Reptile C. Repent D. Repute E. Report

     • aE, D, A, C, B
     • bC, A, E, B, DAnswer
     • cC, E, A, B, D
     • dE, A, D, C, B
     ›Explanation

     Option B is correct because arranging the words according to standard dictionary order places them by comparing letters from left to right starting at the fourth letter. Repent: R-e-p-e Repoint: R-e-p-o-i Report: R-e-p-o-r Reptile: R-e-p-t Repute: R-e-p-u Correct sequence: C, A, E, B, D Option A: E, D, A, C, B begins with Report instead of Repent. Option C: C, E, A, B, D incorrectly places Report before Repoint even though o-i comes before o-r. Option D: E, A, D, C, B starts with Report and misplaces Repent later in the sequence.

234. Q234Series, analogy and odd man out

     Which letter should be placed in the position of the question mark among the following? C M D O / G R J ?

     • aVAnswer
     • bS
     • cT
     • dM
     ›Explanation

     Option A is correct because corresponding letters between the two four-letter groups advance by consecutively increasing values. C (3) to G (7) is +4 M (13) to R (18) is +5 D (4) to J (10) is +6 O (15) + 7 = 22, which corresponds to V Option B: S is at position 19, which corresponds to an addition of only 4 to O. Option C: T is at position 20, which corresponds to an addition of 5. Option D: M is at position 13, which moves backward instead of forward.

235. Q235Series, analogy and odd man out

     Find the odd one out among the following.

     • aFJQPAnswer
     • bCGON
     • cHLTS
     • dLPXW
     ›Explanation

     Option A is correct because FJQP does not maintain a constant difference between the alphabetical positions of consecutive letters, unlike the other three clusters. C(3) + 4 = G(7), G(7) + 8 = O(15), O(15) - 1 = N(14) H(8) + 4 = L(12), L(12) + 8 = T(20), T(20) - 1 = S(19) L(12) + 4 = P(16), P(16) + 8 = X(24), X(24) - 1 = W(23) F(6) + 4 = J(10), but J(10) + 7 = Q(17), which breaks the +4, +8, -1 pattern. Option B: CGON follows the pattern +4, +8, -1 consistently. Option C: HLTS follows the pattern +4, +8, -1 consistently. Option D: LPXW follows the pattern +4, +8, -1 consistently.

236. Q236Series, analogy and odd man out

     Find the odd one out?

     • aMegasthenesAnswer
     • bFa Hien
     • cI-Tsing
     • dHiuen Tsang
     ›Explanation

     Option A is correct because Megasthenes was an ancient Greek historian and ambassador sent to the Mauryan court, whereas all the other figures were Chinese Buddhist travellers. Option B: Fa Hien was a Chinese Buddhist monk who visited India during the Gupta period to collect Buddhist texts. Option C: I-Tsing was a Chinese Buddhist monk who travelled to India via maritime route during the 7th century CE. Option D: Hiuen Tsang was a Chinese Buddhist scholar and pilgrim who visited India during the reign of King Harshavardhana.

237. Q237Coding, decoding and relations

     In a certain language, 'sa re ga ma' means "is land of the dead". 'ga pa re dha' means "the end of time", and 'na se ma pa' means "it is dead end". Then, which of the following would mean "time of the Jackal" in the same coded language?

     • aga sur re pa
     • bga sur pa ma
     • cre ga sur dhaAnswer
     • dga re dha ma
     ›Explanation

     Option C is correct because deducing the codes from the given statements reveals that the phrase requires the codes for time, of, the, and a novel code for Jackal. Comparing the first two sentences shows that the and of correspond to ga and re Comparing the second and third sentences shows that end corresponds to pa From the second sentence, time must correspond to dha Jackal is a new word and must take an unused code, which is sur Option A: It includes pa, which means end, rather than dha, which means time. Option B: It includes ma, which means is or dead, and lacks dha. Option D: It contains only previously defined words and includes ma instead of a code for Jackal.

238. Q238Coding, decoding and relations

     If 'pov' is the code for "monkey", and 'ga pur do ma' is the code for "the jackal is dead", then what is the code for "the monkey is dead"?

     • aga sur ma pog
     • bga do pov ma
     • csur do go pov
     • dCannot be determinedAnswer
     ›Explanation

     Option D is correct because the specific one-to-one correspondence between the four words in the second statement and their respective codes cannot be determined without additional information. Option A: It introduces the code sur which is not present in the given premise. Option B: It assumes jackal specifically maps to pur, which cannot be uniquely established. Option C: It introduces unknown codes like sur and go that are absent from the premises.

239. Q239Coding, decoding and relations

     If MISTAKE is written as 4356127 in a certain code language, how would STEAM be written in the same language?

     • a13457
     • b75614
     • c65741
     • d56714Answer
     ›Explanation

     Option D is correct because each letter in STEAM takes its directly assigned numeric digit from the word MISTAKE. S is coded as 5 T is coded as 6 E is coded as 7 A is coded as 1 M is coded as 4 Option A: It incorrectly assigns 1 to S and 3 to T. Option B: It reverses the codes for S and E and mismatches the other letters. Option C: It swaps the positions of the codes for S and T.

240. Q240Coding, decoding and relations

     If a pen is considered a stick, a stick a nib, a nib a needle, a needle a rope, and a rope a thread, then what would we dip in ink to write?

     • aStick
     • bNib
     • cNeedleAnswer
     • dThread
     ›Explanation

     Option C is correct because the item dipped in ink to write is a nib, and the given coding rules state that a nib is considered a needle. Object dipped in ink to write is a nib A nib is considered a needle Option A: refers to stick, which represents a pen rather than a nib. Option B: provides the literal real-world answer without applying the substitution code. Option D: refers to thread, which is the substitution code for a rope.