Prezident maktabi imtihon savollari to’plami Prezident maktabi imtihon savollari to’plamiPresidential Schools Admissions Test — Sample itemswith explained answersTest A: Problem SolvingKey: DJustificationFor every one 500 som banknote, there will be two 200 som banknotes and six 100 sombanknotes. So, for every one 500 som banknote there will be a total of 9 banknotes addingup to 1500 som ( (1 x 500) + (2 x 200) + (6 x 100)).12000/1500 = 8, so there will 8 lots of 9 banknotes, and 8 x 9 = 72.1 Anora was counting her money and found that she had 12000 som. She was able to put all ofher banknotes into three piles of 100 som notes, 200 som notes and 500 som notes. She foundthat there were three times as many 100 som notes as 200 som notes, and twice as many 200som notes as 500 som notes.How many banknotes did Anora have?A 42B 48C 60D 72E 84Key: DJustificationKash needs size 4, so shoe A, C or D. But shoe C is only available in black, so shoe A or D.Mekah needs size 8, so shoe A, B, C, E. But it must be white or red, so only shoe A.Mrs Pasha must buy shoe A + shoe A costing $120, or shoe D + shoe A costing $130. Theleast cost is therefore $120.2 Mrs Pasha is buying sports shoes for her two sons, Kash and Mekah.The following table shows the shoes that are available.type sizes available colours available costshoe A 1 – 10 white $60shoe B 5 – 12 black, blue $50shoe C 3 – 8 black $55shoe D 2 – 6 red, black, white $70shoe E 5 – 10 blue, black $40Kash needs size 4, but he will not have black or blue shoes.Mekah needs size 8, and will only have white or red shoes.What is the least amount that Mrs Pasha will have to pay for the two pairs of shoes if her sons’wishes are met?A $100B $110C $115D $120E $1303 A piece of rectangular paper is folded in half, and then in half again. The second fold is at rightanglesto the first.A corner is cut off the folded paper. The paper is then completely unfolded.Which of the following is not a possible appearance of the unfolded paper?(The dotted lines represent the folds).ABCDEKey: BJustificationB is the only appearance which is not possible. Each of the others can be made by cuttingone of the corners.Test A: Critical Thinking4 Lots of people in the world do not have clean water to drink.+Drinking dirty water can easily make people ill.+Governments have a duty to help people stay healthy.=________________________________________________Which one of these sentences should go in the space above?A People should not drink dirty water.B Everyone should try to stay healthy.C Lots of people have to travel a long way to find drinking water.D Governments never do their duty.E Governments should make sure people have clean drinking water.Key: EJustificationFrom the first two sentences we can conclude that a lack of clean drinking water is likely tobe affecting people’s health. With the addition of the third sentence we can conclude that,since people’s health is partly the responsibility of governments, they have a duty to try toremedy this.DistractorsA cannot be concluded, as we are told that some people in the world have no access toclean water.B is not supported by any of the sentences, either independently or in combination.C is not supported by any of the sentences, either independently or in combination.D cannot be concluded, as whilst it is strongly implied that governments are failing in theirduties in respect of drinking water, it does not follow that they do not ever do their duty inother respects.5 When Kobe heard that Mansur had got full marks in a recent maths test, he said: “You see? Iknew Mansur had cheated.”Which one of these sentences has to be true for what Kobe says to be correct?A It was not possible for anyone to get full marks on the test because it was so difficult.B Mansur would not have been able to get full marks in the maths test without cheating.C The test was the hardest one that any of the class could remember taking.D Mansur is not clever enough to get full marks in any tests.E Mansur has cheated on other tests before this one.Key: BJustificationIf Kobe is able to deduce only from the fact that Mansur got full marks that Mansur musthave cheated, it must not have been possible for Mansur to score full marks withoutcheating. If this is not the case, what Kobe says is not justified.DistractorsA would be sufficient grounds for Kobe’s claim, but goes beyond what has to be true, as weare only told Kobe’s result.C does not have to be true – it may be that the test was quite easy for the other students.D does not have to be true – it may be that Mansur excels in other subjects, or would scorefull marks on a much easier maths test.E does not have to be true – it may be that this is the first time Mansur has cheated on atest.6 In a talk to our school a famous explorer said: “For their own good, young people should beencouraged to be much more adventurous.”Which one of these facts would make you most likely to agree with the explorer?A Some young people are naturally more courageous than others.B People who never take risks do not learn how to deal with dangerous situations.C Accidents cannot be avoided, however careful people are.D People who take unnecessary risks can endanger others as well as themselves.E Being adventurous does not necessarily mean taking risks.Key: BJustificationThe explorer claims that young people should be encouraged to be more adventurousbecause it benefits them, but does not actually state what the benefits are. B suggests thatbeing adventurous (which probably involves taking some risks) would benefit young peopleby helping them learn to deal with dangerous situations, thereby strengthening the explorer’sclaim.DistractorsA does not strengthen the claim – the fact that some youngsters are more courageous thanothers is not a reason for all young people to try to be more adventurous.C does not strengthen the claim – the explorer has not said anything about accidents.D does not strengthen the claim – if anything it may weaken it, although the explorer has notactually advocated taking unnecessary risks.E pre-empts a possible objection to the claim (i.e. that young people should not beencouraged to engage in risky behaviour), but does not strengthen the claim independentlyof this.7 Before setting out on a long climb, a group of climbers was told by the guide: “Anyone who hasnot started climbing by 4:00 am will not reach the summit.”If the guide’s prediction was right, which one of these sentences must have been true?A All the climbers who started before 4:00 am reached the summit.B Some of climbers who started before 4:00 am reached the summit.C None of the climbers who started after 4:00 am reached the summit.D Only the climbers who reached the summit started before 4:00 am.E All the climbers who did not reach the summit started after 4:00 am.Key: CJustificationIf a climber who left after 4:00 am reached the summit, the guide’s prediction would havebeen incorrect. If it was correct, therefore, no one who left after 4:00 am can have reachedthe summit.DistractorsA is not necessarily true – the guide’s prediction does not rule out climbers starting before4:00 am but nevertheless failing to reach the summit.B is necessarily false – if this were true, the guide’s prediction would have been false.D is not necessarily true – as in A, the guide’s prediction does not rule out climbers startingbefore 4:00 am but nevertheless failing to reach the summit.E is equivalent to A.Test B: Problem Solving1 A farmer has equal numbers of cows, sheep and chickens. He sells half of the sheep and onethird of the chickens, he then buys 10 goats and 3 cows. The farmer now has a total of 39animals.How many cows does the farmer now have?A 12B 13C 14D 15E 16Key: DJustificationBefore buying the ten goats and 3 cows, the farmer had 26 animals. This is the remainderafter half of the sheep and one third of the chickens have been sold. Since we know thatoriginally the numbers of cows, sheep, and chickens were the same, this gives x + x/2 + 2x/3= 26, where x equals the original number of cows. Solving for x gives 12 cows originally, andadding the extra 3 cows gives a final answer of 15.2 Below is a summary of all the second-hand cars sold by Bargain Cars during 2012 and 2013:Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec2012 85 83 98 102 118 135 88 97 116 83 125 1282013 123 106 87 114 90 106 124 113 131 77 92 75Which month of 2013 saw the biggest increase in sales compared with the previous month?A AprilB JuneC JulyD SeptemberE NovemberKey: AJustificationThere was an increase of 27 from March to April 2013; this was the only increase of 20 ormore during 2013.3 The pattern below has a number of same size circles arranged in a reducing square.Which graph represents the number of each sized circle?ABCDEKey: EJustificationThere are four sizes of circle. The numbers of each, in ascending order of size, are 20, 16,32, and 12. The heights of the bars in E correspond to these values, from left to right.Test B: Critical Thinking4 In general, having a larger brain is a sign of greater intelligence. Humans are more intelligentthan other primates and their brains are also significantly bigger. Birds, however, have tinybrains, but they are also very smart. Crows can use tools, songbirds seem to have a primitivelanguage, and parrots can learn human speech. Birds typically have much smaller brains thanmammals, and yet are often a lot smarter – especially when it comes to smaller mammals.Which one of these sentences can be concluded from the above information?A Birds are not as intelligent as they appear to be.B The only way to measure a creature’s intelligence is to observe its behaviour.C Brain size is not the only factor that determines how intelligent a creature is.D Birds are able to do things that mammals are not able to do.E The most intelligent birds will be the ones with the biggest brains.Key: CJustificationGiven that birds have smaller brains than many mammals but are often a lot smarter, brainsize cannot be the only factor that determines how intelligent a creature is.DistractorsA cannot be concluded – nothing in the passage would support this.B cannot be concluded – whilst some support is offered for a claim that observing behaviouris a better method of measuring intelligence than observing brain size, it does not follow thatit is the only method that could yield accurate results.D cannot be concluded – whilst it is certainly true, it does not follow from anything in thepassage.E cannot be concluded – nothing in the passage would support this.5 Afifa and Zara are looking at an exhibit in a modern art gallery. The exhibit is a brick hangingon a thin piece of string above a bird’s egg. Afifa likes it, but Zara says: “You can’t call that ‘art’,whether it is in an art gallery or not. Anyone can tie string round a brick. There’s no skillrequired.”Which one of these sentences has to be true for Zara’s argument to be correct?A Not everyone likes the same kind of art.B Anything that takes skill is a work of art.C Anyone can produce a work of art.D A work of art must involve some skill.E Anything found in an art gallery is art.Key: DJustificationZara asserts that the exhibit is not art solely on the basis that it did not require skill toproduce. For this to be justified, it must be the case that a true work of art must require someskill.DistractorsA does not have to be true – the question of who likes what kind of art is not relevant toZara’s argument.B does not have to be true – Zara says skill is necessary to produce art, but it does notfollow that taking skill is enough to make something art.C does not have to be true – in fact it is contradicted by what Zara says.E does not have to be true – in fact it is contradicted by what Zara says.6 Sarvar and Ona are talking about their parents. Sarvar says: “My parents are too strict. I am notallowed time on my computer or to play outside until I have done my homework. I think theyshould let me decide what the best time to do my homework is. I know best.”Which one of these facts would make Sarvar’s argument stronger?A Sarvar’s parents know that he can be lazy and prefers playing to homework.BMost other children at Sarvar’s school have to do their homework as soon as they gethome.C Ona is allowed to do her homework in the evening after a meal.D Sarvar is very tired after school and can work better after a break.E Doing homework is very important to help children do well at school.Key: DJustificationSarvar claims that his parents should let him decide when to do his homework, but does notoffer any reason for this other than “I know best”. D provides a more substantial reason whyallowing him to do so would be a good idea – it might actually improve the quality of hiswork.DistractorsA may weaken Sarvar’s argument, as it suggests he might not actually do his homework ifleft to decide for himself.B may weaken Sarvar’s argument, as it suggests that his parents may not actually beunusually strict.C does not strengthen Sarvar’s argument – we do not know anything about Sarvar andOna’s situation which would suggest they ought to follow the same rules.E does not strengthen Sarvar’s argument – the question is when, not whether, thehomework should be done.7 My dentist put a sign in her clinic saying: “If you are aged under 18 and attend my clinic at leastonce a year, you will need fewer extractions than if you don’t.” I don’t attend as often as everyyear, but my brother does. My sister attends every 6 months. We are all aged under 18.What can we expect if the dentist is right?A My brother and sister will both need more extractions than me.B My sister will need fewer extractions than my brother.C My brother and sister will both need fewer extractions than me.D My brother will need more extractions than my sister but fewer than me.E My sister will need fewer extractions than me but more than my brother.Key: CJustificationI do not attend the dentist every year, but both my brother and sister do. If what the dentistsays is true, they will both need fewer extractions than me.DistractorsA is the opposite of what the dentist predicts.B would be true if going to the dentist every six months was better than going every year, butthe dentist does not make this claim.D assumes a straightforward correlation between frequency of visits and number ofextractions for the three siblings.E does not follow from what the dentist says – there is no reason my sister would need fewerextractions than my brother.Test C: Problem Solving1 A picture 40 cm high by 30 cm wide is to be framed. There will be a border between the edge ofthe picture and the frame. This border will be 6 cm wide at the top and sides, and 9 cm wide atthe bottom. The width of the wood used for the frame is 2 cm.What is the overall height of the framed picture?A 46 cmB 49 cmC 56 cmD 59 cmE 62 cmKey: DJustification:Height of picture 40 cm; top border 6 cm; bottom border 9 cm; frame 2 x 2 cm.Total height 59 cm.2 A computer game involves the capturing of three types of mythical creatures: Arps, Orps andUrps.Arps have 6 legs, 3 horns and a tail.Orps have 4 legs and 2 horns, but no tail.Urps have 3 legs and a tail, but no horns.The last time Billy played this game he captured 45 creatures with a total of 222 legs, 99 hornsand 33 tails.How many of the 45 creatures that Billy captured were Urps?A 8B 12C 15D 20E 25Key: AJustification:33 of the creatures had a tail, so there were 12 Orps, which account for 24 of the horns. Theother 75 horns must belong to the Arps, so there were 25 Arps, and therefore 8 Urps.3 The following net is folded up to make a cube.At how many corners of the cube do exactly two of the diagonal lines on the faces meet?A 2B 3C 4D 5E 6Key: CJustification:Numbering the vertices of the cube gives the following:Exactly two diagonal lines meet at corners 1, 3, 5 and 7.Test C: Critical Thinking4 When drugs known as antibiotics are used to treat a particular disease they kill off most of thebacteria that cause the disease, and the patient recovers. But any bacteria that survive thetreatment are, obviously, the ones that were able to resist the power of the drug. Every time thedrug is used, more and more of the resistant bacteria are left alive to reproduce and pass ontheir genes. Because bacteria evolve much more quickly than humans, it takes only a fewdecades before all or most of the bacteria which cause that particular disease have becomeresistant to the drug.Which one of the following is a conclusion which can be drawn from the above passage?A If antibiotics are used too freely, they eventually stop being effective treatments.B In several decades there will be no way to fight diseases caused by bacteria.C Antibiotics are the most effective way of treating infectious diseases.D Doctors who regularly prescribe antibiotics are irresponsible.E There is no long-term medical solution to the problem of drug-resistant bacteria.Key: AJustification:The passage explains how bacteria start to become drug-resistant, and how resistanceincreases with repeated treatments. It follows from this that if antibiotics are used too often,they will cease to be effective treatments.DistractorsB is too general, and too extreme. It goes beyond the specific case of antibiotics.C might be thought to follow from the first sentence of the passage, but the author neithersays nor implies anything about the comparative effectiveness of treatments.D is sometimes claimed in connection with this topic, but it is not supported by this particularpassage.E (like B) is too extreme. It ignores alternative treatments.5 Lamarck was a 19th century scientist who believed that modifications in an animal’s bodyduring its lifetime could be passed on to its offspring: for example, he thought that a giraffewhich lengthened its neck by stretching could pass on the characteristic of a longer neck. But,in common with other 19th century scientists, Lamarck did not know about genes. When agiraffe stretches, it may alter its own body, but it does not alter its genes. So the fact that itstretches cannot affect the length of its offspring’s neck.Which one of the following is an assumption underlying the above argument?A Giraffes with longer necks are better adapted to their environment.B The genes of a species can change only over a long period of time.C Offspring can inherit characteristics from their parents only through genes.D Giraffes cannot alter the length of their necks by stretching.E Nineteenth century scientists thought that animals could deliberately change theircharacteristics.Key: CJustification:The passage concludes, based solely on the fact that stretching does not alter genes, thatthe effects of stretching cannot be passed on to offspring. This is justified only if it isassumed that genes are the only means by which characteristics can be inherited.DistractorsA does not need to be assumed – the actual reasons for, or benefits of, modifications are notdiscussed.B does not need to be assumed – the fact that stretching does not alter a giraffe’s genes isstated.D does not need to be assumed – it is the mechanism by which longer necks are passed on,rather than how they originate, that is the subject of the argument.E does not need to be assumed – it is not stated whether the animals are changing theircharacteristics deliberately, and in any case the views of other scientists on this matterwould not be relevant.6 Young people are involved in the proposals for a dedicated children’s facility at a majorhospital. This facility should be built as a matter of urgency. Project leaders say, “it isimperative that we have a facility that focuses on the needs of teenagers and young adults.Although the clinical facilities and staff here are excellent, we currently have to treat childrenalongside adults: two thirds of young outpatients are seen in adult clinics. A dedicated facilitywould mean that we could see all our patients in the right environment.”Which one of the following, if true, most weakens the above argument?A A shortage of available land may make it difficult to build the proposed facility close to theexisting buildings.B Young people are less likely than adults to understand the issues involved in a project ofthis sort.C Young people are not disadvantaged by being treated in the same facility as adults.D An adult facility is unlikely to have medical staff specially trained to work with children.E A separate facility would necessitate an increase in staff, which would be more expensiveeven if they were available.Key: CJustification:The passage argues that the children’s facility should be built as a matter of urgency, on thebasis that at present many young people are being seen in adult clinics. This is only justifiedif we assume that the current state of affairs is having some negative effect. C, if true,undermines this assumption, seriously weakening the argument.DistractorsA does not weaken the argument unless we also assume that the distance between the twofacilities will have significant negative effects.B does not weaken the argument, as the fact that young people are involved in the project isnot an element of the reasoning in the passage.D does not weaken the argument, and in fact may strengthen it, as it provides grounds tobelieve that the current state of affairs is having some negative effect.E does not independently weaken the argument, as there is no reason given to think that thebenefits of the new facility would not justify any increased cost.7 Three balls – each of which is either red or yellow – lie in a straight line on a pool table. Azizstrikes the first ball, which is red. That ball strikes the middle ball. The middle ball then strikesthe last ball, which is yellow.On the basis of this information, which one of the following statements must be true?A Only one of the balls was red.B A red ball struck a yellow ball.C A yellow ball struck a red ball.D Only one of the balls was yellow.E We do not have enough information to know any of the above.Key: BJustification:We do not know the colour of the middle ball. The solution can be seen by considering thetwo possibilities in turn: (1) that the middle ball is yellow, in which case the first ball (red)strikes the second ball (yellow), making B true; or (2) that the middle ball is red, in whichcase the middle ball (red) strikes the last ball (yellow), also making B true.DistractorsA may not be true – if the middle ball were red, two of the balls would be red in total.C is actually impossible.D may not be true – if the middle ball were yellow, two of the balls would be yellow in total.E is not true, as we have enough information to know that B is true. Darsliklar 80 1 2 3 4 5 Жалоба 63 0 26-11-2023, 11:00