[PDF] ICAS Practice Questions Science Paper D.pdf | Plain Text

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ICAS Science Practice Questions Paper D © EAA 2 1. The table gives information about rocks gathered on a beach. Shape Length (cm) Colour flat disc-like 6½ silver grey and black patches egg-like 5pinkish white with black glassy spots rounded disc-like 4glassy white egg-like 3white with black spots Which two shapes describe the four rocks? (A) round, spotty (B) white, black (C) disc, egg (D) dull, glassy 2. To recycle waste, things must be sorted into groups according to what they are made of. Here is a drawing of some of the things found in a recycling bin. flat containers ron containers lare containers sall containers  aer nles etal containers lastic containers lass containers lare containers sall containers aer nles etal containers flat nles ron nles lastic containers lass containers  Soft                              S  S   S aer aer aer aaines soin as lass etal lastic lastic S   Soft                            S S   S  aer aer aer aaines soin as lass etal lastic lastic S Below are different ways of sorting these things. Which method of sorting would group these items for recycling? (A) large containers, small containers, flat containers, round containers (B) plastic containers, glass containers, paper bundles, metal containers (C) large containers, small containers, paper bundles, metal containers (D) plastic containers, glass containers, flat bundles, round bundles

3 ICAS Science Practice Questions Paper D © EAA 3. Metal alloys are mixtures of two or more metals. The strength of metal alloys is measured by the force required to push them permanently out of shape. The graph compares the strength and weight of some metal alloys. T S R Q Metal alloy Increasing strength and weight    The frame of a racing bicycle needs to be both strong and lightweight. Which metal alloy would be best suited to making frames for racing bicycles? (A) T (B) S (C) R (D) Q 4. Many of the world’s bird species have become so few in number that they are threatened with extinction. Some have already become extinct in the wild. The graph categorises the proportions (and gives numbers) of bird species that are threatened. extinct in the wild (3) critical (182) endangered(321) vulnerable (680) Approximately what fraction of the world’s threatened bird species are categorised as critical or endangered? (A) 1 tenth (B) 4 tenths (C) 5 tenths (D) 6 tenths

ICAS Science Practice Questions Paper D © EAA 4 5. Materials with a colour that absorbs the Sun’s heat are best for solar heaters. Materials with a colour that reflects the Sun’s heat are best for summer clothing. Some students set up an experiment to investigate the effect of the Sun’s heat on paper of various colours. The students made five cups using paper. All the paper was of the same type but with different colours. They left the five cups in a sunny place for a number of hours.   Purpose    Solar hot water hea\nters  Summer cricket clot\nhing   green  yellow   green  red   yellow  red   yellow  green (A) (B) (C) (D) thermometer paper cup coloured paper l\bd of coloured paper   Purpose    Solar hot water he\naters  Summer cricket clo\nthing   green  yellow   green  red   yellow  red   yellow  green (A) (B) (C) (D) thermometer paper cup coloured paper l\bd of coloured paper 1 45 40 35 30 25 20 15 2 34 black green red yellow wh\bte Temperature (°C) T\bme (hours) 0 10 1 45 40 35 30 25 20 15 2 34 black green red yellow wh\bte Temperature (C ) T\bme (hours) 0 10 After 2 hours the difference in the temperatures of the black cup and the white cup was (A) 17 °C. (B) 20 °C. (C) 28 °C. (D) 37 °C.

5 ICAS Science Practice Questions Paper D © EAA For questions 6 and 7 use the information below. Some students tested four white powders. The table gives their results. Powder Test Do the powder and water form a clear mixture? What colour does red cabbage juice turn when the powder is placed in it? Do drops of white vinegar on the powder cause bubbles to form?Do drops of yellow iodine turn black when placed on the powder? cornflour noblue noyes baking soda yesblue yesno washing soda yesgreen yesno epsom salt yesblue nono The students constructed a flow chart to show how they distinguished between the four powders using some of the tests in the table. Do the powder and water form  a clear mixture?   no   yes   yes   yes What colour does red cabba\be juice turn when the powder is placed in it?   blue   blue   green   blue Do drops of white vine\bar on the powder cause bubbles to form?   no   yes   yes   no Do drops of yellow iodine turn blue-black when placed on the powder?   yes   no   no   no Powder cornflour baking soda washing soda epsom salts Test owders       and  owders     and  owder  id the powder disso\hl e in water to form a clear mi \hture id drops of white  i\hnegar on the powder cause bubble\hs to form hat colour did red \hcabbage  uice turn when the powder is pl\haced in it yes owders   and  yes no owder  no owder  \breen owder  blue 6. Which substance is powder S? (A) cornflour (B) baking soda (C) washing soda (D) epsom salt 7. The students did not use the test for identifying powders containing starch to make their flow chart. Which powder contained starch? (A) Q (B) R (C) S (D) T

ICAS Science Practice Questions Paper D © EAA 6 8. Viscosity is a measure of a liquid’s thickness and stickiness. The more viscous the liquid, the longer it takes for an object to pass through it. Generally, the viscosity of a liquid decreases as temperature increases. The diagram shows the distances clay balls of the same size pass through four motor oils in the same time. The four oils were at the same temperature. W XYZ When cold, high viscosity motor oil may not get to the part of the engine it is supposed to protect. When hot, low viscosity oil may not protect engine parts because it does not stick to them. Which motor oil would be best for protecting engine parts at high temperatures? (A) W (B) X (C) Y (D) Z 9. The graph shows the average distance from the Sun and the average daytime temperature for some planets in the solar system. KEY average distance f\lrom Sun (million km ) average da time tem\l erature ( ) ercur enus \    art ars Generally, the further a planet is from the Sun, the colder will be its average daytime temperature. According to the graph, which planet does not follow this trend? (A) Mercury (B) Venus (C) Earth (D) Mars

7 ICAS Science Practice Questions Paper D © EAA 10. The diagrams below show the relationship between the numbers of producers and consumers in two food chains. Producer Primary  Consumer Secondary  Consumer means “gets eaten by\t”   KEY Increasing numbers \tof indi\biduals seeds and grass rabbitscats Food chain one  seeds and grass rabbits cats Increasing numbers \tof indi\biduals trees caterillars birds Food chain o trees birds caterillars Which of the following statements is supported by the information above? In a food chain (A) there are more primary consumers than there are secondary consumers. (B) there are more primary consumers than there are producers. (C) primary consumers are larger than secondary consumers. (D) primary consumers are usually insects that eat plants.

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ICAS Science Practice Questions Paper D © EAA QUESTIONKEYKEY rEa SONINg LEVEL OF DIFFICULTY 1 CSome rocks are flat while others are rounded, but all are either disc-like or egg-like. Easy 2 BAccording to the introduction, “to recycle waste, things must be sorted into groups according to what they are made of ”. Labels on the diagram show what the things are made of. Although the items shown could be sorted into different groups according to their characteristics, to get the correct answer, the option sorting them into what they are made of must be chosen: plastic containers, glass containers, paper bundles and metal containers. Easy 3 CThe racing bike needs to be light, so A and B are wrong. The racing bike also needs to be strong, so A and D are wrong. Easy 4 BFrom the graph, the fraction categorised as critical or endangered is smaller than 5 tenths (half) but larger than 1 tenth. Numerically, % 42 1 10 0 3 68 0 32 1 18 2 321 18 2 = × + + + + , about 4 tenths (although students in Year 6 would not be expected to answer this way). Medium 5 ATo find the difference in temperatures of the black cup and the white cup after two hours, you must interpret the graph and calculate the difference. The graph curves represent the changing temperatures of the cups over time. The temperature of the cups at 2 hours is found by locating the intersection of the vertical line from (time) 2 hours on the x-axis and the curve representing each of the temperatures of the black and white cups. The temperatures are found by reading the y-axis values for these intersections. The black cup temperature is 37 °C. The temperature of the white cup is 20 °C. The difference in temperature between the cups is 37 – 20 = 17 °C. Medium 6 DStart at the top of the flow chart and use information from the table. Of the four powders only T (cornflour) does not form a clear mixture with water. Of the remaining three powders, only S (Epsom salts) does not bubble when white vinegar is added. Medium 7 DThere are four tests; (1) mix with water, (2) mix with red cabbage juice, (3) mix with white vinegar and (4) mix with yellow iodine solution. Starting at the top of the chart, test 1 is performed, and then test 3 and finally test 2. This means that test 4 is the test that was not performed and so it must be the test that indicates the presence for starch. From the table, this last test indicated that cornflour is the only substance that contains star ch. The next step is to identify which substance (Q, R, S or T) is cornflour. From the table, cornflour is the only substance that does not form a clear mixture with water. Start at the top of the flow chart. Of the four powders only T does not form a clear mixture with water. Hence, powder T is cornflour and contains starch. Medium/Hard 8 DThe question only refers to high temperatures. The oil with the greatest viscosity is needed as this type of oil will best stick to the engine parts at high temperatur es. The oil with the greatest viscosity is the one in which the ball travels the smallest distance in the same time i.e. the ball drops through it the slowest. Medium/Hard 9 BTo answer the question, we have to ask the following: as the spotted graph goes up (increasing distance away from the Sun), does the purple graph (average daytime temperature) always go down? The average daytime temperature of Venus is higher (not lower) than Mercury’s average daytime temperature even though it is further from the Sun. It should be noted that the daytime temperature of Mars is below Earth’s daytime temperature. Medium/Hard 10 AIn a food chain the producers are always plants. The graphs representing the two food chains show the number of individuals that are producers, primary consumers and secondary consumers. In food chain one, there are more producers than consumers. In food chain two the size of the individuals matters more than the numbers of individuals. Because the trees are large and the caterpillars are small, few trees feed many caterpillars. However in both food chains, there are more primary consumers than secondary consumers. Hard

ICAS Science Practice Questions Paper D © EAA LEgEND Level of difficulty refers to the expected level of difficulty for the question. Easy more than 70% of candidates will choose the correct option. Medium about 50–70% of candidates will choose the correct option. Medium/Hard about 30–50% of candidates will choose the correct option. Hard less than 30% of candidates will choose the correct option.