TERM 2 EXAM Year 2009/2010 DATE : Tuesday (30-3-2010) TIME : 11.20am-1.20pm (2 hours) SCIENCE YEAR 8
DO NOT OPEN THE QUESTION PAPER UNTIL YOU ARE TOLD TO DO SO
SECTION A
/30
Q1
Q2 Q2
/10
/10
SECTION B Q3 Q4
/10
/10
Q5
/10
SECTION C Q1 Q2
/10
/10
TOTAL /100%
Parents¶ Signature:_____________________
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PAPER 1: OBJECTIVES QUESTIONS SECTION A [30 marks]
1.
The
balsam plant is categorized as a dicotyledon because it has I. a woody stem II. a tap root system III. a fibrous root system A. B. C. D.
I only II only I and II only II and III only
2. Which of the following animals are warm-blooded? A. Bat, pigeon, lion B. Snake, bat, turtle C. Tortoise, snake, frog D. Whale, snake, frog 3. Diagram 1 s hows the classification of living t hings. Living Things
K
L
Flowering Plant
M
Invertebrates
N
Diagram 1
Which of the following represents M and N corr ectly? M A. B. C. D.
Plants Non-flowering plants Plants Non-flowering plants
N Non-flowering plants Vertebrates Animals Animals
4. Which of the following plants do not carry out p hotosynt hesis? A. Moss B. Ferns C. Fungus D. Algae 5. What is t he definition of biodiversity? A. The variety of non-living organisms and living organisms on Eart h B. The prescence of variety among living organis ms C. The various type of flora only D. The various type of fauna only
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6. Diagram 3 s hows the classification of vertebrates. Vertebrates
Fish
Reptiles
X
Birds
Amphibians
Diagram 3
Which of the following options could X be? A. Shark B. Goose C. Whale D. Tortoise 7. A plant has possesses t he characteristics stated below. y y y
Woody stem Tap root system Leaf has network veins
Which of the following plants do t he above statements describe? I. II. III. A. B. C. D.
Balsam plant Paddy Rose I and II only I and III only II and III only I, II, and III
8. Which of the following c haracteristics is not c haracteristic of t he bird family? A. Body covered wit h feat hers B. Are warm blooded C. Breathe through the lungs D. Fertilise externally. 9. Which of the following interactions would demonstrate a parasitic relations hip? A. Hermit crab and sea anemone B. Tapeworm and human intestine C. Remora fis h and s hark D. Green alga and fungus 10. Owls and snakes are reared in oil pal m plantations to A. B. C. D.
Control pests Help pollination Reduce grass and weeds Increase t he content of carbon dioxide
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11. Which of the following will not destroy t he balance of t he ecosystem? A. Logging B. Mining C. Conservation of forests D. House construction 12. Which of the following statements explains w hy should logging by humans be stopped? A. Causes pollution in coastal areas B. Decreases t he content of oxygen in t he air C. Causes acid rain D. Increases t he likelihood of haze in the air 13. In which of the following places will a wet piece of clot h dry faster? A. A shaded area B. A windy area C. Under t he sunlight and in a windy area. D. In a dry and s haded area 14. Which of the following tests demonstrate t he presence of pure water? I. Changes anhydrous copper sulp hate from white to blue II. Changes anhydrous cobalt c hloride paper from blue to pink III. Changes red litmus paper to blue A. B. C. D.
I and II only I and III only II and III only I, II, and III
15. Which of the following organic solvents cannot be used to remove oil from clot hes? A. Turpetine B. Ether C. Kerosene D. Alcohol 16. Which of the following word equations is incorrect? A. Sulphuric acid + calcium hydroxide calcium sulphate + water B. Zinc + hydroc hloric acid zinc chloride + hydrogen C. Calcium carbonate + hydrochloric acid calcium chloride + hydrogen + water D. Sodium hydroxide + ammonium c hloride sodium c hloride + water + a mmonia 17. Which of the following substances is acidic? A. Tooth paste B. Soaps C. A Car battery D. Fertilizers 18. Which of the following natural sources of wat er have t he most dissolved substances? A. Rain water B. Well water C. Spring water D. Sea water
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19. The solubility rate of substances depend on I. II. III. A. B. C. D.
The
size of t he solute The volume of t he solvent The temperature of t he solvent I and II only I and III only II and III only I, II, and III only
20. Which of the following c hanges in state takes place at t he melting point of water? A. Solid to liquid B. Liquid to solid C. Liquid to gas D. Gas to liquid 21. In fishing boats salt is often added to t he ice when storing fis h on its long voyages. Please select t he most likely reason for doing so? A. To kill t he bacteria in the box o B. To maintain t he temperature of t he ice at 0 C C. To soften t he ice D. To lower t he melting point of ice 22. Which actions will cause t he boiling point of water to rise? I. II. III. A. B. C. D.
Adding common salt to pure water Raising t he air pressure Raising t he volume of water I and II only I and III only II and III only I, II and III
23. Which statement about t he electrolysis of water is correct? A. The gas given off at t he cathode is oxygen B. The gas given off at t he anode is hydrogen C. The gas given off at t he cathode has a pH value of 7 D. The gas given off at t he anode turns lime water cloudy 24. Some common salt is added to a pot of curry. W hich action does not increase t he rate of solubility of the salt? A. Increasing t he heat B. Stirring the curry C. Adding more water D. Using a bigger pot 25. Petroleum gas used for cooking is stored in gas tanks often under high pressures. W hy? A. Petroleum gas can be stored in its liquid state B. The gas can be used easily C. The size of t he gas particles can be reduced D. The gas cannot expand 5
26. Which of the following statements about air pressure is true? A. Air pressure acts equally in all directions B. The air pressure increases wit h height C. Air pressure down certain t hings only on t he Eart h¶s surface D. Air pressure does not c hange from one place to anot her 27. Which device uses t he principle of air pressure to empty a liquid from a tank? A. The barometer B. The hydraulic pump C. The siphon D. The plunger 28. The air pressure in an enclosed container increases w hen I. The container is heated II. The container is placed in a cold room III. More air is pumped into t he container A. B. C. D.
I and II only I and III only II and III only I, II, and III
29. The condensed milk in a can does not flow out alt hough a hole has been punc hed on t he lid. What should be done to t he can of condensed milk? A. Punc h another hole in t he can B. Shake t he can vigorously C. Heat the can wit h a strong flame D. Soak the can in hot water 30. Which of the following is a safety measure w hen using a gas tank? A. Turn on t he gas before lig hting t he match B. Check the pipe connection using water C. Keep the gas tank away from fire D. Keep the gas tank in a closed cupboard
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PAPER 2: STRUCTURED QUESTIONS SECTION B [50 marks] Answer all the questions.
1.
The chart
in Diagram 4 demonstrates t he classification of vertebrates. Vertebrates
Fish
Reptile
Bird
X
Y
Diagram 4
(a) State the definition of vertebrates.
_____________________________________________________________
[2 marks]
( b) Veterbrates can be classified into f ive main groups w hich are fish, reptile, bird, and t he other two. Name the groups of animals X and Y. X:___________________________________________________________ Y:___________________________________________________________
[4 marks]
(c) State two characteristics of i.
Reptiles. _______________________________________________________
ii.
Fish.
2.
Table
_______________________________________________________
1 s hows t he size of various populations of organisms in a Organism W X Y Z
[4 marks]
habitat.
Number of Organism 500 5000 5 15 Table 1
(a) Based on Table 1, identify t he population of organism w hich would be best correspond to t he tropic levels indicated below. i.
Producer:________________________________________________ 7
ii
Pr i
ry consumer :
iii
econdary consumer :
i
Ter tiary consumer :
[4 marks]
b) Based on your answers in a), draw a typical food chain found in the a typical habitat e.g. dog, cat, eagle«.).
[2 marks] c) What happens to the populations of W and Y if is captured? State why? W: Y:
[4 marks]
3. Diagram 5 shows the set up exper iment. A few drops of dilute hydrochlor ic acid were added from the burette into the alkali solution in a conical f lask.
Di
Table 2 shows the result of the exper iment B
tt di l ( l)
iti l
di
10 T
Fi
l
di
35
l
a) Name the laboratory techni ue used in the exper iment.
_____________________________________________________________
[1 mark]
b) What happens if more hydrochlor ic acid is added to the alkali solution?
_____________________________________________________________
[2 marks]
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(c) i. Name the process that takes place when the acid reacts with alkali.
_____________________________________________________________
[2 marks]
ii. What is the volume of hydrochlor ic acid used to neutralise the alkali. ____________________________________________________________ iii.
_
[1 mark]
How would you know that excess hydrochlor ic acid is added to the alkali solution? _____________________________________________________________
iv.
[2 marks]
Wr ite down the equation for the reaction.
+
+ [2 marks]
4. Diagram
shows two ways to dry clothes.
Q
P
Di
6
(a) What is the process of drying clothes called?
_____________________________________________________________
[2 marks]
( b) Based on Diagram , what factors alter the rate of evaporation used to dry clothes in P: ___________________________________________________________ Q:
___________________________________________________________
[4 marks]
(c) What is the difference between evaporation and boiling? ___________________________________________________________ ___________________________________________________________ [4 marks] 9
5. Diagram 7 shows a man sucking an orange juice wit h a drinking straw.
Diagram 7
(a) State three factors t hat aff ec the air pressure.
i.
__________________________________________________________
ii.
__________________________________________________________
iii.
__________________________________________________________
[3 marks]
( b) In Diagram 7, why does t he drink enter t he straw when you suck on t he straw?
_____________________________________________________________
[3 mark]
(c) If there is a hole in t his straw, can water be sucked up? Explain? _____________________________________________________________ _____________________________________________________________
_____________________________________________________________
[2 marks]
(d) Give two examples of devices t hat applies a concept similar to t he drinking straw. 1.____________________________________________________________ 2.____________________________________________________________
[2 marks]
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SE
T
Answ
all t ¢
¡
e que sti ns £
1. A pupil carr ies out an exper iment to show the proper ties of acids and alkalis. He puts both red and blue litmus paper into test tubes that are f illed with dilute hydrocholor ic acid and dilute sodium hydroxide solution.
P
Q
Di
8
(a) State the var iables in this exper iment i.
Mani pulated var iables:
________________________________________
[1 mark]
ii.
R esponding var iables:
________________________________________
[1 mark]
( b) Complete the table 3 below by recording the observation in both test tubes. T tT
d Lit
T
p
Bl
Lit
p
l
[2 marks]
(c) Based on the result of this exper iment, state two conclusions that can be drawn. 1._____________________________________________________________ 2._____________________________________________________________
[2 marks]
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(d) Then a piece of magnesium r i bbon is put into the test tube containing hydrochlor ic acid. A burning wooden splinter is brought close to the mouth of the test tube as shown in Diagra m 9.
Di
i.
State the observation that can be drawn from this exper iment. Why?
ii.
9
_________________________________________________________
[2 marks]
Name the gas that is produced.
_________________________________________________________
[2 marks]
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2. Diagram 10 shows an exper iment demonstrating the electrolysis of water.
Di
(a) Name the two elements that compr ise a molecule of water
_______________________________________________________________
[2 marks]
( b) Def ine electrolysis
_______________________________________________________________
[1 mark]
(c) Based on the diagram above, i.
What is gas Y?
ii.
________________________________________________________
[1 mark]
What will happen if gas X is exposed to a burning wooden splinter
iii.
________________________________________________________
[1 mark]
What is the ratio of volume gas X to Y collected at cathode and anode.
________________________________________________________
[1 mark]
(d) Why sul phur ic acid is added to the beaker before star ting this exper iment?
______________________________________________________________
[1 mark]
(e) If the process of electrolysis continues for one day, will the water level in the beaker increase of decrease? Why? ______________________________________________________________
______________________________________________________________ E D
[3 marks] 13
