Download Half-yearly Exam

KWUN TONG GOVERNMENT SECONDARY SCHOOL
Half Yearly Examination 2004-2005
Integrated Science
Class
: S.2 (
)
Name
: _______________________
Class No.: ________
Max. Mark
Date
Time
: 100
: 18-1-2005
: 8:45-9:45am
Answer all of the questions on the answer sheet provided.
(A)
Multiple Choice (20 marks)
1.
Which of the following is not needed in photosynthesis?
A.
2.
3.
light
B.
oxygen
C.
chlorophyll
The final product made in photosynthesis is
A. carbon dioxide.
B. starch.
C.
D.
alcohol.
carbon dioxide
D.
Classify the following living things into producer, primary consumer and secondary consumer
in a food chain.
Bird
Grass
Grasshopper
A.
B.
C.
Producer
Grasshopper
Grasshopper
Bird
Primary consumer
Bird
Grass
Grass
Secondary consumer
Grass
Bird
Grasshopper
D.
Grass
Grasshopper
Bird
Directions: Questions (4) to (6) refer to the table below.
There are 4 bottles each containing a different gas:
4.
water.
Gas W
Gas X
Gas Y
Gas Z
Breathed air Unbreathed air Carbon dioxide
Oxygen
Which bottle of gas can relight a glowing splint in the shortest time?
A. Gas W
B. Gas X
C. Gas Y
D. Gas Z
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5.
Which bottle of gas should be used to put out a fire?
A. Gas W
B. Gas X
C. Gas Y
D.
Gas Z
6.
If a burning candle is put into each bottle, which bottle’s candle will go off in the
shortest time?
A. Gas W
B. Gas X
C. Gas Y
D. Gas Z
7.
Burning can produce:
(1) light energy
(2) heat energy
A. (1) and (2) only B. (2) and (4) only
(3) food
(4) carbon dioxide
C. (1), (2), and (4) only D. (1), (2), (3) and (4)
8.
Which of the following represents gases in the correct order of decreasing proportion in the air?
A. nitrogen, oxygen, carbon dioxide, inert gases
B. carbon dioxide, inert gases, nitrogen, oxygen
C. inert gases, carbon dioxide, oxygen, nitrogen
D. carbon dioxide, inert gases, oxygen, nitrogen
9.
Which description about air is correct?
A. It can change lime water milky.
C. Breathed air contains no oxygen.
B.
D.
It contains many different gases.
It is white in colour.
10. Gas A can turn lime water milky while Gas B cannot relight a glowing splint and cannot turn
lime water milky. What are Gas A and Gas B?
Gas A
Gas B
A. Carbon dioxide Nitrogen
B. Nitrogen
Carbon dioxide
C. Carbon dioxide Water vapour
D. Water vapour
Nitrogen
11. Where does gaseous exchange take place in fish?
A. lungs
B. gills (鰓)
C. skin
D.
nose
12. Which of the following is NOT a possible harmful effect of cigarette smoking?
A. Smokers cough less frequently than non-smokers.
B. Teeth and fingers turn yellow.
C. The chance of suffering from heart disease increases.
D. Hair and clothes smell unpleasant to others.
13.
Which of the following statements about nitrogen oxide is INCORRECT?
A. It can cause brain damage in children.
B. It is a poisonous gas.
C. It forms acid rain.
D. It causes lung diseases.
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14.
15.
Which of the following is the circuit symbol of a light bulb?
A.
B.
C.
D.
B
Which of the following is a proper arrangement of an ammeter?
A.
B.
C.
D.
16. The four wires, each made of different metals, are of the same diameter and length. Their
resistance is shown in the following table. Which wire is the BEST conductor among them?
Wire
Resistance ()
A
0.018
B
0.012
C
0.01
D
0.02
17.
18.
Which of the following quantities is measured in the unit ?
A. Current
B. Power
C. Resistance
D.
Voltage
What is the use of the following device?
A. It supplies electrical energy.
C. It measures the voltage.
B.
D.
It ensures the direction of the current.
It makes the resistance of a circuit adjustable.
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19.
20.
Which of the following is a proper arrangement for measuring the voltage across the light
bulb?
A.
B.
C.
D.
Which of the following circuits is different from the others?
A.
B.
C.
D.
(B) True or False Statements (10 marks)
Write 'T' for a true statement and 'F' for a false one.
1. During photosynthesis, chlorophyll combines sunlight and starch.
2. Butter has higher energy content than cabbage.
3. If you eat less than you need, you will put on weight.
4. Humans are producers in the food chain because they can make different kinds of food.
5. Breathing occurs in everybody’s cell to support body activities.
6. Green plants help to maintain the balance of carbon dioxide and oxygen in nature by
respiration.
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7.
8.
The nicotine in cigarette smoke can cause addiction to cigarette smoking.
Of the same length and thickness, the resistance of a copper wire is larger than that of a
nichrome wire.
9. All non-metals cannot conduct electricity.
10. The red terminal of an ammeter should be connected near the positive pole of a dry cell.
(C)
Fill in the blanks (20 marks)
1.
(a)__________________ in cigarette smoke reduces the amount of oxygen in blood.
2.
Breathed air contains more (b)
and (c)
than
unbreathed air. Its temperature is (d) ____________ than that of unbreathed air.
3. (e)____________ and (f)____________ are the products of photosynthesis.
4.
5.
6.
7.
8.
9.
About 78% of air is (g)__________________.
Food chains start with (h) ______________.
(i) _________ , (j) ______________ and oxygen forms the fire triangle.
(k) _______________ in plants can absorb light that is needed for photosynthesis.
(l) ________ can cause brain damage in children.
We draw diagrams with symbols that represent the electrical components. Such diagram is
called a (m)
.
10. The current flowing in the main loop of a circuit is the sum of the currents flowing in the
(n)____________.
11. In a circuit, the same current flows through components connected in (o) ___________.
12. To measure the voltage across a cell, the black terminal of the voltmeter should be connected
to the (p) _________ pole of the cell.
13. (q) ___________ is a measure of opposition of the flow of electricity.
14. Current flows only if the circuit is (r) ___________.
15. There is a large number of (s) __________________ in a good conductor that allows the
flow of electric current.
16. The volume controller of a radio is a (t) ______________.
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(D)
1.
2.
Matching (10 marks)
Column A
Respiration
Control experiment
3.
Respiration and photosynthesis in nature C.
4.
Boil leaf in hot water for 2 minutes
D.
5.
Put the leaf in hot alcohol
E.
6.
Drop some iodine solution on the leaf
F.
7.
Electric circuit
G.
8.
9.
Switch
Parallel circuit
H.
I.
A.
B.
10. Series circuit
J.
Column B
To test for starch
Keep the composition of air in the
atmosphere constant
To dissolve chlorophyll from the
leaf
A circuit that has branches through
which the electric current can flow
A circuit that has only one path
for the flow of electricity
break down food with oxygen to
release energy
A component that can be used to
open or close an electric circuit
To kill leaf cells and soften the leaf
can ensure the results of an
experiment are due to the factor
under investigation only
A complete route which an electric
current can flow around
(E) Short Questions (40 marks)
1.
The following shows a food chain.
Grass
(a)
(b)
Rabbit
Fox
(c)
Write down the food chain. (3 marks)
If the number of rabbit decreases, what happens to the number of fox and grass? Why?
(4 marks)
Where does grass get energy? (1 mark)
(d)
(e)
What is the process of storing energy in grass? (1 mark)
Write down the word equation of the above process. (6 marks)
[Total : 15 marks]
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2.
The following experiment studies the factors needed for photosynthesis. The plant has been
put in darkness for two days before the experiment. Leaf X has no special treatment. Leaf Y is
covered by a black paper and leaf Z is put in a transparent container with some potassium
hydroxide solution (used to absorb carbon dioxide) inside. After a few hours, leaves X, Y and
Z are removed for starch test.
leaf X
leaf Z
leaf Y
potassium hydroxide
solution
(a)
(b)
(c)
(d)
3.
Predict the results of leaves X, Y and Z for starch test. (3 marks)
What is the positive result of the test for starch? (1 mark)
Which leave(s) cannot show positive result in the test for starch? (2 marks)
Explain the above result. (4 marks)
[Total : 10 marks]
Calculate the current flowing through point D. What happens if point D is broken? (6 marks)
3V
0.3 A
0.1 A
A
B
D
E
C
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4.
The following diagram shows two circuits, P and Q. The light bulbs in both circuits are the
same.
(a)
Circuit P
Circuit Q
Which circuit is a parallel circuit? Which one is a series circuit? (2 marks)
(b)
(c)
The bulbs in which circuit would be dimmer? Why? (4 marks)
If the cell supplies a voltage of 1.5 V, what is the voltage applied to the outermost bulb
in circuit P? (1 mark)
(d)
(e)
If one bulb in circuit P burns out, will the other two still light up? (1 mark)
If one bulb in circuit Q burns out, will the other two still light up? (1 mark)
[Total : 9 marks]
END OF PAPER
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