中二 科學試卷 (F2 Science Past Paper)
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內容節錄：
Secondary 2
Instructions:
Belilios Public School
Half-yearly Examination, 2015-2016
Integrated Science
QUESTION PAPER
There are three sections in this paper.
1. Section A (Multiple-choice questions) carries 18 marks.
2. Section B (Fill in the blanks) carries 12 marks.
Time allowed: 1 hour
Maximum Marks: 100
3. Section C (Structured questions) carries 70 marks.
4. Answer ALL questions in this paper. Write your answers in the spaces provided in the
Question-Answer Book.
The diagram below shows five test tubes containing hydrogencarbonate indicator solution originally
red in colour. The green leaves have been destarched before they are placed under light for some time.
aluminium foil
grasshopper
For the leaf in (3).
State the results of the experiment.
Colour of the
Carbon dioxide content
Boiling tube hydrogencarbonate indicator (increase/no change/
(b) If the leaves in (1) and (3) are taken for an iodine test, what will be the colour changes?
For the leaf in (1).
hydrogencarbonate indicator
What is the function of boiling tube (5)?
State one precaution of this experiment.
grasshopper
The diagram below illustrates an air sac inside the lung:
blood low in oxygen
(b) Why do we need oxygen?
Explain why there is carbon dioxide inside our blood.
TAR: 12 mg NICOTINE: 10 mg
SMOKING HARMS
YOUR CHILDREN
HKSAR GOVERNMENT HEALTH WARNING
oxygen carbon dioxide
20 CLASS CIGARETTE
(a) The government has put some warning signs on the packets of cigarettes:
吸煙禍及子女
blood rich in oxygen
red blood cell
blood vessel
(i) Refer to the warning sign on the cigarette package, explain why 'smoking harms your
(ii) How the foetus, a young human being before birth, is affected by its smoking mother.
(b) State THREE harmful substances that enter a person's body when he smokes.
(c) Which substance in cigarettes is addictive?
(d) Which substance in cigarettes lowers the amount of oxygen carried by blood?
The bulb x lights with normal brightness when a cell is connected across it.
normal brightness
The circuit below shows one cell, two switches A and B and two identical bulbs X and Y.
Complete the following table and describe whether, on each situation, the bulb will be brighter than
normal, normal, dimmer than normal or out.
7. After studying an electric torch carefully, Mary drew a diagram showing its internal structure (Fig. a).
plastic casing
lamp filament
metal switch contacts
(b) Why is the metal spring necessary?
slide switch
C-sized cells connected in series
lamp contact
(a) Are the dry cells and the bulb really connected in series? Briefly explain your answer and draw a
circuit diagram to support your answer.
metal spring
The diagram below shows a light bulb connected in series with an ammeter.
(b) Draw a circuit diagram for the circuit above.
(a) Draw lines on the above diagram to show how you would use the voltmeter to measure the voltage
across the bulb. Use ‘+' and '-' signs to show the positive and negative terminals of the voltmeter.
(c) What happens to the voltmeter and ammeter readings if one more light bulb is connected in parallel
across the original bulb? (increase, decrease or remains unchanged)
Voltmeter reading:
Ammeter reading:
(d) What happens to the voltmeter and ammeter readings if the circuit is connected across two cells?
Voltmeter reading:
Ammeter reading:
A light bulb is connected to a battery as shown. The voltage of the battery is 1.5 V and the current
flowing through the light bulb is 0.05 A.
Later, Kate and Jenny decided to add a switch, an ammeter and a voltmeter in the circuit for
measurement. Their circuit diagrams are shown below respectively.
Kate's diagram
Jenny's diagram
(a) After the switches are closed, what will be the ammeter readings recorded by Kate and Jenny
respectively?
(b) After the switches are opened, what will be the voltmeter readings recorded by Kate and Jenny
respectively?
10. (a) To test for the presence of water, we should handle dry cobalt chloride papers with a pair of forceps
instead of hands. Why?
(c) To keep cobalt chloride paper dry, where should we put it?
(b) If dry cobalt chloride paper is exposed in air for a long time, its colour changes. Name the
substance that causes this colour change.
End of paper
Secondary 2
Instructions:
Belilios Public School
Half-yearly Examination, 2015-2016
Integrated Science
Marking Scheme
There are three sections in this paper.
1. Section A (Multiple-choice questions) carries 18 marks.
2. Section B (Fill in the blanks) carries 12 marks.
3. Section C (Structured questions) carries 70 marks.
4. Answer ALL questions in this paper. Write your answers in the spaces provided in the
Question-Answer Book.
Time allowed: 1 hour
Maximum Marks: 100
Section A: Multiple-choice questions
Question number
Question number
Section B: Fill in the blanks
4. We can use iodine solution to test for starch.
10. The electric current in a metal wire is a flow of free electrons.
11. We can use an ammeter to measure the size of electric current.
1. Oxygen can relight a glowing splint and cause a burning splint to burn more brightly.
2. Carbon dioxide turns red hydrogencarbonate indicator yellow.
Since fuel, oxygen and high temperature are the three conditions needed for burning; we can put out
a fire by removing any one of these conditions.
12. Voltage is the electrical push' that makes free electrons flow in a circuit.
5. Green plants can produce their own food and provide energy for animals. They are called producers
in the food chain.
6. When we breathe in, we take in oxygen from the air for respiration.
7. In the daytime, green plants carry out both respiration and photosynthesis.
8. A closed circuit is a complete circuit without gap that allows electricity to flow through it.
9. Materials that do not allow electricity to flow through are called electrical insulators.
Section C: Structured questions
1. Read the following article and answer the questions that follow.
Inhaling excess oxygen blinds premature babies
A few premature babies had inhaled excess oxygen during their stay at hospital. It is suspected that they
were poisoned by excess oxygen. They became blind because their retinas had been deteriorated. Their
parents now accuse the hospital of negligence and demand compensation.
According to the article, why did the premature babies become blind?
What is the percentage of oxygen in air?
Does breathed air contain oxygen? How can you confirm your answer?
(a) They inhaled excess oxygen which caused their retinas to deteriorate so they became blind. (2m)
Read the following article and answer the questions that follow.
What kind of energy can we get from the burning process for keeping warm?
Collect breathed air by displacement of water. If a candle can burn in a gas jar containing breathed air
for a while, this shows that breathed air contains oxygen.
Nose, bronchus, air sacs, trachea
It has become extremely cold recently. A man, who was believed to have burnt charcoal or wood to set
a fire for keeping warm, died of inhaling excess carbon monoxide yesterday. Carbon monoxide is
known to be able to lower the oxygen-carrying ability of blood, causing a person to die due to a lack of
Arrange the words below to show the route of carbon monoxide entering the human body.
(a) Heat mergy
Nose Trachea → Bronchus Air sacs
The diagram below shows five test tubes containing hydrogencarbonate indicator solution originally
red in colour. The green leaves have been destarched before they are placed under light for some time.
aluminium foil
grasshopper
For the leaf in (3).
State the results of the experiment.
Colour of the
Carbon dioxide content
Boiling tube hydrogencarbonate indicator (increase/no change/
hydrogencarbonate indicator
(b) If the leaves in (1) and (3) are taken for an iodine test, what will be the colour changes?
For the leaf in (1).
What is the function of boiling tube (5)?
State one precaution of this experiment.
grasshopper
Section A: Multiple-choice Questions (18 marks)
Write your answers in the spaces provided in the Question-Answer Book.
Air consists of about 78% of
A. nitrogen.
B. carbon dioxide.
water vapour.
How does the entry of a group of students affect the composition of air in a hall?
Carbon Dioxide Water vapour
B. Increases Increases
C. Decreases Decreases
D. Decreases Increases
Carbon dioxide
C. Carbon dioxide
Water vapour
Burning can produce
(1) light energy.
(2) heat energy.
(4) carbon dioxide.
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?
A. (1) and (2) only
B. (2) and (4) only
Water vapour
Carbon dioxide
(1), (2) and (4) only
(1), (2), (3) and (4)
Variegated leaf can be used to show that
A. carbon dioxide is needed for photosynthesis.
B. water is needed for photosynthesis.
C. chlorophyll is needed for photosynthesis.
D. oxygen is needed for photosynthesis.
Boiling tube
No colour changes, the solution remains brown.
The colour changes from brown to blue black.
It acts as a control to show that the colour change of hydrogencarbonate indicator is due to the
activities of living organisms in the test tubes.
Colour of the hydrogencarbonate
indicator solution
We should not put too much hydrogencarbonate indicator solution else the change in colour may not
be obvious.
The diagram below illustrates an air sac inside the lung:
blood low in oxygen
Why do we need oxygen?
Carbon dioxide content
(increase/no change/ decrease)
oxygen carbon dioxide
Explain why there is carbon dioxide inside our blood.
blood rich in oxygen
red blood cell
blood vessel
Carbon dioxide is given out during respiration and it is dissolved in blood. (2m)
Oxygen is used during respiration to provide energy for our body activities. (2m)
(a) The government has put some warning signs on the packets of cigarettes:
NICOTINE: 1.0 mg
SMOKING HARMS
YOUR CHILDREN
HKSAR GOVERNMENT HEALTH WARNING
20 CLASS CIGARETTES
(b) State THREE harmful substances that enter a person's body when he smokes.
吸煙禍及子女
特區政府忠告市民
(i) Refer to the warning sign on the cigarette package, explain why 'smoking harms your children'.
(c) Which substance in cigarettes is addictive?
(ii) How the foetus, a young human being before birth, is affected by its smoking mother.
(d) Which substance in cigarettes lowers the amount of oxygen carried by blood?
(b) Tar, nicotine and carbon monoxide
(d) Carbon monoxide
The bulb x lights with normal brightness when a cell is connected across it.
(i) Children are exposed to passive smoking. They also inhale some harmful substances from the
smoke of cigarettes.
If a mother smokes during her pregnancy, the harmful substances in the cigarettes may reach the
foetus, affecting its development.
The circuit below shows one cell, two switches A and B and two identical bulbs X and Y.
Complete the following table and describe whether, on each situation, the bulb will be brighter than
normal, normal, dimmer than normal or out.
normal brightness
7. After studying an electric torch carefully, Mary drew a diagram showing its internal structure (Fig. a).
plastic casing
lamp filament
metal switch contacts
(b) Why is the metal spring necessary?
slide switch
C-sized cells connected in series
lamp contact
(a) Are the dry cells and the bulb really connected in series? Briefly explain your answer and draw a
circuit diagram to support your answer.
metal spring
Yes, they are connected in series. The circuit diagram is shown below. There is only one path for the
current to flow through.
3 V (2 C-sized cells) I
(b) The metal spring can ensure a good contact between the bulb and the two cells. (1m)
The diagram below shows a light bulb connected in series with an ammeter.
(b) Draw a circuit diagram for the circuit above.
Voltmeter reading:
Ammeter reading:
(a) Draw lines on the above diagram to show how you would use the voltmeter to measure the voltage
across the bulb. Use '+' and '-' signs to show the positive and negative terminals of the voltmeter.
(c) What happens to the voltmeter and ammeter readings if one more light bulb is connected in parallel
across the original bulb? (increase, decrease or remains unchanged)
(d) What happens to the voltmeter and ammeter readings if the circuit is connected across two cells?
Voltmeter reading:
Ammeter reading:
no change, increase
(d) increase, increase
A light bulb is connected to a battery as shown. The voltage of the battery is 1.5 V and the current
flowing through the light bulb is 0.05 A.
Later, Kate and Jenny decided to add a switch, an ammeter and a voltmeter in the circuit for
measurement. Their circuit diagrams are shown below respectively.
Kate's diagram
Jenny's diagram
(a) After the switches are closed, what will be the ammeter readings recorded by Kate and Jenny
respectively?
(b) After the switches are opened, what will be the voltmeter readings recorded by Kate and Jenny
respectively?
(a) The ammeter reading of both Kate and Jenny will be 0.05 A.
The voltmeter reading of Kate will be 1.5 V.
The voltmeter reading of Jenny will be 0 V.
10. (a) To test for the presence of water, we should handle dry cobalt chloride papers with a pair of forceps
instead of hands. Why?
(b) If dry cobalt chloride paper is exposed in air for a long time, its colour changes. Name the
substance that causes this colour change.
(c) To keep cobalt chloride paper dry, where should we put it?
This prevents the moisture on hands from turning the cobalt chloride papers from blue to pink,
interfering the experimental results.
The water vapour in air.
In a desiccator
End of paper
Which of the following statements about respiration are correct?
(1) Food is necessary for respiration to take place.
(2) Respiration is a complex process involving many chemical reactions.
(3) Respiration is also known as breathing.
A. (1), (2) only
(1), (3) only
(2), (3) only
(1), (2) and (3)
Which of the following is NOT a pollutant in the atmosphere?
A. Carbon monoxide
B. Nitrogen oxides
When we start a barbecue fire, we usually fan the fire,
A. this provides more oxygen to the fire for burning.
this lowers the temperature of the barbecue fire and thus lower the risk of an accident.
this increases the temperature of the barbecue fire and so the fire can be stronger.
this brings more fuel to the fire for burning.
9. The bulbs and cells in the circuits below are identical. In which of the following cases is the bulb the
10. Look at the circuit below.
If the ammeter reading is 0.5 A, then the electric currents at points 1 and 2 are:
greater than 0.5 A
less than 0.5 A
B. Electrical energy
D. Energy value
11. Which of the following combinations is NOT correct?
Physical quantity
Electric current
greater than 0.5 A
less than 0.5 A
kilocalories (kcal)
12. Look at the circuit below. The two dry cells are identical and each has a voltage of 1.5 V.
A voltmeter is connected across bulb A and the reading is 2 V. What will be the reading if it is
connected across bulb B?
13. Which of the following would happen if there was no electricity at home?
(1) Communication would become more difficult.
(2) More energy would be used.
(3) Cooking would become much easier.
A. (1) only
(1) and (2) only
(1) and (3) only
(1), (2) and (3)
14. Study the following circuit:
What happens to the ammeter reading when the switch is closed?
A. The ammeter reading will increase.
B. The ammeter reading will decrease, but will not become zero.
C. The ammeter reading will remain unchanged.
The ammeter reading will become zero.
15. Which of the following descriptions about air is correct?
A. It can change lime water milky.
B. It contains many different gases.
Breathed air contains no oxygen.
It is white in colour.
16. Refer to the diagram below:
During the experiment, it is observed that the coloured liquid index gradually moves towards the bell
jar. Which of the following is the correct explanation for this?
17. When will plants take in oxygen?
In the daytime
C. In the daytime and at night
The mouse uses up oxygen.
Soda lime absorbs carbon dioxide released by the mouse.
Soda lime absorbs water vapour released by the mouse.
Soda lime absorbs oxygen released by the mouse.
18. Which of the following is NOT a method to reduce the greenhouse effect?
(1) Burning less fossil fuels
(2) Cutting down more trees
(3) Planting more trees
(4) Using private cars instead of public transport
A. (1), (2) only
B. (1), (4) only
C. (2), (3) only
(2), (4) only
End of Section A
Go on to Question-Answer Book for questions in Section B and C
Secondary 2
Instructions:
Belilios Public School
Half-yearly Examination, 2015-2016
Integrated Science
QUESTION-ANSWER BOOK
There are three sections in this paper.
1. Section A (Multiple-choice questions) carries 18 marks.
2. Section B (Fill in the blanks) carries 12 marks.
3. Section C (Structured questions) carries 70 marks.
4. Answer ALL questions in this paper. Write your answers in the spaces provided in the
Question-Answer Book.
Time allowed: 1 hour
Maximum Marks: 100
Section A: Multiple-choice questions
Question number
Question number 10
Section B: Fill in the blanks
1. Oxygen can relight a
2. Carbon dioxide turns red
4. We can use iodine solution to test for
6. When we breathe in, we take in
11. We can use an
we can put out a fire by removing any one of these conditions.
7. In the daytime, green plants carry out both respiration and
in the food chain.
10. The electric current in a metal wire is a flow of
9. Materials that do not allow electricity to flow through are called
5. Green plants can produce their own food and provide energy for animals. They are called
splint and cause a burning splint to burn more brightly.
oxygen and high temperature are the three conditions needed for burning;
circuit is a complete circuit without gap that allows electricity to flow through it.
from the air for respiration.
to measure the size of electric current.
is the 'electrical push' that makes free electrons flow in a circuit.
Section C: Structured questions
1. Read the following article and answer the questions that follow.
(b) What is the percentage of oxygen in air?
Inhaling excess oxygen blinds premature babies
A few premature babies had inhaled excess oxygen during their stay at hospital. It is suspected that they
were poisoned by excess oxygen. They became blind because their retinas had been deteriorated. Their
parents now accuse the hospital of negligence and demand compensation.
According to the article, why did the premature babies become blind?
Does breathed air contain oxygen? How can you confirm your answer?
Read the following article and answer the questions that follow.
What kind of energy can we get from the burning process for keeping warm?
It has become extremely cold recently. A man, who was believed to have burnt charcoal or wood to set
a fire for keeping warm, died of inhaling excess carbon monoxide yesterday. Carbon monoxide is
known to be able to lower the oxygen-carrying ability of blood, causing a person to die due to a lack of
Arrange the words below to show the route of carbon monoxide entering the human body.
Nose, bronchus, air sacs, trachea