21–22/ F2/ 1st Term Exam /Integrated Science /P.1
TWGHs Wong Fut Nam College
First Term Examination
2021 – 22
Form 2 Integrated Science
Setter: Man Kin Pong
Date: 28/1/2022 (FRI)
Total marks: 70
Time: 1:25 - 2:25 p.m.
Total no. of pages: 18
Time allowed: 1 hour
Instructions:
1. Answer ALL the questions.
2. For section A and B, mark your answers on the MC answer sheet provided.
For section C, write down your answers in the spaces provided on the Answer
sheets. (P. 15–18).
3. Marks Allocation:
Section A
M.C. – 20 marks
Section B
True or False – 5 marks
Section C
Questions – 45 marks
4. The MC answer sheet and the question-answer sheets (P.15–18) will be collected
at the end of the examination.
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21–22/ F2/ 1st Term Exam /Integrated Science /P.2
Section A: Multiple Choices (20 Marks)
1.
Nitrogen gas is used to fill some food packages. Why can this keep the food fresh?
A.
B.
C.
D.
2.
Which of the following statements about exhaled and inhaled air is correct?
A.
B.
C.
D.
3.
Micro-organisms cannot carry out respiration in nitrogen.
Nitrogen gas can be used to store living cells.
It is safer to use nitrogen gas than air.
Nitrogen gas does not burn or support burning.
Exhaled air contains more carbon dioxide than inhaled air.
Exhaled air contains less water vapour than inhaled air.
Exhaled air contains more nitrogen than inhaled air.
The temperature of exhaled air is the same as that of inhaled air.
Ashley lit three candles and put them in three gas jars containing different gases as shown
below. The three candles are the same.
Jar 1: air
Jar 2: oxygen
Jar 3: nitrogen
Which of the following correctly shows the time needed for the candles in the jars to go out in
descending order?
A.
B.
C.
D.
Jar 3 > Jar 2 > Jar 1
Jar 3 > Jar 1 > Jar 2
Jar 2 > Jar 3 > Jar 1
Jar 2 > Jar 1 > Jar 3
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21–22/ F2/ 1st Term Exam /Integrated Science /P.3
4.
The Air Quality Health Index (AQHI) is reported on a scale of 1 to 10 and 10+ in ascending
order of health risk.
(Source: Environmental Protection Department, HKSAR Government)
Which of the following about the AQHI is INCORRECT?
A. The AQHI tells us about the air quality.
B. During the days with high AQHI, people with heart or respiratory diseases should reduce
physical and outdoor activities.
C. Motor vehicles are one of the sources of the air pollutants included in calculating the
AQHI.
D. The AQHI applies to urban areas in Hong Kong only.
5.
Which of the following is the most appropriate description of respiration?
A. Release of food in living cells
B. Consumption of food in living cells
C. Release of energy from food in living cells
D. Storage of energy in food in living cells
6.
Which of the following descriptions about the difference between respiration and burning is
correct?
A. The release of energy is slower in respiration.
B. Burning is a more complicated process.
C. With the same amount of food, more energy is released in burning.
D. Burning leads to an increase in temperature but respiration does not.
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21–22/ F2/ 1st Term Exam /Integrated Science /P.4
7.
Why is the Bunsen burner turned off when the leaf is heated in alcohol during the test for
starch?
A.
B.
C.
D.
8.
We can save the amount of town gas used.
Alcohol is flammable.
The leaf may break if water keeps boiling.
The water bath is hot enough.
A potted plant with variegated leaves is destarched and then put under sunlight for an hour.
After these, a leaf is removed from the plant and test for the presence of starch.
sunlight
non-green part of the
variegated leaf
green part of the
variegated leaf
Which of the following shows the correct result?
A.
B.
C.
the whole leaf has starch.
9.
green part of the leaf has
starch only.
D.
non-green part of the leaf
has only.
the whole leaf does not
haves starch.
What are the possible results of global warming?
(1) There will be more typhoons in summer.
(2) The sea level rises due to melting of ice at the Poles.
(3) Air temperature increases.
A.
B.
C.
D.
(1) and (2) only
(1) and (3) only
(2) and (3) only
(1), (2) and (3)
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21–22/ F2/ 1st Term Exam /Integrated Science /P.5
10. Which of the following are harmful substances present in cigarette smoke?
(1) Carbon monoxide
(2) Tar
(3) Nicotine
A. (1) and (2) only
B. (1) and (3) only
C (2) and (3) only
D (1), (2) and (3)
11. Which of the following human activities lead(s) to an excessive greenhouse effect in the
atmosphere?
(1) Cutting down trees
(2) Using solar energy to generate electricity
(3) Burning coal and oil
A. (1) only
B. (1) and (2) only
C. (1) and (3) only
D. (2) and (3) only
12. Which of the following diagram shows the net exchange of gases of a green plant in dark?
A.
B.
oxygen
carbon
dioxide
C.
oxygen
carbon
dioxide
oxygen
carbon
dioxide
D.
oxygen
carbon
dioxide
13. Which of the following statements about resistance is/are correct?
(1) Resistance is measured in amperes.
(2) Resistance is a measure of the opposition of a material to the flow of current.
(3) The resistance of a wire depends on the material used.
A.
B.
C.
D.
(2) only
(1) and (2) only
(2) and (3) only
(1), (2) and (3)
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21–22/ F2/ 1st Term Exam /Integrated Science /P.6
14. A game is set up with a simple circuit.
copper wire
steel loop
bulb
dry cell
Why does the bulb light up when the steel loop touches the copper wire?
A. The circuit is completed.
B. The circuit is broken.
C. The dry cells are switched on.
D. The voltage of the circuit is decreased.
15. Three ammeters are connected in series with a dry cell and two light bulbs, as shown below.
Which of the following statements is/are correct?
(1) All ammeters show the same reading.
(2) A3 has the highest reading.
(3) The reading of A2 is zero.
A.
B.
C.
D.
(1) only
(2) only
(3) only
(2) and (3) only
16. Three resistors X, Y and Z are connected across a 1.5 V dry cell.
The following table shows the resulting currents against the voltages applied.
Resistor
X
Y
Z
Voltage
1.5 V
1.5 V
1.5 V
Current
1.5 A
1.0 A
0.5 A
Which one has the largest resistance?
A. Resistor X
B. Resistor Y
C. Resistor Z
D. The same
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21–22/ F2/ 1st Term Exam /Integrated Science /P.7
17. What is the reading shown by the following ammeter?
A.
B.
C.
D.
36 mA
336 mA
360 mA
3.6 A
18. The following diagrams show a flashlight battery and a bulb connected by wires to various
substances.
Which of the bulbs will light up?
A. 1 and 2 only
B. 2 and 3 only
C. 3 and 4 only
D. 1, 2 and 3 only
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21–22/ F2/ 1st Term Exam /Integrated Science /P.8
19. In which of the circuits the two bulbs are connected in series?
A.
B.
C.
D.
20. The diagram below shows a parallel circuit. The three bulbs are identical.
P
X
2
Y
4
Z
6
Which of the following statements about the circuit is/are correct?
A.
B.
C.
D.
Bulb Z is brighter than bulbs X and Y.
The current passing through bulb X is smaller than that passing through bulb Y.
If bulb X is broken, the brightness of bulbs Y and Z will not change.
If bulbs X and Z are interchanged, the current passing through point P in the circuit
decreases.
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21–22/ F2/ 1st Term Exam /Integrated Science /P.9
Section B: True or False (5 Marks)
Decide whether the following statements are True or False, and mark “A” or “B” respectively on
the MC answer sheet provided. Each question carries 1 mark.
1.
Air is a mixture of three gases, namely oxygen, carbon dioxide and nitrogen.
2.
We can use soda lime to absorb carbon dioxide.
3.
A battery stores electrical energy.
4.
An ammeter may burn out when connected directly to a dry cell.
5.
Two light bulbs are brighter when connected in parallel to a battery than in series.
Section C: Questions (45 Marks)
1.
In an experiment, Marus pours gas X over a candle flame as shown. He observes that the
candle flame burns more brightly.
gas X
conical flask
beaker
burning candle
(a) What is gas X? And what is the its percentage in air?
(2 marks)
(b) Gas X is consumed inside the cells of a rabbit to release energy from food. Name the
process and write down the energy conversion in the process that the rabbit is keep
jumping.
(3 marks)
(c) Burning fossil fuels also consumed Gas X. Cody argues with Marcus that the decrease
of the amount of Gas X in the atmosphere leads to “Ocean Acidification”.
Do you agree? Explain your answer.
(2 marks)
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21–22/ F2/ 1st Term Exam /Integrated Science /P.10
2.
Jeremy wants to investigate the necessary conditions for photosynthesis. He destarches a
potted plant and sets up as shown below. Then the potted plant is put under sunlight for an
hour.
(a)
Write the word equation of photosynthesis.
(2 marks)
(b)
Before the experiment, how can Jeremy destarch the plant?
(1 mark)
(c)
solution X
leaf
After leaving the plant under sunlight for an hour, leaves A, B and C are removed to test
for the presence of starch.
(i)
What is solution X?
State the expected colour change of solution X if there is starch in the leaves.
(2 marks)
(ii)
Which leaves A, B, C show(s) the presence of starch in the test.
(1 mark)
(iii) Comparing the results of leaves A and C, what conclusion can be drawn.
(1 mark)
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21–22/ F2/ 1st Term Exam /Integrated Science /P.11
3.
(a) The following test-tubes are all put under sunlight for a few hours.
(i)
Complete the table to show the colour change of the hydrogencarbonate indicator.
(3 marks)
(ii) Explain the colour of the hydrogencarbonate indicator changes in test-tube B.
(2 marks)
(b) The diagram below shows an industrial city in China.
(i)
Name TWO air pollutants may be emitted from the factories.
(2 marks)
(ii) Name TWO health problems caused by the air pollutants mentioned in (a).
(2 marks)
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21–22/ F2/ 1st Term Exam /Integrated Science /P.12
4.
Figure 4.1 shows the main parts of the human breathing system. Figure 4.2 shows the gas
exchange at structure P in the human breathing system.
blood to body cells
gas X
gas Y
blood from body cells
Figure 4.1
Figure 4.2
(a) Complete the flow chart to show the pathway of exhaled air in the system shown in
when we breathe out.
(4 marks)
(b) (i)
What is structure P?
(1 mark)
(ii) Name gas X and gas Y.
(2 marks)
(iii) Plants also carry out gas exchange. At which structure does the gas exchange in
plants take place?
(1 mark)
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21–22/ F2/ 1st Term Exam /Integrated Science /P.13
5.
Sketch the circuit diagrams for the following circuits.
(a)
ammeter
battery
bulb
(2 marks)
(b)
bulb
cell
switch
resistor
bulb
(3 marks)
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21–22/ F2/ 1st Term Exam /Integrated Science /P.14
6.
Cody measures the current flowing through a bulb with instrument X, as shown below.
instrument X
(a) Name instrument X.
(1 mark)
(b) State which terminal (red or black) of instrument X is the positive terminal.
(1 mark)
(c) Cody wants to change the circuit, so that the brightness of the bulb can be increased.
(i) What electrical component should she add to the circuit?
(1 mark)
(ii) Draw a circuit diagram to show how she can modify the circuit.
(2 marks)
(d) Now, Mr Man give a challenging task to Cody. She has to use the components listed in
table 6.1 and design a circuit that meets the following TWO requirements.

Both the bulb and the motor work at a voltage of 4.5 V.

The bulb and the motor are switched on or off at the same time.
Component
1.5 V dry cell
Bulb
Motor
Switch
Connecting wire
Quantity
5
1
1
1
Several
Table 6.1
Draw the circuit diagram of Cody’s design. It is not necessary to use all of the
components listed in table 6.1. (Given: the circuit symbol of motor:  M  )
(4 marks)
END
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