KWUN TONG GOVERNMENT SECONDARY SCHOOL
Yearly Examination 2011-2012
Integrated Science
Class : S.2 ( ) Max. Mark : 100
Name : ______Date : 14-6-2012
Class No.: ______Time : 8:45-9:45
Answer all of the questions on the answer sheet provided.
(A) Multiple Choice (20 marks)
1. Which of the following are the correct colours of the wires in a 3-pin plug?
2. An electrical appliance has the label “110 V, 3 A” on it. Which of the following statements about the appliance is correct?
A. The appliance is not suitable to be used in Hong Kong because its current is too large.
B. The appliance is not suitable to be used in Hong Kong because the operating voltage is different.
C. The label is wrong. It should be 13 A.
D. The operating current is 6 A.
3. Which of the following descriptions about household circuits is incorrect?
A. Fuses are installed in live wire of 3-pin plug.
B. Bulbs in houses are connected in parallel.
C. The ring circuit is a series circuit.
D. The earth wire of 3-pin plug is connected to the ground.
4. The figure below shows a 3-pin plug. What is the use of pin P?
A. Connect to metal case of an electrical appliance. B. Connect to fuse.
C. Prevent short circuit. D. Prevent overloading of circuit.
5. Which of the following circuit diagrams represents the set-up below?
A. / / B. /C. / / D. /
6. An electric iron is going to be connected to the mains socket. ‘E’, ‘L’ and ‘N’ represent the earth wire, the live wire and the neutral wire respectively. Which of the following circuits connects the electric iron safely to the mains socket?
A /B /
C /
D /
7. If someone gets an electric shock from the mains at home, which of the following should be done?
(1) Switch the power off at the mains if it is safe to do so.
(2) Remove any cables in contact with the casualty (傷者) using insulating objects such as wooden rod.
(3) Dial 999 to call for help.
A. (1) only B. (1) and (2) only C. (2) and (3) only D. (1), (2) and (3)
8. Which of the following hazard warning labels can be found on reagent bottles containing concentrated hydrochloric acid?
A./ B.
/ C.
/ D.
.
9. Which of the following substances can be used as an indicator to distinguish acidic and alkaline solutions?
(1) A substance that reacts with acidic and alkaline solutions.
(2) A substance that shows different colours in acidic and alkaline solutions.
(3) A substance that is soluble in acidic and alkaline solutions.
A. (1) only B. (2) only C. (3) only D. (1), (2) and (3)
10. Which of the following substances can be used to distinguish acidic and alkaline solutions?
A. Lemon juice B. Universal indicator C. Lime water D. Global indicator
11. Which of the following substances has the highest pH value?
A. Ammonia solution B. Saliva C. Distilled water D. Sodium hydroxide solution
12. Which of the following should NOT be cooked in a metal pot?
A. Egg B. Potato C. Vinegar D. Pork
13. It is normal for rainwater to have a pH value of about 5.6. Which of the following is/are the reason(s) for it?
(1) Rainwater of pH 5.6 is neutral.
(2) Carbon dioxide dissolved in the rainwater makes the rainwater slightly acidic.
(3) Nitrogen dissolved in the rainwater makes the rainwater slightly acidic.
A. (1) only B. (2) only C. (2) and (3) only D. (1), (2) and (3)
14. Concentrated sodium hydroxide solution
(1) is acidic. (2) is highly dangerous. (3) can be used as a preservative.
A. (2) only B. (1) and (2) only C. (1) and (3) only D. (2) and (3) only
15. Why does an egg lose its shell after putting into vinegar for a few days?
A. The shell contains calcium carbonate that is broken down by the vinegar.
B. The shell is still there but it becomes transparent.
C. The shell is absorbed by egg white.
D. The shell is affected by acid and went off.
16. Which of the following descriptions about eyes is correct?
A. Eyes can only move upwards and downwards.
B. Eyes can only move left and right.
C. Eyes have a tough outer layer called sclera.
D. Lens is formed by nerve structure, being the most important part of eyes that receive stimuli of light.
17. Humans interpret seeing, hearing, tasting and smelling in the
A. brain. B. hearts. C. receptors. D. skin.
18. When a person sees something, what carries the message from the eyes to the brain?
A. blood vessels B. bones C. muscles D. nerves
19. What measures has the Hong Kong government taken to control noise pollution?
(1) Limit the time for noisy construction works to daytime on weekdays.
(2) Impose penalties on people who disturb neighbours by making noise during particular periods of time.
(3) Build noise barriers along busy roads and railways.
A. (1) and (2) only B. (1) and (3) only C. (2) and (3) only D. (1), (2) and (3)
20. Which of the following is NOT detected by taste receptors?
A. Sweetness B. Bitterness C. Spiciness D. Sourness
(B) True or False Statements (10 marks)
Write 'T' for a true statement and 'F' for a false one.
1. Short circuit will lead to an excessive current passing through the circuit. This excessive current will melt the fuse.
2. Although electrical appliances without connecting earth wire can work, it is not safe.
3. Repairing electrical appliances must be carried out by qualified electricians.
4. Hydrogencarbonate indicator can be used to test acids and alkalis.
5. Drain cleaners are highly corrosive.
6. The lower the pH value is, the less acidic an acid is.
7. Neutralization is the process of diluting acids or alkalis with water.
8. Wearing glasses with suitable degrees is the only way to correct vision.
9. Noise can distract people easily which increases the risk of having industrial accidents.
10. Skin only has the ability to detect touch.
(C) Matching (10 marks)
Column A / Column B1. short circuit / A. To clean the toilet bowls
2. circuit breaker / B. Current flow will be very large
3. natural indicator / C. Chemical name of table salt
4. sodium chloride
5. diluting concentrated acids / D. To magnify the vibrations of the eardrum and pass them to the inner ear
6. hydrochloric acid / E. Safety setup which can cut off electricity
7. red light / F. detected by nose
8. scent of flowers / G. A lot of heat will be given out
9. cornea / H. To help focus light onto the retina
10. ear bones / I. Examples include red cabbage and red rose
J. detected by eyes
(D) Fill in the blanks (20 marks)
1. By using circuit (a)______, we can draw circuit diagrams to show how the circuit components are connected.
2. In a series circuit, current flows in (b)______path.
3. In a (c) ______circuit, an open circuit in a branch does not affect other branches.
4. Incandescent bulbs make use of the (d) ______effect of current to give out light.
5. The circuit breakers are usually put together in the (e) ______.
6. Electricity is supplied to our homes through the (f) ______wire and the (g) ______wire.
7. We should use fuses with suitable fuse (h) ______.
8. (i)______is a mixture of pigments extracted from certain kinds of lichens.
9. Soft drink turns blue litmus solution (j) ______.
10. Dilute acids react with calcium carbonate to produce (k) ______.
11. The burning of (l)______is the main cause of acid rain.
12. (m) ______can relieve stomach ache caused by excess acids by neutralizing the excess acids in the stomach.
13. Farmers usually add (n) ______to acidic soil to regulate soil pH.
14. (o) ______is the most commonly used acid for preserving food.
15. When we look at (p) ______objects, the lens becomes thicker.
16. Cataract is an eye defect in which the (q) ______becomes cloudy.
17. Humans can hear sounds of (r) ______from about 20 Hz to 20 000 Hz.
18. When we breathe in, the chemicals enter our nose and dissolve in the (s) ______in the nasal cavity. The dissolved chemicals stimulate the (t) ______to send messages to the brain.
(E) Short Questions (40 marks)
1. In the circuit below, apparatus X can be used to measure the current in a circuit.
(a) What is apparatus X? (1 mark)
(b) Draw a circuit diagram for the above circuit. (3 marks)
(c) What happens to apparatus X if its connection is reversed? (2 marks)
(d) How are apparatus X and the bulbs connected? (1 mark)
(e) If we take away bulb P, will bulb Q still light up? Explain briefly. (2 marks)
(f) According your answer in (e), should we use this type of connection in our homes? Explain briefly. (2 marks) [Total: 11 marks]
2. (a) What kind of plug do all electrical appliances in Hong Kong need to equip with? (1 mark)
(b) The wire in the diagram below is worn. What is the potential danger if we use this appliance?
(2 marks)
[Total: 3 marks]
3. Ron is diluting a concentrated acid as shown below. Is he correct? Explain briefly. (3 marks)
4. Betty carried out the experiment below to study the reaction between dilute hydrochloric acid and zinc foil. When the zinc foil was put into the acid, gas bubbles were given out from the zinc foil.
(a) What was the gas given out from the zinc foil? (1 mark)
(b) How can Betty test the gas in (a)? (2 marks)
(c) What happened to the zinc foil during the experiment? (1 mark)
[Total: 4 marks]
5. Read the article about mosquitoes below and answer the questions.
MosquitoesMosquitoes are small and they move quite fast. It is hard to spot a mosquito while you hear its buzz. The buzz is produced by the mosquito wings which vibrate rapidly at 250–1000 beats per second. Male and female mosquitoes of the same species beat their wings at different frequencies so that male mosquitoes can find female mosquitoes for mating more easily.
(a) Why is it hard to spot a mosquito? (2 marks)
(b) With reference to the frequency of vibration of mosquitoes’ wings, explain why humans can hear the buzz produced by the vibrating wings. (1 mark)
(c) Which sense do male mosquitoes depend on to find female mosquitoes? (1 mark)
[Total: 4 marks]
6. The following test of touch contains two kinds of sand paper with different coarseness. A student uses the following method to test the sensitivity of different position of skin.
(i) Student being tested first has his eyes wrapped.
(ii) Another student randomly uses the same sandpaper or two different kinds of sandpaper to rub different positions of skin.
(iii) Note down if the student can distinguish if the sandpaper used to rub his skin is the same.
Results:
(a) Why does fingertip distinguish the best?(3 marks)
(b) Some say that the skin is more sensitive if the skin is thinner. Do you agree? Explain. (2 marks)
(c) Write down the other senses of skin. (3 marks)
[Total : 8 marks]
7. (a) Write down the name of the lens shown below. (1 mark)
(i) (ii)
(b) The following figure shows a short-sighted eye. Draw a ray diagram to show how to use appropriate lens to correct short sight. (2 marks)
(c) State TWO causes of short sight. (2 marks)
(d) Describe what would happen if optic nerve is damaged in an accident. (2 marks)
[Total : 7 marks]
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