Kiribati National Certificate
SCIENCE
2012
QUESTION and ANSWER BOOKLET
Time allowed: 3 hours (plus 10 minutes reading time)
INSTRUCTIONS
1. Write your Code Number in the spaces provided above and on the last page of this booklet. 2. This examination is in TWO COMPULSORY Sections.
a. SECTION A MULTIPLE CHOICE (30 Marks)
b. SECTION B STRUCTURED QUESTIONS (70 Marks)
3. For Multiple Choice Questions, write the letter of your choice on the Multiple Choice Answer Sheet provided on page 2 of this Booklet.
4. Write the number of the extra papers used in the box at the top left hand corner of page 26. Write NIL if you did not use any extra papers.
5. Check that this Booklet contains pages 2 - 26 in the correct order.
ANSWER SHEET FOR SECTION A MULTIPLE CHOICE
This section is compulsory. Attempt ALL Questions by writing the LETTER of your choice in CAPITAL LETTERS in the box provided below. If you decide to change your answer, just cross out the first answer and write the second choice in the space outside the box as shown: Example
B DO NOT CHANGE YOUR ANSWER MORE THAN 3 TIMES
1. 11. 21.
2. 12. 22.
3. 13. 23.
4. 14. 24.
5. 15. 25.
6. 16. 26.
7. 17. 27.
8. 18. 28.
9. 19. 29.
10. 20. 30.
SECTION A MULTIPLE CHOICE 30 MARKS
This Section contains 30 Multiple Choice Questions picked from the three main topics as follows: Biology: 12 marks
Physics: 9 marks Chemistry: 9 marks
You must answer ALL questions, by writing the LETTER of your choice in the box on the answer sheet provided on PAGE 1 of this booklet.
1. A biological cell is defined as
A) a tiny structure of all living and non living organisms. B) a smallest unit of all living organisms.
C) a smallest unit consisting of protons, neutrons and electrons. D) a smallest particle made up of a nucleus and cytoplasm.
2. The movement of water molecules from a high concentration to a low concentration across a semi-permeable membrane is
A) meiosis. B) transpiration. C) osmosis. D) evaporation.
3. A term used to describe a symbiotic relationship between a coral polyp and zooxanthallae is A) mutualism.
The graph below shows a growing pattern of a population. Use it to answer Question 4.
4. The growth pattern seen in the graph is drawn from a population of A) human
B) coral reef C) bacteria D) insects
The table below is for Question 5 and 6
Parents Genotype Phenotype
A Bb Brown hair
B BB Black hair
Parents A and B are of opposite gender.
5. If parent A and B were crossed, the probability of a brown haired offspring produced is, A) 0
B) 0.25 C) 0.5 D) 1
6. If parent A is crossed with another heterozygous brown hair parent, the probability of a white haired (non-coloured hair) offspring is
7. A correct reason why HIV is considered the most dangerous virus is because A) it cannot be cured or slowed down by any medicine.
B) it replicates inside the white blood cells and destroy our immune system. C) it fights against medicines very fast.
D) it destroy the muscle tissue to stop the body from growing in healthy condition.
The diagram below shows some four cell organelles. Use it to answer Question 8
8. Which from the above cell organelles is the main site of photosynthesis? A) W
B) X C) Y D) Z
9. The reason why fungi is classified as a unicellular microorganism is A) it has a visible nuclei under the light microscope.
The graph shown below shows the amount of antibody produced in the body when a mild-form of pathogen is injected into the body. Use the graph below to answer Question 10
10. The correct interpretation of the graph is
A) the amount of antibody produced is increasing to accommodate the number of pathogen injected.
B) the body is very sensitive to any pathogen because of the sensors producing antibodies.
C) the body defense mechanism detect the presence of the pathogen and start to produce the antibodies.
D) the antibody is the destroyer of any pathogen that enters the body.
The diagram below is for Question 11.
11.Which from the following is a correct label for W, X, Y and Z?
W X Y Z
A) Polyp colony Mature polyp Sexual reproduction Planula larva B) Sexual reproduction Planula larva Mature polyp Polyp colony C) Mature polyp Polyp colony Sexual reproduction Planula larva D) Polyp colony Sexual reproduction Mature polyp Planula larva
12.An antibody is defined as
A) a chemical that interacts with the white blood cells in order to destroy the immune system.
B) a substance that carry medicine to the damaged tissue for treatment
C) a protein found in blood fluid and are used by the immune system to identify foreign substances
D) a protein present in the bone marrow that helps in the clotting of blood when tissue was accidently cut.
The graph below shows a motion of a vehicle. Use it to answer Question 13.
13.The correct term to describe the motion shown in the graph is A) uniform motion.
B) accelerating.
C) stationery – not moving. D) slowing down.
speed
14.The term terminal velocity can be defined as
A) a constant velocity attained by an object moving in a free fall motion. B) when an object accelerates constantly in one direction.
C) a velocity reached when an airplane start to slow down at the airport terminal. D) when an object accelerates constantly in different directions.
15.The diagram shows the wheelbarrow filled with a load of 500N. The amount of effort force needed to lift the load is
A) 10N. B) 50N. C) 100N. D) 150N.
16.The voltage of 15V supplies a current of 3A to a lamp. The power of the lamp is A) 5W.
B) 15W. C) 45W. D) 60W.
17.A car battery supplies a current of 200A to a starter motor at a voltage of 10V. What is the resistance of the motor?
18.A sound wave travels in the air at the speed of 330m/s with a wavelength of 0.2m. The frequency of the wave is
A) 16.5Hz. B) 1254Hz. C) 1435Hz. D) 1650Hz.
19.Choose from the following the main difference between light waves and sound waves.
Light wave Sound wave
A) Travels through a medium Travels through vacuum B) Travels through a vacuum Travels through a medium C) Travels as longitudinal waves Travels as transverse wave
D) Travels in one direction Travels in more than one direction
The diagram below shows a longitudinal wave type. Use it to answer Question 20
20.The correct label for structure b is A) expansion.
B) reflection. C) rarefaction. D) diffraction.
21.Which statement best describe a step-down transformer? A) Converts a 240V to 110V
B) Has more turns in the secondary coil than in primary coils C) Produces a higher voltage than the input voltage
22.The symbol for the element that has an electron configuration of 2,8,7 is A) Ne
B) K C) B D) Cl
23.Element X with an atomic number of 6 is an isotope of element Y. If Y has 8 neutrons, what is the mass number of element Y?
A) 8 B) 11 C) 14 D) 16
24.The GENERAL FORMULA for alcohols is A) CnH2n+1OH
B) CnH2n
C) CnH2n+1
D) CnH2nOH
The following diagrams show the structure of three organic compounds. Use them to answer
Question 25 and 26
25.Which structure resembles a Carboxylic Acid? A) B
B) A & C C) A D) C
26.Compound C can be oxidized in air to form a carboxylic acid called A) butanoic acid.
27.The chemical equation shows the reaction of Sodium metal (Na) and water (H2O)
__Na(s) + __H2O(l) __NaOH(aq) + __H2(g)
Choose the correct order of digit that will balance the above reaction. A) 2,2,1,1
B) 2,2,2,1 C) 2,3,2,1 D) 1,1,2,1
28.The reaction between a metal hydroxide and an acid will produce A) salt, water and hydrogen gas.
B) salt, water and carbon dioxide. C) salt, water and Carbon monoxide. D) salt and water only.
29.Lighting the match is an example of a chemical change reaction. The most correct explanation for this is
A) the fire will suddenly dies out in air when left for several minutes. B) heat energy is produced only as the match was struck to the match paper. C) phosphorus in the match will combine with oxygen to form a new compound. D) the smoke is produced during the reaction.
30.Which of the following chemical contribute to the formation of acid rain? A) Nitrogen oxide
SECTION B: STRUCTURED QUESTIONS 70 MARKS This section consists of three parts as follows;
PART I BIOLOGY 30 MARKS PART II PHYSICS 20 MARKS PART III CHEMISTRY 20 MARKS
Answer ALL questions and write all your answers in the SPACES provided in this booklet.
PART I BIOLOGY 30 MARKS
1. The diagrams below show two typical cell structures and their organelles. Use the diagrams to answer the questions that follow.
a) Which cell from the diagram is an animal cell, A or B?
__________________________________ 1mark
b) Label with an X on the diagram, the food vacuole in cell B
1mark
c) Which cell will survive longer in a salty solution? Explain your choice.
Cell:____________
Explanation:_______________________________________________________
2. The transport of important materials in plant for their survival is carried out by two main vessels known as phloem and xylem.
a) Describe the function of the following vessel.
i) Xylem:________________________________________________
______________________________________________________1mark
b) When the hard outer cover of the stem is removed (ring-barking), the plant will become weak and suddenly dies out. Explain this using your knowledge on the transport of materials in plant.
_____________________________________________________________________
______________________________________________________________2marks
3. The diagram below shows the embryo in the mother’s womb. Use it to answer the questions that follow.
a) Label the part X
X:___________________ 1mark
b) The embryo (number of chromosomes = 46) will develop further into a foetus by mitosis cell division. What is the number of chromosomes for the foetus? Explain your answer.
Chromosome number: ______________
Explanation: __________________________________________________
_______________________________________________________________3marks
4. Define the following terms
a) Genotype: ______________________________________________________ _______________________________________________________________1mark
b) Phenotype: ______________________________________________________
_______________________________________________________________1mark
5. A farmer crosses two of his roses, 1 red and 1 white. The red rose is homozygous dominant and a white is recessive for the trait.
a) Using an ‘R’ as a dominant allele and ‘r’ as a recessive allele, give a genotype of each rose.
Red rose: _______________ 1mark
White rose: _______________ 1mark
The offspring produced from the above parents were crossed to produce F2 generation. b) Use the punnet square to show the possible offspring of F2 generation.
2marks
c) A pink rose is produced by the heterozygote alleles during the interbreeding of F2 generation. Name this type of inheritance. Explain your choice.
Inheritance: _______________________ 1mark
Explanation:_____________________________________________________
_______________________________________________________________1mark
6. Shown in Box A is the diagram of a single chromosome of an animal.
The chromosome undergoes replication during cell division. Draw in Box B, the diagram of the chromosome after the cell division completed. Label your diagram.
2marks
7. The food web diagram below shows the interaction of species in a forest ecosystem. Use it to help you answer the questions that follow.
a) Give the name of ONE carnivore species from the food web.
__________________________________________________________________1mark
b) Explain the effect on the other species if one of the following species is removed from the food web.
i) Grasses: ________________________________________________________
_______________________________________________________________1mark
ii) Trees: _________________________________________________________
_______________________________________________________________1mark
c) Construct a food chain that consists of 4 species or trophic levels.
__________________________________________________________________1mark
d) The interaction of species shown in the food web is at its stationary phase. The amount of species removed is replaced in the same amount to give a stable community. Give the term to describe this type of community.
8. Microorganisms such as viruses, bacteria and fungi have their own way of reproduction. Give ONE way or method on how viruses reproduce.
a) Viruses: __________________________________________________________
__________________________________________________________________1mark
9. Explain the following
a) A painful swollen appears in the armpit region few days after the hand/arm is severely scratched. WHY?
_____________________________________________________________________1mark
b) Covering a wounded area with an antibacterial cream.
_____________________________________________________________________1mark
c) Measels disease occurs once for each individual.
PART II PHYSICS 20 MARKS
1. A stone of 4kg is held near the earth’s surface. It was released from a height of 10m and falls towards the ground. [g=10m/s2]
a) Give a reason why the mass falls toward the ground instead of moving upward.
__________________________________________________________________1mark
b) Name the force that act against the falling mass
__________________________________________________________________1mark
c) What will be the weight of the 4kg mass on earth?
1mark
d) The 4kg and 40kg masses are dropped from the same height of 10m. Which mass will reach the ground first? Give a reason for your answer.
_________________________________________________________________
_________________________________________________________________2marks
Weight =___________
e) The 4kg mass reaches a maximum speed of 9.0m/s as it nearly reaches the ground. f) Calculate the kinetic energy of the mass at this point.
Kinetic Energy = ______ 2marks
2. A current (I) flowing through a resistor is measured against the potential difference (V) across the resistor. The results are recorded in the table below.
Potential difference 0 6 12 18 24
Current I (Amp) 0 0.2 0.4 0.6 0.8
a) Plot the graph of potential difference (V) against the current (I)
1mark
b) Use your graph or by calculation to find the value of the resistance for the resistor [Hint: R =V/I].
1mark
c) The above graph obeys Ohm’s Law. State the Ohm’s Law.
__________________________________________________________________ __________________________________________________________________1mark
d) Sketch two other graphs on the grid in letter a to show the slope for the non-ohmic conductors.
2marks
3. A student standing on a bridge observes a piece of wood floating on the water. The wood moves up and down as the water waves pass. The wave passes at a constant velocity and causes the wood to move up and down (from trough to crest to trough) for 10 seconds.
a) Name the type of wave shown above.
__________________________________________________________________1mark
b) From the diagram above, determine the wavelength of the passing water waves.
1mark
c) Calculate the frequency of the passing water waves.
1mark
Wavelength = __________
Frequency = ____________
d) Calculate the speed of the water waves
1mark
e) On the diagram (Question 3), label with an ‘X’ the position of the wood 5 seconds after
reaching the crest. 1mark
4. The diagram below shows a simple electric motor. Use it to answer the questions that follow.
a) Draw on the diagram the direction of the magnetic field using the arrows.
1mark
b) What is the direction of the force on point P?
_______________________________________________________________1mark
c) Give one way that can increase the size of the current?
_______________________________________________________________1mark
Mass = _______
PART III CHEMISTRY 20 MARKS
1. The diagram below shows part of the periodic table and the first 20 elements shown in symbols.
a) Using the periodic table above, give the SYMBOL of ONE element that has 3 outer electrons.
Symbol: _________________________________________________________1mark
b) Which element has a bigger atom, Li or Na? Circle your answer below and give ONE reason for your choice.
Li Na 1mark
Reason:
__________________________________________________________________1mark
2. Magnesium atom can react with Chlorine atom to form magnesium chloride compound and it exist as a solid.
a) What type ofsolid is Magnesium chloride compound?
__________________________________________________________________1mark
b) If the reaction produces 1 mole of Magnesium chloride (MgCl2), calculate the mass of the
chloride ion present in the compound. [Mr Mg = 24.3g/mol Mr Cl = 35.5g/mol]
3. The diagrams below (A, B and C) represent three types of SOLID structures.
a) Give a reason why Structure A shows a metallic structure arrangement?
________________________________________________________________________
________________________________________________________________________2marks
b) Structure C can conduct electricity. Explain.
__________________________________________________________________ __________________________________________________________________2marks
4. Ethanol can be produced by mixing sugar and yeast in a water. The diagram below shows a simple set up in ethanol production.
a) What is the purpose of using limewater in the above set up?
__________________________________________________________________ __________________________________________________________________1mark
b) The method shown in the diagram (Question 4) is slow and inefficient in producing concentrated ethanol. Give the best separation method to obtain a more concentrated ethanol. Suggest a reason for your choice.
Separation Method: __________________________________________________1mark Reason: ___________________________________________________________
__________________________________________________________________2marks
5. Complete the following table showing the chemical or structural formula and names for some organic compounds.
Name (IUPAC/systematic names) Chemical formula OR Structural formula
2-methylbutane a) _______________________
Pentanoic acid b) _______________________
c) ___________________
CH2=CH2
3marks
6. A piece of marble containing calcium carbonate is added to a dilute Hydrochloric acid solution. The carbon dioxide gas is collected in a graduated tube and its volume is recorded each minute.
The results are shown in the table below, Time
(min)
0 1 2 3 4 5 6 7
Volume of gas (ml)
0 3 10 29 48 51 52 52
a) Plot a graph for the above result shown in the table on the grid provided below.
1mark
b) Give the time range when the reaction is very fast.
Time range:______________________________________________________1mark
c) If the catalyst was added to the reaction, DRAW another slope on the graph to show this reaction
CODE NUMBER
MARKER’S USE ONLY
SECTION A MC
SECTION B TOTAL
BIOLOGY PHYSICS CHEMISTRY
