11 extra excercise paper 2
TRANSCRIPT
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1. Diagram 1 shows a cross section of a human eye.
DIAGRAM 1
(a)(i) Label the following structures in Diagram 1.
(ii) State one function of the structure in (a)(i)
........................................................................................................................
Cilliary muscle CorneaAqueous humour
Aqueous humour : maintain the eye ballCilliary muscle : Controls the thickness of the lensCornea : Allow light to enter the retina
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(b) (i) The following sequence shows the pathway of light ray travel into the
eye.
Cornea Aqueous humour Y Lens
(ii) Explain what happen to Y when the intensity of light increase.
...............................................................................................................................
Make Yin Diagram 1.
Y
Y becomes smaller
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Information Name the spot of the retina
Most sensitive to
light
Not sensitive to light
TABLE 1.1
(d) (i) A person who is defects of vision. Structure P in the eyes became thickest.
Mark letter X on line MN the formation of image.
(ii) Name the structure P.
(c) Complete the Table 1.1.
Yellow spotYellow spot
Blind spotBlind spot
X
Lens
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2. Diagram 2 shows an experiment the transfer of heat
through three different rods.
Table 2.1 shows the result of the experiment.
Type of Rod Time taken for the thumbtack fall / second
X 120
Y 90
Z 200
TABLE2.1
DIAGRAM 2
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(a)How is heat transferred through rod X, Y and Z?
(b) (i) Arrange the rods according to heat conductivity in ascending
order.
Rod ., Rod .., Rod ..
(ii) Explain your answer in (b) (i).
Conduction
Y X Z
Thumbtack Y falls of first, followed by thumbtack X
and Z.
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(c) (i) Rod X, rod Y and rodZare made of metal.
Circle the metallic rod that is most suitable to use in makingcooking utensils.
Rod X Rod Y Rod Z
(ii) Give one reason for your answer in (c) (i).
..
.
(d)What conclusion can you draw from this experiment?
Rod Y is the best heat conductor.
Different metals conduct heat at
different rates.
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DIAGRAM 3
3. Diagram 3.1 shows an experiment to study the effect of heat on eggshells.
The gas produced turns lime
(a) (i) Why does lime water turn cloudy?
...
(ii) Egg shell contains calcium carbonate. State three elements contained in the egg shell.
........................, .,
(b) Write a word equation for the reaction of heat on egg shell.
Present of carbon dioxide gasPresent of carbon dioxide gas
Calcium, carbon , oxygenCalcium, carbon , oxygen
HeatHeat
Calcium carbonateCalcium carbonate Calcium oxide + Carbon dioxideCalcium oxide + Carbon dioxide
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(c) In Table 3.2, mark with ( / ) one example of chemical material that can produced the
same gas as eggshell.
Chemical Material Mark with ( / )
Calcite
Mable
Corals
(d) Diagram 3.3 shows the heated eggshell is placed in a crucible. A few drops ofwater is dripped on the eggshells. The solution formed in the crucible is tested
with red litmus paper. The colour of red litmus paper turns to blue.
DIAGRAM3.3
Table 3.2
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(i) Why does the red litmus paper turns to blue?
(ii) When more hydrochloric acid is added to the product formed in
Diagram 3.3.
State your observation the colour of litmus paper and give your
reason.
Observation :
...
Reason :
...
(e) Describe the properties of eggshell when heated strongly.
...
Calcium oxide is alkalineCalcium oxide is alkaline
Litmus paper does not changeLitmus paper does not change
Because acid neutralise the alkaline.Because acid neutralise the alkaline.
Calcium carbonate changes to calcium oxide and carbondioxide is released.
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Flower P
Filament
4. Diagram 4.1 show two flowers from different plants.
Draw line as shown above.
Flower Q
( a ) On Diagram 4, draw lines to show the correct match between the
parts of flower P with the part of flower Q using the following words
DIAGRAM 4
Filament
Stigma Anther Ovary
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DIAGRAM 4.2
(b) Study the structure of the flower Q and suggest how the flower is pollinated. Give one
reason for your
answer.
(i) Agent of pollination :
...(ii) Reason :
...
(c) Diagram 4.2shows two flowers from different plants of the same species.
(i) mark using arrow () to show the path of transfer of pollen grains in self pollination.(ii) mark using arrow ( ) to show the path of transfer of pollen grains in cross
pollination.
WindWind
Long and feathery stigma.Long and feathery stigma.
Produce new varieties of plants
(d) State one advantage of cross pollination over self pollination.
..
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5. Diagram 5shows the position of three students, Joe, Adam and Raj
in a rope climbing competition.
DIAGRAM5
(a) Calculate the work done by each student.
Student Work done
(i) Joe
(ii) Adam
J = N x m=(50 x 10) x 2 = 1000 J
J = N x m=(55 x 10) x 5 = 2750 J
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(b) What is the power used by Adam to climb up the rope
in 10 second?
(c) (i) What is the vertical distance traveled by Raj if he has done
1750 J of work?
(ii) Base on (c) (i) , calculate the power developed by Raj in
20 seconds.
Power( w ) = Work ( J )
Time ( s )= 2750 = 275 watt
10
Work (J ) = Force ( N ) x Distance (m)
1750 J = 60 kg x 10N x Distance (m)
Distance (m) = 1750 = 2.92 m
600
Power( w ) = Work (J )
Time ( s )
= 1750 = 87.5 w
20
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6. Diagram 6shows a transformer.
(ii) Based on observation in (a)(i), name the type of transformer in Diagra
..
DIAGRAM 6
(a)(i) Name the coils P and Q in the transformer.
P:
Q:
Primary coil
Secondary coil
A step-down transformer
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(c) The number of turns in P and Q are shown below.
P : 2000turns Q : 500turns
The bulb light up with normal brightness. Calculate the input voltage.
(b) State one function of the transformer shown in Diagram 6.
.To reduce the voltage of the alternating current.
Input Voltage = Primary coil
Output Voltage Secondary coil
Input Voltage = 2000240V 500
Input Voltage = 2000 x 240
500
= 960 V
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