11 extra excercise paper 2

8/9/2019 11 Extra Excercise Paper 2

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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

Page 155-156


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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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11 extra excercise paper 2

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