Download electric conductors

Egyptian language school
Science Department
Model answer for the school book questions
Second Term
Prim (6)
First Exercise
PAGE 90-93
Q1- Choose the correct answer:1- c
4- c
7- b
10- b
2- b
5- a
8- c
11- a
3- b
6- c
9- c
12- a
Q2- Problem 1):F x F .arm = R x R .arm
X x 5 = 1 x 10
X = (1 x 10)/5
X = 2 Newton
Q2- Problem 2):F x F .arm = R x R .arm
4x 5 = 2 x y
Y = (4 x 5)/2
Y = 10 cm
Q3- Give reason:1- Bec. they may have other benefits such as increasing
distance (hokey bat) or avoid dangers such as (tweezers).
2- Bec. theeffort arm does not equal the resistance arm.
3- Bec. they make the tasks perform more easily by the means
of increasing distance, increasing force and avoid dangers.
4- Bec.it has a high melting point.
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Prim.6 - Model answer of the school book
Egyptian language school
5- To avoid the turning off of any lamp when one of the lamps is
turned off or damaged.
6- Bec.it carries the lamp upright, position it and connect it with
the electric circuit.
7- Bec.it helps in the penetration of the root hair through soil
particles.
8- Bec. theconcentration of the solution inside the vacuoles is
more than the concentration of the solution in the soil.
9- To allow the loss of water in the form of water vapour
through transpiration process.
10- Bec. theepidermal cells are lost from time to time by the
resistance of soil particles during the expansion of the root.
11- To control opening and closing the stoma.
12- Bec.this membrane has the selective permeability that
allows only some salts to pass according to the need of the
plant.
13- To avoid electric shock.
Q4- What's meant by each of the following:1- They are materials that do not allow the flowof electricity through
them.
2- One of the dangers of electricity occurs as a result of the increase
in the temperature of the electric wires.
3- It is the path in which the electric current passes through it.
4- It is the ability of the cellular membrane in the root hair to allow
only some salts to pass according to the need of the plant.
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Egyptian language school
Q5- Explain the rise of juice and water to
the parts of plants:*Root hair in the epidermis of the root absorbs water from
soil. This is because the salt concentration inside vacuole is
larger than salt concentration inside soil.So,water flows from
the soil into the root hair through its semi-permeable
membrane by osmosis. Then, it moves through root cells,
which contain a composition of cells called endodermis
which regulate water crossing into a tissue called xylem
where the juice is raised to reach the stem and then to the
leaves to make photosynthesis process.
Q6- ProblemF x F .arm = R x R .arm
100x 25 = 500 x R .arm
R .arm = (100 x 25)/500
R .arm = 5 cm
Second Exercise
PAGE 94-95
Q1)Write the scientific term
1- Electric conductors ( Good Conductors of Electricity)
2- Levers (Second class)
3- Galaxies
4- Transpiration process
Q2) Choose the correct answer
1- b
2- c
3-a
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Prim.6 - Model answer of the school book
Egyptian language school
Q3- What would happen:1- All the lamps will turn off when one of the lamps is turned off
or damaged.
2- Total lunar eclipse takes place.
3- Partial lunar eclipse takes place.
Q4- Put ( √ ) or ( X )
1-( √ )
2-( X )
4-( √ )
5-( X )
3-( X )
Q5- Give reason:1-Bec.it has a high melting point.
2-To avoid burning of the filament so that the life time of the
filamentincreases.
3-To control opening and closing the stoma.
4- Bec.water is a good conductor of electricity.
Q6- What is meant by:1- One of the dangers of electricity occurs as a result of the passage of
the electric current to the human body.
2- It is the type of solar eclipse in which the sun appears as a lighting
ring and it is formed when the moon is in a higher orbit from earth so, its
cone shadow doesn't reach the earth.
3- Are astronomical observatories that study stars and galaxies from
their location outside Earth's atmosphere.
4- They are groups of millions of stars forming beams of light in the
middle of extreme darkness in space.
5- It is the losing of water in the form of water vapor from the leaves of
the plant through holes called stomata.
6- It is the ability of the cellular membrane in the root hair to allowonly
some salts to pass according to the need of the plant.
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Prim.6 - Model answer of the school book
Egyptian language school
Third Exercise
PAGE 96-110
Q1)Complete:123456789101112-
A lever
rigid bar
First, third
Thomas Edison
parallel
argon
Conductors, insulators
Electric shock
Earth, sun, moon
Spiral, four arms
Viscous
Selective permeability
Q2)Write the scientific term
1234567891011-
Second class levers
Law of levers
Filament of the light bulb
Levers (Second class)
Series connection
Electric insulators
Partial lunar eclipse
Galaxies
A telescope
Stomata
Transpiration process
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Egyptian language school
Q3- Give reason page (97-98):1-
To avoid the turning off of any lamp when one of the
lamps is turned off or damaged.
2- Bec. thesun emits harmful radiations such as ultraviolet
and infrared that harm the retina in the eye cause
blindness in a few seconds.
3- Bec. theresistance arm is always longer that the effort arm
so that the effort force is always bigger than the resistance
force.
4- To allow the electric current to pass through it.
5- To avoid the occurrence of the electric shock if we touch it.
6- To avoid the occurrence of electric fire.
7- Bec. themoon becomes between the Earth and the Sun in
a nearly one straight line and it hides the sun completely.
8- Bec. thesun emits harmful radiations such as ultraviolet
and infrared that harm the retina in the eye causing
blindness.
9- To be opened at night to expose and direct the telescope
towards any part of the sky.
10- To find suitable reasons for the occurrence of different
astronomical phenomena.
Q4) Put ( √ ) or ( X )
1-( X )
2-( X )
3-( √ )
4-( X )
5-( X )
6-( X )
7-( √ )
8-( √ )
9- ( X )
10-( √ )
11-( √ )
12-( √ )
13-( √ )
14-( √ )
15-( √ )
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Prim.6 - Model answer of the school book
Egyptian language school
Q5) Choose the correct answer
1-c
2-b
3-a
4-c
5-b
6-b
7-c
8-b
9-d
10-c
11-c
12-b
Q6)Correct the underlined words
1-second
2-inert
4-second
5-two filaments of tungsten
7-water
8-copper
9-a period of time
10-annular
11-Galileo
12-root hair
13-two guard cells
3-an electric conductor
6-light
14-Transpiration
Q7)Compare between each one of the
following:1- The levers
P.O.C
Definition
First class
Second class
Third class
The lever which
has the fulcrum
between force
and resistance
The lever, which
has the
resistance
between the
force and the
fulcrum.
The lever, which
has the effort
between the
fulcrum and the
resistance.
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Prim.6 - Model answer of the school book
Egyptian language school
2- Connecting electric lamps in series and parallel
P.O.C
Light intensity of
the lamps
Connecting in
series
The light intensity of
thelamps decreases
by increasing their
number.
Connecting in
parallel
The light intensity of
the lamps is the same
(doesn’t affect)
Removing one of
the lamps
all the light bulbs will
turn off
all the light bulbs
stay lighting (don’t
affect)
3-Electric conductors and insulators
Electric conductors
When the electric conductors present
in an electric circuit, they complete the
circuit to make it closed and allow the
electric current to flow through the
whole circuit.
Electric insulators
When the electric insulators present
in an electric circuit, they do not
complete the circuit, so the electric
current cannot flow through the
All metals are electric conductors such as
circuit.
iron, copper, aluminum.... etc.
Examples:Wood, plastic, rubber and
clothes
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Prim.6 - Model answer of the school book
Egyptian language school
4-Total solar eclipse and total lunar eclipse
Total solar eclipse
It is the type of solar eclipse in which
we can't see the sun completely
Total Lunar eclipse
Occurs when the whole moon
enters the shadow area (umbra) of
the Earth.
and it is formed in the shadow area
(umbra) of the moon
5-The light bulb and the fluorescent lamp (structure)
The light bulb
The fluorescent lamp
*it consists of
*it consists of
- the glass bulb
- tungsten filament
- the glass tube (the inner surface is covered
with phosphoric material)
- metal base
- tungsten filament (at each tip)
- two points of connection (at each tip)
6-Direct injuries and indirect injuries
Direct injuries
indirect injuries
Includes
*Fires resulting from electricity
*caused by electricity and they
*The electric shock
*Burns resulting from the
electric current
are not direct cause. Such as
falling from top of ladder due to
an electric shock.
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Prim.6 - Model answer of the school book
Egyptian language school
7-Umbra area and semi shadow area
Umbra area
It is the dark inner shadow in which
semi shadow area (penumbra)
It is the faint outer shadow in which
the total solar eclipse appears.
the partial solar eclipse appears.
Q8) Choose from column (B) that suits
column (A)
Table 1
(1-b)
(2-c)
(4-g)
(5-d)
(3-a)
Table 2
(1-c)
(2-b)
(3-e)
Table 3
(1-c)
(2-b)
Q9) What would happen if:1- The tasks won't be perform more easily.
2- We can't study or observe the distant objects or the space.
3- Total lunar eclipse takes place.
4- Annular solar eclipse takes place.
5- The lever conserve effort.
6- It will melt easily at high temperature.
7- The life time of the filament will decrease.
8- It leads to many dangers such as electric fire, electric shock
and electric burn.
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Egyptian language school
9- The electric current will not pass through the circuit.
10- It will cause electric shock.
11- His eyes (retina) will be harmed by infrared and ultraviolet
radiations.
12- The plant will not perform the transpiration process to get
rid of excess water.
13- Drops of water will be formed on the inner surface of the planter.
14- The stoma can't be opened or closed.
15- The plant can't absorb water from the soil.
16- The root hair can't penetrate the soil particles.
17- The water will move from the root of the plant to the soil.
18- (First case) Umbra and penumbra will be formed – (Second
case) An extension of the umbra will be formed (antumbra)
19- The fire will increase and it could harm the secures.
Q10)Write the labels on the following
figures
1st figure:
book page 30
2nd figure:
book page 79
3th figure:
book page 63
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Egyptian language school
Q11) Problems
Problem (1)
F x F.arm = R x R.arm
8x2=4xR.arm
R.arm = (8x2) / 4
= 4 cm
Problem (2)
F x F.arm = R x R.arm
400x20=Rx80
R = (400x20) / 80
=10 N
Problem (3)
F x F.arm = R x R.arm
480x40=Rx60
R = (480x40) / 60
=320 N
Problem (4)
F x F.arm = R x R.arm
400xF.arm=200x20
F.arm = (200x20) / 400
=10 cm
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Prim.6 - Model answer of the school book
Egyptian language school
Test (1) Page.111-112
Q1-Write the scientific term:a-fulcrum
b- Electric fire
c- root hair
d- excess water
Q2-Put (√) or (×) and correct the wrong one:a-x
(because) (although it doesn’t)
b-x
(water) (sand)
c-x
(root system) (leaves)
d-√
e-x
(smaller) (longer)
Q3-Complete:a-second
b-electric current (electricity)
c-stoma
d- R x R.arm
Q4-Compare:a- Solar eclipse and lunar eclipse
solar eclipse
Lunar eclipse
It is the astronomical
It is the astronomical
phenomenon occurs when the phenomenon which occurs when
earth, the moon and the sun are the sun, Earth and the Moon are
nearly on one straight line with nearly on one straight line with
the moon in the middle
the Earth in the middle hiding
the sunlight from the moon.
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Egyptian language school
b- Good conductors and insulating materials of
electricity (the same answer of Q3 page 103)
Q5- Give reason:a- Because the solar eclipse occurs when the moon comes
between the Earth and the sun casts its shadow on the
Earth and the lunar eclipse occurs when the Earth comes
between the moon and the sun casts its shadow on the
moon.
b- To prevent the occurrence of electric fire.
c- Bec. the fulcrum lies between the resistance and the
force.
d- Because they occur as a result of the Earth and the moon
rotation which can be calculated by the scientists.
Q6) ProblemF x F.arm = R x R.arm
500x20= 200 x R.arm
R.arm = (500x20) / 200
= 100 cm
Q7- Identify the astronomical phenomenon:
 The solar eclipse
 Look at page 63 in the school book for the labels.
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Prim.6 - Model answer of the school book
Egyptian language school
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Prim.6 - Model answer of the school book
Egyptian language school
 Test (2) Page.113-114
Q1- Choose the correct answer:a- Wheel barrow
b- galaxies
c- Doesn’t change
d- transpiration
Q2- Give reasons:1- To allow the passing of water and minerals from the soil to the
plant.
2- Bec. the fulcrum lies between the force and the resistance so
that the force arm can be longer than the resistance arm.
3- To increase the lifetime of the filament.
4- Bec it is a good conductor of electricity.
5- Bec the sun emits harmful radiations such as infrared and
ultraviolet that harm the retina in the eye causing blindness in
few seconds.
Q3- (a) What happens:1- It will melt easily at high temperature.
2- An electric shock takes place.
3- The root of the plant cannot control the movement of the
elements from and to the root hair.
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Prim.6 - Model answer of the school book
Egyptian language school
(b) Mention one function:1- it can be used in decorating commerecial stores and
commercial advertisement.
2-it can be used to observe and study the space and the distant
objects.
Q4-(a)Whats the difference between:1- The same answer of q4 p.103 in the school book.
2- The same answer of q1 p.102 in the school book.
(b)Whats meant by:1- lever: - it is a rigid bar rotates around fixed point called
fulcrum.
2-Transpiration: - The losing of water in the form of water vapor
from the leaves of the plant or from the other green parts to its
surrounding through holes in the plant leaves called stomata.
Q5- Correct the following:1- Human body is a good conductor of electricity.
2- We cannot see the sun completely in the total solar eclipse.
3- The root hair absorb water and minerals from the soil.
4- Galaxies are a group of millions of stars.
5- Stomata spread on the lower surface of the plants leaves.
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Prim.6 - Model answer of the school book
Egyptian language school
 Test (3) Page.115-116
Q1- Choose the correct answer:(a)
2-saturn
( b) 2-- nutcracker
(c) 1- solar eclipse takes time less than that of lunar eclipse
(d)2- the lighting of the bulbs decreases
(e) 2- decreasing the speed
Q2- Give reasons:1- Bec. theforce arm is always longer than the resistance arm.
2- To allow the flow of the electric current to the filament.
3-Due to the friction between the root hair and the particles of
the soil.
4-Bec the sun emits harmful radiations such as infrared and
ultraviolet that harm the retina in the eye causing blindness in
few seconds.
5-To allow the water to transfer from the soil to the root hair by
osmosis feature.
Q3- (a)What happens:1- The plant can’t perform transpiration process to get rid of
excess water.
2- The filament will burn.
3- We can’t study or even observe the space or any other
astronomical phenomenon.
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Prim.6 - Model answer of the school book
Egyptian language school
Q3- (b) Mention one function:1- Allow the plant to perform transpiration process to get rid of
excess water.
2- It sometimes increases the force when the effort arm is
longer than the resistance arm.
Q4- (a)Mention one difference:(Solved before)
Q4- (b)What is meant by:1- It is the fixed point in which the rigid bar rotates around.
2- It is the losing of water in the form of water vapour from the
leaves of the plants to its surrounding through holes called
stomata.
3- It is the transmission of water molecules through a semi
permeable membrane from an area of high concentration of
water to an area of low concentration of water.
Q5- Put (√) or (×) and correct the wrong one:1- × (the first class lever)
2- √
3- × (spiral shape) (four arms) (two hundred billions)
4- × (collecting light)
5- x (cytoplasm) (big vacuole)
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Prim.6 - Model answer of the school book
Egyptian language school
 Test (4) Page.117-118
Q1- Choose the correct answer:(a)
1-sweetholder
(b) 1- iron
(c)2- root hair
(d) 2- Galileo
Q2- Write the scientific term:(a)
Series connection
(b)
Transpiration process
(c)
Galaxies
Q3- Put (√) or (×) and correct the wrong one:1- × (thin)
2- × (lower)
3-× (Saturn)
4- × (solar)
5-×(argon)
6-√
Q4- Give reason:1- To allow the penetration of them through the soil particles.
2- To prevent the turning off of the lamps if any one of them is
turned off or damaged.
3- ( Bec. the force arm is always shorter than the resistance arm.
4- To protect the filament from burning and increase the life time
of the filament.
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Prim.6 - Model answer of the school book
Egyptian language school
Q5- Mention some precuatins in dealing with
electricity:-look at your school book page (43)
Q6- Problem:F x F.arm = R x R.arm
50 x 20 = R x 5
R = (50 x 20) / 5
= 200 N
Q7- Classify the following machines :Bottle opener is a second class lever.
Seesaw is a first class lever.
Fishing hook is a third class lever.
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Prim.6 - Model answer of the school book
Egyptian language school
Test (5) Page.119-120
Q1- Complete:1- Force – resistance
2- Force – resistance
3- Direct injuries – indirect injuries
4- Moon – Earth
Q2- (a) Write the scientific term:1- Third class levers
2- Total lunar eclipse
3- Parallel connection
(b) Label:1- A piece of lead
2-Metal base
3-metal wire
4-glass bulb
5-tungsten filament
Q3- (a) Give reason:1- To allow the plant to get rid of excess water.
2- Bec the Earth is larger than the moon so that it blocks all the
Sun light from reaching the moon when it comes between Sun
and moon in a nearly one straight line.
3- Bec. theforce arm is always longer than the resistance arm.
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Prim.6 - Model answer of the school book
Egyptian language school
Q3- (b) What is meant by:1- The materials that allow the flow of electricity through.
2- The lunar eclipse that occurs when a part of the moon enters
the shadow area of the Earth (umbra).
Q4- (a) Put (√) or (x):2- (√)
1- (×) second
3-(x) argon gas
5-(x) short time (doesn’t exceed 7 minutes
4-(√)
and 40 seconds)
Q4- (b) Compare:*solved before
(c) Give reason:F x F.arm = 200 x 50 = 10000
R x R.arm= 1000x 10 = 10000
So,the lever is balanced because the F x F.arm = R x R.arm
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Prim.6 - Model answer of the school book
Egyptian language school
Test (6) Page.121-122
Q1- Complete:1- Force – resistance
2-Moon – sun
3-Galilio – telescope
4-Stomata – transpiration
Q2- :- Write the scientific term:1-First class levers
2-Galaxies
3-root (root hair)
4-light bulb (electric lamp)
Q3- (a) Give reason:1- Because the force arm is always shorter than the resistance
arm.
2- Bec. the salt concentration inside its vacuole is larger than salt
concentration in the soil.
3- To prevent electric shock.
Q3- (b) What is meant by:-
*solved before
Q4- (a) Put (√) or (x):1-(√)
2- (√)
3-(x) Short age 4-(x) jupiter
Q4- (b) Problem:F x F.arm = 500 x 10 = 5000
R x R.arm= 200x 20 =4000……………………..So,the lever is not
balanced because the F x F.armdoesn’t equal R x R.arm
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Prim.6 - Model answer of the school book