Name: …………………………….
‫مدارس رويال الدولية للغات‬
Class: ………………..............
Primary 6 Science
Midterm Revision sheet
Model Answer
Q1: Write the scientific term:
1. A rigid bar, straight or curved, rotates on a fixed point, and is affected by a force and
resistance.
[ Levers ]
2. The fixed point on which a rigid bar rotates.
[ Fulcrum ]
3. Levers that have the fixed point between the force and resistance. [ 1st class levers ]
4. Levers that have the force between the resistance and fixed point. [ 3rd class levers ]
5. Levers that have the resistance between the force and fixed point. [ 2nd class levers ]
6. A type of levers that has the effort between fulcrum and resistance force.
[ 3rd class levers ]
7. Levers where the resistance lies between effort force and fulcrum. [ 2nd class levers ]
8. The type of levers in which the force arm can be equal to the resistance arm.
[ 1st class levers ]
9. Force x its arm = Resistance x its arm.
[ Law of levers ]
10. The distance between the effort force and the fulcrum.
[ effort arm ]
11. The distance between the resistance and the fulcrum.
[ resistance arm ]
12. The measuring unit of the effort force and resistance.
[ Newton ]
13. The measuring unit of effort arm and resistance arm.
[ cm or m ]
14. It's a method of connecting electric lamps parallel to each other and electricity has different
routes to flow through.
[parallel connection ]
15. It's a method of connecting electric lamps one after another and electricity flows in one
path.
[ series connection ]
16. A type of lamps that contains mercury vapor.
[ fluorescent lamps ]
17. A way in which the light bulbs are connected one after another and the light intensity
decreases by increasing number of bulbs.
[ series connection ]
18. Means of converting electric energy to the light energy.
[ electric lamps ]
19. The flow of electric charges through material conducting electricity. [ electric current ]
20. A coiled thin wire made from tungsten.
[ tungsten filament ]
21. An inactive gas used in electric lamps to protect the filament from burning. [ argon gas ]
22. A closed path where an electric current pass making a complete cycle. [ closed circuit]
23. The way where the bulbs are connected by branching routes and the lightening of the
lamps is not affected with the increase in their number.
[parallel connection ]
Prim6_2nd Midterm Revision Sheet_ model answer_2016
Page 1
Name: …………………………….
‫مدارس رويال الدولية للغات‬
Class: ………………..............
Q2: Complete the following statements:
1. The tweezers is a third class lever while scissors is from first class levers.
2. In the wheel barrow, the resistance lies between the effort and the fulcrum.
3. In the manual broom , the effort lies between the resistance and the fulcrum.
4. In first class levers, the fulcrum lies between resistance and effort force.
5. Nutcracker is a second class lever, while the pliers is a first class lever.
6. Crowbar is an example of the first class levers, while bottle opener is a second class
lever.
7. Scissors and seesaw swing are first class levers
8. Second class levers save effort because its effort arm is longer than the resistance arm.
9. Third class levers don't save effort because the effort arm is shorter than the resistance
arm.
10. Levers make the job easier to do through increasing force and increasing distance.
11. Among functions of lever is to avoid danger as in coal holder .
12. Tweezers are used in picking up minute (very small) objects
13. The Hockey increases the speed of the ball, while manual broom is used to increase
distance of the force and move it from one place to another.
14. The crow bar is considered a first class lever, while tweezers is a third class lever.
15. Some levers save effort through using small force to move a big load as in the crowbar.
16. The second class levers always save effort because the force arm is
longer than the
resistance arm.
17. If the arm of force is longer than the arm of resistance, then the force is smaller than
the resistance.
18. Second class levers always save effort, while third class levers never save.
19. The filament of the light bulb is made of tungsten
20. When several lamps connected in parallel the electric intensity doesn't change.
21. The filament of the light bulb is made of tungsten
22. If one of the lamps connected in series is burnt out, the other lamps turn off.
Prim6_2nd Midterm Revision Sheet_ model answer_2016
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Name: …………………………….
‫مدارس رويال الدولية للغات‬
Class: ………………..............
Q3: Correct the underlined word:
1. The tweezers is a second class lever.
[ third ]
2. The scissors is a second class lever.
[ first ]
3. The coal holder is used to avoid speed.
[ danger ]
4. The manual broom is used to increase force.
[ distance ]
5. All first class levers save effort.
[ second ]
6. All first class levers don't save effort.
[ third ]
7. Wheel barrow is a third class lever.
[ second ]
8. The manual broom works on increasing force.
[ distance ]
9. The bottle opener is a third class lever.
[ second ]
10. In third class lever the resistance lies between fulcrum and resistance. [ effort ]
11. Third class levers are most popular levers used in our daily life.
[ first ]
12. Scissors and pliers are examples of third class levers.
[ first ]
13. First class levers always save effort.
[ sometimes ]
14. Second class levers don’t save effort.
[ third ]
15. The force arm is always longer than resistance arm in first class levers. [second ]
16. The distance between fulcrum and effort force is called the resistance arm of lever.
[ effort arm ]
17. Some of the second class levers save effort.
[ first ]
18. First class levers never conserve effort.
[ sometimes ]
19. There are two points of connection from inside on both tips of the lamp. [outside ]
20. Electric lamps change electric energy into chemical energy.
[ light ]
21. The glass bulb of electric lamp contains an active gas.
[ inert/inactive ]
22. Fluorescent lamps contain neon gas.
[ argon ]
23. The filament in electric lamps is made from copper.
[ tungsten ]
24. Lamps in commercial stores are connected in series.
[ parallel ]
25. When connecting several lamps in series the light intensity increases. [ decreases ]
26. If one lamp is broken in the house, the rest of the lamps turn off.
[ don't turn off ]
27. Decorative lamps in festivals are connected in series.
[ parallel ]
28. There is/are two tungsten filaments at each end of the fluorescent lamp. [ one ]
29. There are three connecting points at each end of the fluorescent lamp. [ two ]
Prim6_2nd Midterm Revision Sheet_ model answer_2016
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Name: …………………………….
‫مدارس رويال الدولية للغات‬
Class: ………………..............
Q4: Choose the correct answer:
1. The resistance is between the force and fulcrum in the …….
a. Nutcracker
b. scissors
2. The force is between the resistance and fulcrum in the …….
c. sweet holder
a. Nutcracker
b. scissors
nd
3. The 2 Class levers………….save effort.
c. sweet holder
a. Always
b. sometimes
c. never
4. In 3rd Class lever the force arm is …………the resistance arm.
a. Longer
b. shorter
c. equal to
5. The Levers of 1st Class …………… save effort.
a. Always
b. sometimes
c. never
6. The force arm of the ………… levers is longer than the resistance arm.
a. 1st class
b. 2nd class
c. 3rd class
7. One of the following levers transfer force from one place to another…………
a. Manual broom
b. nutcracker
c. wheelbarrow
8. All of the following levers are third class levers except…………….
a. Wheel barrow
b. fishing rod
c. sweet holder
9. ………..is considered from third class levers.
a. Fish hook
b. see-saw
c. nutcracker
10. In ………… class levers, the resistance lies between fulcrum and effort force.
a. First
b. Second
c. Third
11. The effort lies between fulcrum and resistance in ……………..class levers
a. First
b. Second
c. Third
12. The force and the resistance are equal in some levers of…………………
a. First
b. Second
c. Third
13. The filament is made from Tungsten because it has a ….…………… point.
a. High boiling
b. High melting
c. Low melting
14. One of the following gases is found in the fluorescent lamp but not in the electric bulb..
a. neon
b. Argon
c. mercury vapor
15. Fluorescent lamps contains argon gas and a little of ………………………..
a. Hydrogen gas
b. mercury vapor
Prim6_2nd Midterm Revision Sheet_ model answer_2016
c. atmospheric air.
Page 4
Name: …………………………….
‫مدارس رويال الدولية للغات‬
Class: ………………..............
16. The fluorescent lamp is covered from inside with ………………………..substance.
a. golden
b. phosphoric
c. oily
17. When increasing the number of lamps connected in series, the light intensity……....
a. Decreases
b. increases
c. doesn't change
18. When removing one of the lamps connected in parallel with other lamps, the electric intensity…..
a. decreases
b. increases
c. doesn't change
19. When disconnecting an electric lamp from a series connection, the rest of the lamps…………
a. Stay lighting
b. turn off
c. make a spark.
Q5: Solve the problem:
1- A lever is affected by a force of 150 Newton, a resistance of 300 Newton and the effort
force arm was 20 cm. Calculate the resistance arm.
Effort force X its arm = Resistance X its arm
150
X 20
=
300
X ?
Resistance arm = 150 X 20 = 3000 = 10 cm
300
300
2- A lever is affected by a force of 50 Newton and its force arm is 20 cm. Given that the
resistance arm is 5 cm, calculate the resistance force
Effort force X its arm = Resistance X its arm
50
X
20
=
?
X
5
Resistance force = 50 X 20 = 1000 = 200 Newton
5
5
3- The exerted force equals 500 Newton and length of its arm is 20 cm and is affected by
resistance with a value of 200 Newton. Find the value of the arm of the resistance.
Effort force X its arm = Resistance X its arm
500
X 20
=
200
X
?
Resistance arm = 500 X 20 = 10000 = 50 cm
200
200
4- The arm length of a third class lever is 5 cm and the length of the arm of the resistance is
15 cm. if the resistance has a value of 300 Newton , calculate the value of the affecting
force .
Effort force X its arm = Resistance X its arm
?
X
5
=
300
X
15
Effort force = 300 X 15 = 4500 = 900 Newton
5
5
Prim6_2nd Midterm Revision Sheet_ model answer_2016
Page 5
Name: …………………………….
‫مدارس رويال الدولية للغات‬
Class: ………………..............
Q6: Give reason:
1- In the 2nd class lever the force is always less than the resistance.
Because in 2nd class levers, the effort arm is always longer than the resistance
arm, So the effort force is less than the resistance force.
2- Third class lever don’t save effort.
Because the effort arm is shorter than the resistance arm, so the effort is bigger
than the resistance.
3- In some of the first class levers, the effort force is equal to resistance force.
Because in some of the first class levers, the effort arm is equal to the resistance
arm.
4- In 2nd class levers the effort doesn’t equal to resistance.
Because the effort arm is always longer than the resistance arm, So the effort
force is less than the resistance force.
5- The presence of two pieces of lead in the electric lamp.
To connect the lamp with electricity
6- The filament of the light bulb is made of tungsten.
Because tungsten has a high melting point which protects it from melting at
high temperatures.
7- The presence of inert gas inside the light bulb
To increase the lifetime of the filament as the inert gas doesn’t burn the
filament and doesn’t help in burning it.
8- Decorative lamps are connected in parallel not in series.
Because when the lamps are connected in parallel the light intensity doesn't
change and the lamps stay lighting.
9- Although some levers don’t save effort but they are important in our life.
Because they are used to increase speed or increase distance or avoid danger or
do the job accurately.
10- Wheel barrow is considered from second class lever.
Because the resistance force lies between the effort force and the fulcrum.
Prim6_2nd Midterm Revision Sheet_ model answer_2016
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Name: …………………………….
Class: ………………..............
‫مدارس رويال الدولية للغات‬
Q7: What happens if:
1- Atmospheric air enters the electric bulb through a hole in the base.
It will burn the filament.
2- The tungsten filament of the light bulb is replaced with copper.
The filament will melt at high temperature.
3- Connecting all light bulbs in series in the house.
If one lamp is burnt, all the other lamps will turn off.
4- Increasing number of lamps in an electric circuit connected in series.
The light intensity will decrease and will be weak.
Q3: Write the labels on the figure A and write the type of connection in figure B and C:
[A]
[B]
[C]
series connection
parallel connection
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