Download First term Science Al – Karma Language School Prep 1 Revision on

First term
Al – Karma Language School
Science
Prep 1
Revision on unit 2
Question One:
A)-Complete the following statements:
1. Heat is a form of ---------- which transfers from the object of ---------- temperature to another of ---------- temperature.
2. Heat transfers by three methods which are --------,--------- and
------------.
3. Heat is transferred through air by --------- and ----------.
4. The potential energy increases by increasing the --------- of the body
and its ---------- from the ground.
5. The measuring unit of work is ---------- , while that of force is -----------.
6. The measuring unit of energy is ------------.
7. ----------- is a permanent resource of energy, while ---------- is a
renewable source of energy.
8. Mechanical energy = ------------+ ------------.
9. Potential energy = ------------- x ------------.
10. Kinetic energy = ½ x ---------- x ------------.
11. In the simple cell, the -------- energy changes into ---------energy.
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First term
Al – Karma Language School
Science
Prep 1
12. The simple cell consists of ---------- solution dipped in it two different
----------.
13. Friction turns ---------- energy into ----------energy.
14. By increasing the particles movement, the temperature -----------.
15. Heat transfers through solids from one end to another by ----------.
B)- Choose the correct answer:
1. An object of 5 Kg moves with velocity of 5 m/s, its kinetic energy is ----------joules.
(62.5 – 125 – 12.5 – 25)
2. When the height of an object is doubled, its --------------.
(kinetic energy will be doubled – mechanical energy will be four times its
value – potential energy will be doubled – potential energy will be three times
its value)
3. On rubbing your hands, the ----------------.
(heat energy is converted into sound energy – kinetic energy is converted into
heat energy – heat energy is converted into kinetic energy – sound energy is
converted into heat energy)
4. The heat is transferred through solids by ---------------.
(conduction & convection – conduction & radiation – radiation only – conduction
only)
5. The sun is -------------------.
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First term
Al – Karma Language School
Science
Prep 1
(a resource of permanent energy – a resource of non permanent energy –not
an energy resource – producing no energy)
6. In the electric bulb, electric energy changes into -------------.
(heat energy only – light energy only – chemical energy – heat energy and
light energy)
7. In home when gas stove is working there is a change from ---------.
(heat energy into a chemical one – chemical energy into a heat one – chemical
energy into a sound one – light energy into heat one)
8. Mechanical energy is converted into heat energy by -------------.
(chemical reaction – friction – electric lamp)
9. Food and fuel are sources of energy -----------.
(Chemical – mechanical – electric –sound)
10. --------- is from the clean sources of energy.
(Petrol –Coal –Wood – Wind)
11. In the simple pendulum, the ------------.
(mechanical energy changes into sound energy – mechanical energy changes
into light energy – Kinetic energy changes into heat energy – Potential energy
changes into kinetic energy and vice versa)
12. In the solar cells, the solar energy changes into --------- energy.
(kinetic – potential – sound – electric)
Question (2)
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First term
Al – Karma Language School
Science
Prep 1
A)- Give reason for:
1. The fuel inside the car is similar to the food inside the body of living bodies.
-------------------------------------------------------------.
2. The freezer is found at the top of the fridge.
------------------------------------------------------------.
3. The production of electricity from solar energy is preferred than burning
of fuel.
------------------------------------------------------------.
4. Heater is put at the bottom of the room.
------------------------------------------------------------.
5. Energy is neither created nor destroyed.
------------------------------------------------------------.
B)- From the opposite figure:
Picture page 25
What happens to the compass?
---------------------------------------------------------------------------------------------------------------------------C)- In the opposite figure, what does the arrows indicate?
(1). -----------------.
(2).------------------.
(3). ------------------.
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Picture page 24
First term
Al – Karma Language School
Science
Prep 1
(4).-------------------.
(5).-------------------.
Question (3)
Problems:
1. Find the weight of an object of potential energy 88 joules when
found at a height 11 m.
2. An object has a kinetic energy 46 joule and is moving at a
speed 4 m/s find the object mass.
Question (4):
A)-Write the scientific term:
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First term
Al – Karma Language School
Science
Prep 1
1. A form of energy stored in the food.
(---------------)
2. The ability to do work or to make a change.
(----------------)
3. The energy stored in the object due to work done on it. (-------------)
4. The way by which the heat is transferred through gases and liquids.
(---------------)
B)- Study the opposite figure then answer the following questions:
1. Heat will transfer from ---------- to ----------.
2. The transfer of heat will stop when ------------.
60 °C
(A)
40 °C
(B)
C)- What is meant by:
1. Potential energy of an object = 50 joules.
------------------------------------------------------------.
2.
Kinetic energy of an object = 10 joules.
------------------------------------------------------------.
3. Mechanical energy of a moving body = 100 joules.
------------------------------------------------------------.
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First term
Al – Karma Language School
Science
Prep 1
D)- Mention the changes of energy in each of the following:
1. Sewing machine: --------------------------------------------.
2. Alarm clock: -----------------------------------------------.
3. Television : ------------------------------------------------.
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