1st prep - 1st term
Science practical exam
Write down the energy transformation in each case :
1.
2.
3.
4.
5.
The model
Battery
Dynamo
Motor
Torch
Alarm





Answer
Chemical energy into electric energy
Kinetic energy into electric energy
Electric energy into kinetic energy
Electric energy into light energy
Electric energy into sound & kinetic
energy
Look and classify the following :
The model
1. Amoeba
Picture
The classification
2. Euglena
Micro-organisms
3. Paramecium
4. Worm
5. Jelly fish
Animals with soft bodies
6. Octopus
7. Cockroach
Arthropods – insect
8. Spider
9. Scorpion
Arthropods – arachnids
10.Scolopendra
Arthropods – myriapods
11.Shrimp
Animals with external
supported bodies
Which of the following sink in water or float on water surface and why ?
1. Coin
2. Oil
3. Cork
4. Iron nail
1- Coin and iron nail : sink in water bec. there densities are higher than that of
water .
2- Cork and oil : float on water surface bec. there densities are lower than that
of water .
Activity : to make a model of the simple electric cell :
Tools :
 A large lemon .
 A small compass .
 A copper wire .
 A zinc rod .
Steps :
1. Press the lemon to increase its juice .
2. Dip the zinc rod & a wire terminal into the lemon .
3. Coil the wire around the compass and tie other wire terminal in the zinc rod.
Observation :
 The needle of the compass deflects .
Explanation :
 When two different metals ( zinc & copper ) are dipped in an acidic solution ( lemon juice ) ,
the chemical energy changed into electric energy .
Activity 1 : the movement of particles & temperature :
Tools :
1. A small metallic spheres
2. Plastic jar .
3. Thermometer .
.
Steps :
1. Put the spheres in the plastic jar & record their temperature first .
2. Close the jar tightly , then shake it from 20 – 30 times then determine the temperature at the
end .
Observation :

The temperature of the spheres increase .
Explanation :


Spheres movement & their friction with each other causes temperature rises .
Temperature rises as the speed of spheres increases as the kinetic energy of the particles
increases .
Conclusion :

Kinetic energy converts into heat energy by friction .