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اختبار الكتروني درس Energy Transformations
اختبار الكتروني درس Energy Transformations
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تكرار
1
The mechanical energy of the ball of the pendulum at the highest point equals..........
kinetic energy only
kinetic energy ×potential energy
potential energy only
zero
2
When an object is thrown upwards,its..........
speed increases gradually
speed decreases gradually
kinetic energy increases gradually
potential energy decreases gradually
3
In the simple pendulum,the.
mechanical energy changes into sound energy
mechanical energy changes into light energy
potential energy changes into kinetic energy and vice versa
kinetic energy changes into heat energy
4
The changes of energy in the pendulum are similar to those occur in......
electric lamp
dynamo
electric bell
children's swing
5
Energy is neither created nor destroyed but it can be transformed into another form this law is known as law of.........
conservation of energy
conservation of matter
kinetic energy
Earth's gravity
6
In the car engine......
the chemical energy changes into heat energy
the heat energy changes into chemical energy
the heat energy changes into mechanical energy
.(a)and(c)together
7
The motor converts the electric energy into ........energy
magnetic
chemical
light
kinetic
8
The electric energy is converted into kinetic energy in......
electric lamp
cellular phone
electric fan
electric bell
9
The potential energy of pendulum=its mechanical energy-its kinetic
Yes
No
10
The simple cell consists of a sugar solution dipped in it two similar metals
Yes
No
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