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اختبار الكتروني وحدة Energy
اختبار الكتروني وحدة Energy
نسخ
تكرار
1
The transparent and translucent objects have the same color of ……..
the absorbed light color
the transmitted light color
the reflected light color
the spectrum light colors
2
we wear white clothes in summer season to …….
reflect all light colours
absorb all light colours
refrect all light colours
absorb all light colours except red colour
3
When white light falls on an orange translucent box , ……..
the box absorbs all light colors and appears black
the box absorbs all light colors and allows the orange color only to pass through
the box reflects the orange color
the box absorbs the orange color and allows all light colors to pass through
4
The white clothes appear white when white light falls on them, because ………..
they absorb all light colors.
they reflect all light colors
they absorb all light colors except white color
they allow light colors to transmit through
5
the blachboard …….when White lights falls on it
absorbs all light colours
reflects all light colours
refracts all light colours
absorbs all light colours except red
6
all the following divices have an electromagnet inside them except the ….
electric bell
television
disc drive
refrigerator
7
when the compass is put beside a wire carrying an electric current ………………
no deflection occurs
the compass needle deflects
the compass needle will be destroyed
the compass needle will be destroyed
8
the magnetic force of the electromagnet increases by….
increasing the number of coil turns only
increasing the intensity of the electric current only
cutting off the electric current
both a,b
9
the magnetic force of the electromagnet will be lost by……
increasing the number of coil turns
increasing the number of batteries
cutting the electric current
switching on the key
10
magnetic effect of the electric current can be detected by using …..
ammeter
compass
iron fillings
both b,c
11
the most attraction force of the magnet exists ………
at its middle
at its two poles
near to its middle
at only one pole
12
the natural magnet is made of one of iron ores called …….
magnetite
magnetism
magnesia
hematite
13
the magnet has ……….poles
no
two
three
four
14
the similar magnetic poles ……….each other
attract
repel
don't affect
replace
15
magnets are divided into ……. Types
three
two
four
five
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