اختبار الكتروني كتاب العلوم لغات

1
The transparent and translucent objects have the same color of ……..
2
the magnetic force of the electromagnet will be lost by……
3
The white clothes appear white when white light falls on them, because ………..
4
magnetic effect of the electric current can be detected by using …..
5
When white light falls on an orange translucent box , ……..
6
when the compass is put beside a wire carrying an electric current ………………
7
the magnetic force of the electromagnet increases by….
8
the natural magnet is made of one of iron ores called …….
9
the most attraction force of the magnet exists ………
10
magnets are divided into ……. Types
11
Atmospheric air and mineral water are…………
12
Mixing salt with water produces a …..
13
To form a salty solution , we add salt to water with………
14
Most mixtures formed by dissolving in liquids are ………
15
Fruit salad is an example of …..
16
Introducing rabbits into an island that is a suitable environment with much food and no enemies will lead to the environmental……..
17
All the following are the components of the ocean ecosystem except
18
The …….can simulate the colour of the surrounding environment .
19
All the following are living organisms of an ecosystem except the
20
The …….ejects a black fluid in the surrounding water when attacked by an enemy.