اختبار الكتروني كتاب العلوم لغات

1
The front limbs of whales are modified into ......
2
The organs of birds that are adapted for the feeding are the......
3
Secretion of poison in some snakes is an example of ....adaptation
4
........is(are)from environmental changes that lead to adaptation
5
Ways of movement varied in mammels although all these mammels are structured with similar.......
6
Kinetic energy=.....
7
Who does work from the following cases?
8
Weight of the body on the Earth equals its.........
9
An object of 20 N weight and it is placed at a height of 5 m ,so its potential energy is........joules
10
Chemical energy is stored in the......
11
Potential energy equals.....
12
If you sit down under a lighted electric lamp,heat is transferred to you by.....
13
At home, when the gas stove is working ,there is a change from..........
14
Heat is transferred through solids by.........
15
By increasing the kinetic energy of particles, their........increases
16
Which of the following devices pollutes environment?
17
-(a)Heat is transferred from cube(A)to cube(B),because it is..........
18
The number of electrons that saturates the first four energy levels can be calculated from the relation............
19

20
The nucleus of.......... atom doesn't contain neutrons.
21
The symbol of copper atom is...........
22
The energy of the excited atom is.......... the energy of the atom in its ground state.
23
Amoeba, euglena and paramecium differ from each other in the ......
24
From gymnosperms plants is .....
25
Dicotyledon plants belong to ......
26
The seeds of gymnosperms plants exist inside........
27
Pea plant belongs to .....plants
28
The chemical symbol of nitrogen atom is..........
29
The motion of solid molecules is..........
30
The rule 2n² cannot be applied to the energy level...........
31
The mass number of an atom having 13 electrons and 14 neutrons equals...........
32
The attraction force among solid molecules is..............
33
The maximum number of energy levels in the heaviest known atom is.........
34
The symbol of copper atom is.........
35
The atom nucleus contains .........
36
Negative charged particles of negligible mass are.........
37
The nucleus of.....atom doesn't contains neutrons
38
When atomic number of an element equals its mass number .this means that there aren't ..........in the nucleus of this element
39
The liquid matter is characterized by all of the following except..........
40
........... is the monoatomic liquid molecule.
41
............ molecule is composed of two atoms of two different elements.
42
The attraction force between water molecules is............. that between water vapor molecules.
43
On heating a solid substance............
44
All of the following are diatomic gaseous molecules except..........
45
The density of a substance whose mass is 15 gm and occupies 30 cm³ is........... the density of water.
46
Metals are characterized by their.........
47
The metal used to cover other substances which rapidly rust is..........
48
.......... Used for fast cooking
49
The colour property is a distinguishing factor between..........
50
The density of a substance is a........... property.