Toggle navigation
التسجيل
تسجيل الدخول
الرئيسية
»
الاختبارات
»
الترم الأول
»
Unit 1 : preparatory stage - year 1
Unit 1 : preparatory stage - year 1
نسخ
تكرار
1
The colour property is a distinguishing factor between..........
table salt and flour.
oxygen and nitrogen.
iron and gold.
oxygen and carbon dioxide.
2
The motion of solid molecules is..........
the most.
limited.
completely free.
unlimited.
3
The chemical symbol of nitrogen atom is..........
Ne
N
No
Na
4
The smell property is a distinguishing factor between...........
iron and copper.
silver and iron.
wood and plastic.
vinegar and perfume.
5
The liquid matter is characterized by all of the following except..........
the intermolecular force among its molecules is very small.
the intermolecular distances among its molecules are intermediate.
it takes the shape of the container.
the motion of its molecules is more free.
6
The atom nucleus contains..........
protons and electrons.
protons, neutrons and electrons.
neutrons and electrons.
protons and neutrons.
7
The volume of liquid is calculated from the relation..........
mass ÷ density
mass × density
mass + density
density ÷ mass
8
The attraction force between water molecules is............. that between water vapor molecules.
no correct answer
equal to
more than
less than
9
The sum of the numbers of protons and neutrons in the nucleus of the atom is known as.........
density.
atomic number.
valency.
mass number.
10
The density of a substance whose mass is 15 gm and occupies 30 cm³ is........... the density of water.
more than
no correct answer
less than
equal to
11
On heating a liquid substance, an..........
the attraction force among its molecules decreases.
the intermolecular spaces among its molecules increase.
all of the previous answers.
the speed of its molecules increases.
12
The atomic number of an element having 6 protons in its nucleus is............
6
11
27
12
13
When a substance sinks in water, this means that its density is......... the density of water.
no correct answer
less than
more than
equal to
14
It is a substance which is formed from the combination of atoms of two or more different elements with constant weight ratios.
no correct answer.
The compound.
an atom.
The element.
a molecule.
15
Negative charged particles of negligible mass are..........
protons.
all of the previous answers.
neutrons.
electrons.
16
The density of petroleum oil is.......... that of water.
equal to
no correct answer
less than
more than
17
........... is the monoatomic liquid molecule.
Bromine
Chlorine
Mercury
lodine
18
The energy of the electron is........... the energy of the level which it revolves in.
less than
more than
equal to
no correct answer
19
Heating coils are made up of.......... alloy.
nickel-chrome
iron-copper
chrome-copper
nickel-iron
20
Water molecule is composed of........
one hydrogen atom and two oxygen atoms.
one oxygen atom and two hydrogen atoms.
one hydrogen atom and two nitrogen atoms.
two hydrogen atoms and two oxygen atoms.
21
The rule 2n² cannot be applied to the energy level...........
L
O
M
K
22
All of the following substances conduct electricity except..........
aluminum.
wood.
iron.
copper.
23
The number of elements is equal to the number of atoms in......... molecule.
ammonia
oxygen
water
hydrogen chloride
24
The electrons of potassium atom (K) has (19 proton) are distributed in......... energy level(s).
4
2
3
1
25
All of the following solutions conduct electricity except.......... solution.
alkaline
acidic
salt
sugary
26
One gram of....... contains one type of atoms.
Ammonia
iron.
water
hydrogen chloride
27
The properties of.......... of water is the same properties of 100 ml of it.
a molecule
an atom
an element
an ion
28
The taste property is a distinguishing factor between..........
milk and honey.
silver and gold.
wood and plastic.
oxygen and nitrogen.
29
The intermolecular spaces among the molecules of........... are very small.
iron
nitrogen
mercury
water
30
Silver is symbolized by............
Hg
Ag
Au
Cu
31
Density of matter =.............
Mass + Volume
Mass x Volume
Mass ÷ Volume
Volume ÷ Mass
32
The attraction force among solid molecules is..............
very small.
small.
large.
no correct answer.
33
The atomic number of the atom of an element equals the...........
number of neutrons in the nucleus.
number of electrons in the nucleus.
number of protons revolving around the nucleus.
number of protons in the nucleus.
34
The mass of water in gm is always....... its volume in cm³ (knowing that the density of water is 1 gm/cm³).
double
equal to
more than
less than
35
On heating a solid substance............
all of the previous answers.
the attraction force among its molecules decreases.
the speed of its molecules increases.
the intermolecular spaces among its molecules increase.
36
The mass number of an atom having 13 electrons and 14 neutrons equals...........
12
34
27
13
37
........... is from the substances that float on water surface.
Iron
Copper
Cork
Aluminum
38
It is the simplest pure form of matter which can't be analyzed chemically into simpler form by simple chemical methods.
The compound.
a molecule.
The element.
an atom.
39
The balloons that are filled with helium gas in celebrations, rise up in air. because..........
density of helium is less than that of air.
no correct answer.
density of helium equals that of air.
density of helium is more than that of air.
40
The intermolecular force among the molecules of water is...........
large.
no correct answer.
small.
medium.
41
The energy of the excited atom is.......... the energy of the atom in its ground state.
less than
equal to
more than
no correct answer
42
.......... Used for fast cooking
Electric wires
Hearing coil
Electric screwdrivers
Pressure pans
43
The molecule of oxygen is composed of.......... atom(s).
one
two
three
Four
44
The third energy level is saturated with........... electrons.
8
2
18
32
45
Metals are characterized by their.........
conductivity of heat.
conductivity of electricity.
all of the previous answers.
high melting point.
46
Which one of the following molecules contains the largest number of atoms?...........
Water
Bromine
Hydrogen chloride
Ammonia
47
The atomic number of an element has 2 electrons in "L" level is
8
6
4
2
48
Among elements which has a great difficulty to react with oxygen of air is............
aluminum.
potassium.
sodium.
chromium.
49
The symbol of copper atom is...........
Ca
Co
C
Cu
50
The property of electric conduction is a distinguishing factor between..........
iron and wood.
no correct answer.
iron and copper.
wood and plastic.
×
بلاغ عن خطأ
مقدم البلاغ
طالب
معلم
السؤال
تفاصيل الخطأ
إرسال
إلغاء
×
مشاركة
#
#
نسخ الرابط