Toggle navigation
التسجيل
تسجيل الدخول
الرئيسية
»
الاختبارات
»
الترم الأول
»
Unit 1 - Lesson 4 : Water
Unit 1 - Lesson 4 : Water
نسخ
تكرار
1
Water molecule is composed of..........
one oxygen atom and one hydrogen atom.
one oxygen atom and two hydrogen atoms.
two oxygen atoms and one hydrogen atom.
two oxygen atoms and two hydrogen atoms.
2
In a water molecule, oxygen atom combines with two hydrogen atoms by two bonds.
double covalent
single covalent
hydrogen
ionic
3
In a water molecule, the angle between the two hydrogen atoms is.........
140.5°
64°
104.5°
104
4
There are.......... bonds among the water molecules.
ionic
metallic
hydrogen
covalent
5
Water exists in........... in normal temperatures.
All answers are correct
gaseous state only
liquid state only
solid state only
6
Water can dissolve.........
table salt.
oil.
table salt and sugar.
sugar.
7
The high boiling point of water is due to the presence of .......... bonds.
double covalent
single covalent
ionic
hydrogen
8
The snow crystal has.......... shape
hexagonal
pentagonal
octagonal
quadrilateral
9
Ice crystals are characterized by all the following except they have..........
high density.
large volume.
low density.
hexagonal shape.
10
A bottle is filled completely with water and put closed in the freezer. After sometime it breaks, because when water freezes............
its volume increases without a change in the density.
its density becomes less than its volume.
its density increases and its volume decreases.
its volume increases and its density decreases.
11
The density of pure water in a solid state is...........
less than its density in liquid state.
greater than its density in liquid state.
equal to its density in vapour state.
less than its density in vapour state.
12
The pure water boils at.......... °C.
0
20
100
50
13
Water has a/an.......... effect on litmus paper.
alkaline
acidic
neutral
basic
14
All the following are among the properties of water except............
it decomposes by heat into its elements.
it has neutral effect on litmus paper.
it is a polar compound.
its volume increases by freezing.
15
A liquid boils at 100°C. What is the other property, which confirms that it is pure water?............
It evaporates on heating.
It has a neutral effect on litmus paper.
It dissolves table sugar.
Its density decreases on freezing.
16
The electrolysis of acidified water gives hydrogen gas and oxygen gas at a ratio of........... by volume.
1:2
2:1
2:3
1:3
17
In the electrolysis of acidified water by using "Hofmann's voltameter", the volume of hydrogen gas that evolves is (40 cm³), so the volume of oxygen gas that evolves is ...... cm³.
10
40
20
80
18
The volume of hydrogen gas evolving from water electrolysis equals........... the oxygen volume
four times
that of
half
double
19
All the following are natural water pollutants except..........
volcanic eruptions.
lightning accompanying thunder storms.
discharge of factories residues.
death of living organisms.
20
Mixing animals and human wastes with water causes........... pollution.
thermal
radiant
ehemical
biological
21
All the following diseases are caused by biological pollution except.......... disease.
typhoid
cancer
bilharzia
hepatitis
22
The water of a pool contains minerals, oxygen, organic fertilizer, animals wastes and green algae. What is the number of pollutants found in it ?.........
3
1
2
4
23
Increasing the concentration of ........... in drinking water causes blindness.
mercury
lead
arsenic
chlorine
24
Arsenic increases the infection rate by.........
liver cancer.
brain cancer.
hepatitis.
typhoid.
25
........... pollution causes the death of marine creatures due to the separation of the dissolved oxygen from water.
Biological
Radiant
Chemical
Thermal
26
Which of the following behaviours causes radiant pollution ?..........
No correct answer
Discharging of sewage in seas.
Using water in cooling the nuclear reactors.
Leakage of radioactive materials from nuclear reactor.
×
بلاغ عن خطأ
مقدم البلاغ
طالب
معلم
السؤال
تفاصيل الخطأ
إرسال
إلغاء
×
مشاركة
#
#
نسخ الرابط
