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..........
two oxygen atoms and one hydrogen atom.
one oxygen atom and one hydrogen atom.
two oxygen atoms and two hydrogen atoms.
one oxygen atom and two hydrogen atoms.
2
In a water molecule, oxygen atom combines with two hydrogen atoms by two bonds.
single covalent
hydrogen
ionic
double covalent
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.
hydrogen
covalent
ionic
metallic
5
Water exists in........... in normal temperatures.
solid state only
liquid state only
gaseous state only
All answers are correct
6
Water can dissolve.........
sugar.
oil.
table salt.
table salt and sugar.
7
The high boiling point of water is due to the presence of .......... bonds.
double covalent
ionic
single covalent
hydrogen
8
The snow crystal has.......... shape
pentagonal
hexagonal
quadrilateral
octagonal
9
Ice crystals are characterized by all the following except they have..........
hexagonal shape.
high density.
low density.
large volume.
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 and its density decreases.
its density becomes less than its volume.
its density increases and its volume decreases.
its volume increases without a change in the density.
11
The density of pure water in a solid state is...........
less than its density in vapour state.
less than its density in liquid state.
greater than its density in liquid state.
equal to its density in vapour state.
12
The pure water boils at.......... °C.
20
0
50
100
13
Water has a/an.......... effect on litmus paper.
neutral
acidic
alkaline
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.
its volume increases by freezing.
it is a polar compound.
15
A liquid boils at 100°C. What is the other property, which confirms that it is pure water?............
It has a neutral effect on litmus paper.
Its density decreases on freezing.
It dissolves table sugar.
It evaporates on heating.
16
The electrolysis of acidified water gives hydrogen gas and oxygen gas at a ratio of........... by volume.
2:1
1:2
1:3
2:3
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.
80
20
10
40
18
The volume of hydrogen gas evolving from water electrolysis equals........... the oxygen volume
four times
double
half
that of
19
All the following are natural water pollutants except..........
lightning accompanying thunder storms.
discharge of factories residues.
volcanic eruptions.
death of living organisms.
20
Mixing animals and human wastes with water causes........... pollution.
ehemical
biological
radiant
thermal
21
All the following diseases are caused by biological pollution except.......... disease.
bilharzia
cancer
hepatitis
typhoid
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 ?.........
1
4
2
3
23
Increasing the concentration of ........... in drinking water causes blindness.
mercury
chlorine
arsenic
lead
24
Arsenic increases the infection rate by.........
brain cancer.
hepatitis.
liver cancer.
typhoid.
25
........... pollution causes the death of marine creatures due to the separation of the dissolved oxygen from water.
Biological
Thermal
Radiant
Chemical
26
Which of the following behaviours causes radiant pollution ?..........
Using water in cooling the nuclear reactors.
Discharging of sewage in seas.
No correct answer
Leakage of radioactive materials from nuclear reactor.
×
بلاغ عن خطأ
مقدم البلاغ
طالب
معلم
السؤال
تفاصيل الخطأ
إرسال
إلغاء
×
مشاركة
#
#
نسخ الرابط
