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Unit 1 - Lesson 4 : Water
Unit 1 - Lesson 4 : Water
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1
Water molecule is composed of..........
two oxygen atoms and two hydrogen atoms.
one oxygen atom and two hydrogen atoms.
two oxygen atoms and one hydrogen atom.
one oxygen atom and one hydrogen atom.
2
In a water molecule, oxygen atom combines with two hydrogen atoms by two bonds.
double covalent
hydrogen
ionic
single covalent
3
In a water molecule, the angle between the two hydrogen atoms is.........
64°
104.5°
104
140.5°
4
There are.......... bonds among the water molecules.
hydrogen
covalent
ionic
metallic
5
Water exists in........... in normal temperatures.
All answers are correct
solid state only
gaseous state only
liquid state only
6
Water can dissolve.........
oil.
sugar.
table salt and sugar.
table salt.
7
The high boiling point of water is due to the presence of .......... bonds.
single covalent
hydrogen
ionic
double covalent
8
The snow crystal has.......... shape
octagonal
pentagonal
quadrilateral
hexagonal
9
Ice crystals are characterized by all the following except they have..........
low density.
hexagonal shape.
large volume.
high density.
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 increases and its volume decreases.
its density becomes less than its volume.
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.
greater than its density in liquid state.
equal to its density in vapour state.
less than its density in liquid state.
12
The pure water boils at.......... °C.
20
50
100
0
13
Water has a/an.......... effect on litmus paper.
neutral
basic
acidic
alkaline
14
All the following are among the properties of water except............
it has neutral effect on litmus paper.
it decomposes by heat into its elements.
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.
Its density decreases on freezing.
It dissolves table sugar.
16
The electrolysis of acidified water gives hydrogen gas and oxygen gas at a ratio of........... by volume.
2:3
1:2
2:1
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.
80
10
20
40
18
The volume of hydrogen gas evolving from water electrolysis equals........... the oxygen volume
that of
four times
half
double
19
All the following are natural water pollutants except..........
discharge of factories residues.
volcanic eruptions.
lightning accompanying thunder storms.
death of living organisms.
20
Mixing animals and human wastes with water causes........... pollution.
biological
ehemical
thermal
radiant
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 ?.........
4
1
2
3
23
Increasing the concentration of ........... in drinking water causes blindness.
arsenic
mercury
chlorine
lead
24
Arsenic increases the infection rate by.........
brain cancer.
typhoid.
hepatitis.
liver cancer.
25
........... pollution causes the death of marine creatures due to the separation of the dissolved oxygen from water.
Thermal
Chemical
Biological
Radiant
26
Which of the following behaviours causes radiant pollution ?..........
Leakage of radioactive materials from nuclear reactor.
Using water in cooling the nuclear reactors.
Discharging of sewage in seas.
No correct answer
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