CIDESCO 2025-2026 Exam Prep With
Correct Verified Answers Graded A+
I Biological and non-biological substances both need
oxygen for their existence. II The human body
consists only of biological substances.
I is correct and II is incorrect
Characteristics of life include:
growth and metabolism
Examples of synthetic substances are:
plastics and silicones
Examples of organic biological substances are:
carbohydrates and fats
Examples of mineral substances are:
paraffins and petroleum
Matter is everything that:
occupies space and has weight
The three forms of matter are solids, liquids and:
gases
What property does all matter have?
All matter has weight
Condensation is the change of matter from:
a gas to a liquid
Vapourisation is the change of matter from:
liquid to a gas
Melting is the change of matter from:
a solid to a liquid
Sublimation is the change of matter from:
a solid to a gas
,Condensation is:
the change of a vapour to a liquid
The alteration of the properties of matter without the
formation of any new substance is called a/an:
physical change
The immediate change of a solid into a vapour is
called:
sublimation
An example of a single-celled cellular organism is:
a bacterium
I. A micro-organism is the smallest part of the human
body. II All micro-organisms need nutrients for their
existence.
I is incorrect and II is correct
Examples of bacteria are:
bacilli and cocci
I. Every living organism needs some non-biological
substances for it's existence. II. All non-biological
substances are found as minerals in the earth.
I is correct and II is incorrect
Science deals mainly with:
physics and chemistry
The study of the structure of the body is called:
anatomy
The study of the functions of living organisms is:
physiology
I Anatomy is a very important science in the field of
biology. II Anatomy is the science which deals with
the functions of the human body.
I is correct and II is incorrect
,I Physiology is a very important science in the field of
biology. II Physiology is the science which deals with
the functions of the body.
I and II are both correct
Which one of the following belongs to the science of
chemistry?
The alteration of the structure of molecules
I Chemical reactions only take place outside and not
inside a living organism. II The structure of molecules
change during chemical reactions.
I is incorrect and II is correct
The field of physics includes:
heat and electricity
Which one of the following belongs to the field of
physics?
Sound, electricity and heat
The field of physics includes:
the science of electricity
An anion is:
A negatively charged atom
An anion is:
a negatively charged chloride atom (CI-)
A cation is:
A positively charged sodium atom (Na+)
An electrolyte is:
A substance which, dissolved in water, splits into ions
Examples of electrolytes are:
acids and salts
An example of an electrolyte is:
salt-solution
An acid is an electrolyte because:
, it can conduct an electric current
An example of an inorganic acid is:
sulphuric acid
An alkali must contain:
metal atoms and hydroxyl group(s) (OH)
An example of an alkaline substance is:
soap
If a metal-oxide is dissolved in water it forms:
an alkali
The pH scale is used to measure the degree of acidity
or:
alkalinity
pH can be decreased by:
increasing hydrogen-ions
The letter p in pH means:
potential
pH is:
the number of free H-ions in solution
If the pH of a solution is between 5 and 7, the solution
is a:
weak acid
If the pH of a solution is between 1 and 3 the solution
is a:
strong acid
If the pH of a solution is between 7 and 9 the solution
is a:
weak alkali
If the pH of a solution is between 12 and 14 the
solution is:
strong alkali
The pH of distilled water is:
Correct Verified Answers Graded A+
I Biological and non-biological substances both need
oxygen for their existence. II The human body
consists only of biological substances.
I is correct and II is incorrect
Characteristics of life include:
growth and metabolism
Examples of synthetic substances are:
plastics and silicones
Examples of organic biological substances are:
carbohydrates and fats
Examples of mineral substances are:
paraffins and petroleum
Matter is everything that:
occupies space and has weight
The three forms of matter are solids, liquids and:
gases
What property does all matter have?
All matter has weight
Condensation is the change of matter from:
a gas to a liquid
Vapourisation is the change of matter from:
liquid to a gas
Melting is the change of matter from:
a solid to a liquid
Sublimation is the change of matter from:
a solid to a gas
,Condensation is:
the change of a vapour to a liquid
The alteration of the properties of matter without the
formation of any new substance is called a/an:
physical change
The immediate change of a solid into a vapour is
called:
sublimation
An example of a single-celled cellular organism is:
a bacterium
I. A micro-organism is the smallest part of the human
body. II All micro-organisms need nutrients for their
existence.
I is incorrect and II is correct
Examples of bacteria are:
bacilli and cocci
I. Every living organism needs some non-biological
substances for it's existence. II. All non-biological
substances are found as minerals in the earth.
I is correct and II is incorrect
Science deals mainly with:
physics and chemistry
The study of the structure of the body is called:
anatomy
The study of the functions of living organisms is:
physiology
I Anatomy is a very important science in the field of
biology. II Anatomy is the science which deals with
the functions of the human body.
I is correct and II is incorrect
,I Physiology is a very important science in the field of
biology. II Physiology is the science which deals with
the functions of the body.
I and II are both correct
Which one of the following belongs to the science of
chemistry?
The alteration of the structure of molecules
I Chemical reactions only take place outside and not
inside a living organism. II The structure of molecules
change during chemical reactions.
I is incorrect and II is correct
The field of physics includes:
heat and electricity
Which one of the following belongs to the field of
physics?
Sound, electricity and heat
The field of physics includes:
the science of electricity
An anion is:
A negatively charged atom
An anion is:
a negatively charged chloride atom (CI-)
A cation is:
A positively charged sodium atom (Na+)
An electrolyte is:
A substance which, dissolved in water, splits into ions
Examples of electrolytes are:
acids and salts
An example of an electrolyte is:
salt-solution
An acid is an electrolyte because:
, it can conduct an electric current
An example of an inorganic acid is:
sulphuric acid
An alkali must contain:
metal atoms and hydroxyl group(s) (OH)
An example of an alkaline substance is:
soap
If a metal-oxide is dissolved in water it forms:
an alkali
The pH scale is used to measure the degree of acidity
or:
alkalinity
pH can be decreased by:
increasing hydrogen-ions
The letter p in pH means:
potential
pH is:
the number of free H-ions in solution
If the pH of a solution is between 5 and 7, the solution
is a:
weak acid
If the pH of a solution is between 1 and 3 the solution
is a:
strong acid
If the pH of a solution is between 7 and 9 the solution
is a:
weak alkali
If the pH of a solution is between 12 and 14 the
solution is:
strong alkali
The pH of distilled water is:
