1
CIDESCO EXAM PREPARATION
NEWEST VERSION 2025 – COMPLETE
THEORY QUESTION BANK WITH
QUESTION AND CORRECT ANSWERS
I Biological and non-biological substances both need oxygen for their existence. II
The human body consists only of biological substances. - (answers)I is correct and
II is incorrect
Characteristics of life include: - (answers)growth and metabolism
Examples of synthetic substances are: - (answers)plastics and silicones
Examples of organic biological substances are: - (answers)carbohydrates and fats
Examples of mineral substances are: - (answers)paraffins and petroleum
Matter is everything that: - (answers)occupies space and has weight
The three forms of matter are solids, liquids and: - (answers)gases
What property does all matter have? - (answers)All matter has weight
Condensation is the change of matter from: - (answers)a gas to a liquid
,2
Vapourisation is the change of matter from: - (answers)liquid to a gas
Melting is the change of matter from: - (answers)a solid to a liquid
Sublimation is the change of matter from: - (answers)a solid to a gas
Condensation is: - (answers)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: - (answers)physical change
The immediate change of a solid into a vapour is called: - (answers)sublimation
An example of a single-celled cellular organism is: - (answers)a bacterium
I. A micro-organism is the smallest part of the human body. II All micro-organisms
need nutrients for their existence. - (answers)I is incorrect and II is correct
Examples of bacteria are: - (answers)bacilli and cocci
,3
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. - (answers)I is
correct and II is incorrect
Science deals mainly with: - (answers)physics and chemistry
The study of the structure of the body is called: - (answers)anatomy
The study of the functions of living organisms is: - (answers)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. - (answers)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. - (answers)I and II are both
correct
Which one of the following belongs to the science of chemistry? - (answers)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. - (answers)I is
incorrect and II is correct
, 4
The field of physics includes: - (answers)heat and electricity
Which one of the following belongs to the field of physics? - (answers)Sound,
electricity and heat
The field of physics includes: - (answers)the science of electricity
An anion is: - (answers)A negatively charged atom
An anion is: - (answers)a negatively charged chloride atom (CI-)
A cation is: - (answers)A positively charged sodium atom (Na+)
An electrolyte is: - (answers)A substance which, dissolved in water, splits into ions
Examples of electrolytes are: - (answers)acids and salts
An example of an electrolyte is: - (answers)salt-solution
An acid is an electrolyte because: - (answers)it can conduct an electric current
An example of an inorganic acid is: - (answers)sulphuric acid
CIDESCO EXAM PREPARATION
NEWEST VERSION 2025 – COMPLETE
THEORY QUESTION BANK WITH
QUESTION AND CORRECT ANSWERS
I Biological and non-biological substances both need oxygen for their existence. II
The human body consists only of biological substances. - (answers)I is correct and
II is incorrect
Characteristics of life include: - (answers)growth and metabolism
Examples of synthetic substances are: - (answers)plastics and silicones
Examples of organic biological substances are: - (answers)carbohydrates and fats
Examples of mineral substances are: - (answers)paraffins and petroleum
Matter is everything that: - (answers)occupies space and has weight
The three forms of matter are solids, liquids and: - (answers)gases
What property does all matter have? - (answers)All matter has weight
Condensation is the change of matter from: - (answers)a gas to a liquid
,2
Vapourisation is the change of matter from: - (answers)liquid to a gas
Melting is the change of matter from: - (answers)a solid to a liquid
Sublimation is the change of matter from: - (answers)a solid to a gas
Condensation is: - (answers)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: - (answers)physical change
The immediate change of a solid into a vapour is called: - (answers)sublimation
An example of a single-celled cellular organism is: - (answers)a bacterium
I. A micro-organism is the smallest part of the human body. II All micro-organisms
need nutrients for their existence. - (answers)I is incorrect and II is correct
Examples of bacteria are: - (answers)bacilli and cocci
,3
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. - (answers)I is
correct and II is incorrect
Science deals mainly with: - (answers)physics and chemistry
The study of the structure of the body is called: - (answers)anatomy
The study of the functions of living organisms is: - (answers)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. - (answers)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. - (answers)I and II are both
correct
Which one of the following belongs to the science of chemistry? - (answers)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. - (answers)I is
incorrect and II is correct
, 4
The field of physics includes: - (answers)heat and electricity
Which one of the following belongs to the field of physics? - (answers)Sound,
electricity and heat
The field of physics includes: - (answers)the science of electricity
An anion is: - (answers)A negatively charged atom
An anion is: - (answers)a negatively charged chloride atom (CI-)
A cation is: - (answers)A positively charged sodium atom (Na+)
An electrolyte is: - (answers)A substance which, dissolved in water, splits into ions
Examples of electrolytes are: - (answers)acids and salts
An example of an electrolyte is: - (answers)salt-solution
An acid is an electrolyte because: - (answers)it can conduct an electric current
An example of an inorganic acid is: - (answers)sulphuric acid
