CIDESCO Exam Prep UPDATED ACTUAL
Exam Questions and CORRECT Answers
I Biological and non-biological substances both need oxygen for their existence. II The human
body consists only of biological substances. - CORRECT ANSWER - I is correct and II is
incorrect
Characteristics of life include: - CORRECT ANSWER - growth and metabolism
Examples of synthetic substances are: - CORRECT ANSWER - plastics and silicones
Examples of organic biological substances are: - CORRECT ANSWER - carbohydrates
and fats
Examples of mineral substances are: - CORRECT ANSWER - paraffins and petroleum
Matter is everything that: - CORRECT ANSWER - occupies space and has weight
The three forms of matter are solids, liquids and: - CORRECT ANSWER - gases
What property does all matter have? - CORRECT ANSWER - All matter has weight
Condensation is the change of matter from: - CORRECT ANSWER - a gas to a liquid
Vapourisation is the change of matter from: - CORRECT ANSWER - liquid to a gas
Melting is the change of matter from: - CORRECT ANSWER - a solid to a liquid
,Sublimation is the change of matter from: - CORRECT ANSWER - a solid to a gas
Condensation is: - CORRECT ANSWER - 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: - CORRECT ANSWER - physical change
The immediate change of a solid into a vapour is called: - CORRECT ANSWER -
sublimation
An example of a single-celled cellular organism is: - CORRECT ANSWER - a bacterium
I. A micro-organism is the smallest part of the human body. II All micro-organisms need
nutrients for their existence. - CORRECT ANSWER - I is incorrect and II is correct
Examples of bacteria are: - CORRECT ANSWER - 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. - CORRECT ANSWER - I is
correct and II is incorrect
Science deals mainly with: - CORRECT ANSWER - physics and chemistry
The study of the structure of the body is called: - CORRECT ANSWER - anatomy
The study of the functions of living organisms is: - CORRECT ANSWER - 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. - CORRECT ANSWER - 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. - CORRECT ANSWER - I and II are both
correct
Which one of the following belongs to the science of chemistry? - CORRECT ANSWER -
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. - CORRECT ANSWER - I is incorrect and II
is correct
The field of physics includes: - CORRECT ANSWER - heat and electricity
Which one of the following belongs to the field of physics? - CORRECT ANSWER -
Sound, electricity and heat
The field of physics includes: - CORRECT ANSWER - the science of electricity
An anion is: - CORRECT ANSWER - A negatively charged atom
An anion is: - CORRECT ANSWER - a negatively charged chloride atom (CI-)
A cation is: - CORRECT ANSWER - A positively charged sodium atom (Na+)
An electrolyte is: - CORRECT ANSWER - A substance which, dissolved in water, splits
into ions
, Examples of electrolytes are: - CORRECT ANSWER - acids and salts
An example of an electrolyte is: - CORRECT ANSWER - salt-solution
An acid is an electrolyte because: - CORRECT ANSWER - it can conduct an electric
current
An example of an inorganic acid is: - CORRECT ANSWER - sulphuric acid
An alkali must contain: - CORRECT ANSWER - metal atoms and hydroxyl group(s)
(OH)
An example of an alkaline substance is: - CORRECT ANSWER - soap
If a metal-oxide is dissolved in water it forms: - CORRECT ANSWER - an alkali
The pH scale is used to measure the degree of acidity or: - CORRECT ANSWER -
alkalinity
pH can be decreased by: - CORRECT ANSWER - increasing hydrogen-ions
The letter p in pH means: - CORRECT ANSWER - potential
pH is: - CORRECT ANSWER - the number of free H-ions in solution
If the pH of a solution is between 5 and 7, the solution is a: - CORRECT ANSWER - weak
acid
Exam Questions and CORRECT Answers
I Biological and non-biological substances both need oxygen for their existence. II The human
body consists only of biological substances. - CORRECT ANSWER - I is correct and II is
incorrect
Characteristics of life include: - CORRECT ANSWER - growth and metabolism
Examples of synthetic substances are: - CORRECT ANSWER - plastics and silicones
Examples of organic biological substances are: - CORRECT ANSWER - carbohydrates
and fats
Examples of mineral substances are: - CORRECT ANSWER - paraffins and petroleum
Matter is everything that: - CORRECT ANSWER - occupies space and has weight
The three forms of matter are solids, liquids and: - CORRECT ANSWER - gases
What property does all matter have? - CORRECT ANSWER - All matter has weight
Condensation is the change of matter from: - CORRECT ANSWER - a gas to a liquid
Vapourisation is the change of matter from: - CORRECT ANSWER - liquid to a gas
Melting is the change of matter from: - CORRECT ANSWER - a solid to a liquid
,Sublimation is the change of matter from: - CORRECT ANSWER - a solid to a gas
Condensation is: - CORRECT ANSWER - 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: - CORRECT ANSWER - physical change
The immediate change of a solid into a vapour is called: - CORRECT ANSWER -
sublimation
An example of a single-celled cellular organism is: - CORRECT ANSWER - a bacterium
I. A micro-organism is the smallest part of the human body. II All micro-organisms need
nutrients for their existence. - CORRECT ANSWER - I is incorrect and II is correct
Examples of bacteria are: - CORRECT ANSWER - 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. - CORRECT ANSWER - I is
correct and II is incorrect
Science deals mainly with: - CORRECT ANSWER - physics and chemistry
The study of the structure of the body is called: - CORRECT ANSWER - anatomy
The study of the functions of living organisms is: - CORRECT ANSWER - 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. - CORRECT ANSWER - 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. - CORRECT ANSWER - I and II are both
correct
Which one of the following belongs to the science of chemistry? - CORRECT ANSWER -
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. - CORRECT ANSWER - I is incorrect and II
is correct
The field of physics includes: - CORRECT ANSWER - heat and electricity
Which one of the following belongs to the field of physics? - CORRECT ANSWER -
Sound, electricity and heat
The field of physics includes: - CORRECT ANSWER - the science of electricity
An anion is: - CORRECT ANSWER - A negatively charged atom
An anion is: - CORRECT ANSWER - a negatively charged chloride atom (CI-)
A cation is: - CORRECT ANSWER - A positively charged sodium atom (Na+)
An electrolyte is: - CORRECT ANSWER - A substance which, dissolved in water, splits
into ions
, Examples of electrolytes are: - CORRECT ANSWER - acids and salts
An example of an electrolyte is: - CORRECT ANSWER - salt-solution
An acid is an electrolyte because: - CORRECT ANSWER - it can conduct an electric
current
An example of an inorganic acid is: - CORRECT ANSWER - sulphuric acid
An alkali must contain: - CORRECT ANSWER - metal atoms and hydroxyl group(s)
(OH)
An example of an alkaline substance is: - CORRECT ANSWER - soap
If a metal-oxide is dissolved in water it forms: - CORRECT ANSWER - an alkali
The pH scale is used to measure the degree of acidity or: - CORRECT ANSWER -
alkalinity
pH can be decreased by: - CORRECT ANSWER - increasing hydrogen-ions
The letter p in pH means: - CORRECT ANSWER - potential
pH is: - CORRECT ANSWER - the number of free H-ions in solution
If the pH of a solution is between 5 and 7, the solution is a: - CORRECT ANSWER - weak
acid
